CVE-2026-23111
published 2026-02-13CVE-2026-23111: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()…
PriorityP343high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.34%
26.7th percentile
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inactive
elements and processes active ones.
Compare the non-catchall activate callback, which is correct:
nft_mapelem_activate():
if (nft_set_elem_active(ext, iter->genmask))
return 0; /* skip active, process inactive */
With the buggy catchall version:
nft_map_catchall_activate():
if (!nft_set_elem_active(ext, genmask))
continue; /* skip inactive, process active */
The consequence is that when a DELSET operation is aborted,
nft_setelem_data_activate() is never called for the catchall element.
For NFT_GOTO verdict elements, this means nft_data_hold() is never
called to restore the chain->use reference count. Each abort cycle
permanently decrements chain->use. Once chain->use reaches zero,
DELCHAIN succeeds and frees the chain while catchall verdict elements
still reference it, resulting in a use-after-free.
This is exploitable for local privilege escalation from an unprivileged
user via user namespaces + nftables on distributions that enable
CONFIG_USER_NS and CONFIG_NF_TABLES.
Fix by removing the negation so the check matches nft_mapelem_activate():
skip active elements, process inactive ones.
Affected
47 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.164-1 (bookworm) | linux 6.1.164-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.164-1 (bookworm) | linux 6.1.164-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 25aa2ad37c2162be1c0bc4fe6397f7e4c13f00f8 < 8c760ba4e36c750379d13569f23f5a6e185333f5 | 8c760ba4e36c750379d13569f23f5a6e185333f5 |
| linux | linux | >= 4.19.316 < 4.20 | 4.20 |
| linux | linux | >= 5.10.188 < 5.11 | 5.11 |
| linux | linux | >= 5.15.121 < 5.15.200 | 5.15.200 |
| linux | linux | >= 5.4.262 < 5.5 | 5.5 |
| linux | linux | >= 6.1.36 < 6.1.163 | 6.1.163 |
| linux | linux | >= 6.3.10 < 6.4 | 6.4 |
| linux | linux | >= 628bd3e49cba1c066228e23d71a852c23e26da73 < 42c574c1504aa089a0a142e4c13859327570473d | 42c574c1504aa089a0a142e4c13859327570473d |
| linux | linux | >= 628bd3e49cba1c066228e23d71a852c23e26da73 < 1444ff890b4653add12f734ffeffc173d42862dd | 1444ff890b4653add12f734ffeffc173d42862dd |
| linux | linux | >= 628bd3e49cba1c066228e23d71a852c23e26da73 < 8b68a45f9722f2babe9e7bad00aa74638addf081 | 8b68a45f9722f2babe9e7bad00aa74638addf081 |
| linux | linux | >= 628bd3e49cba1c066228e23d71a852c23e26da73 < f41c5d151078c5348271ffaf8e7410d96f2d82f8 | f41c5d151078c5348271ffaf8e7410d96f2d82f8 |
| linux | linux | >= d60be2da67d172aecf866302c91ea11533eca4d9 < b9b6573421de51829f7ec1cce76d85f5f6fbbd7f | b9b6573421de51829f7ec1cce76d85f5f6fbbd7f |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu7.8HIGH
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Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-ge
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Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
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(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
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causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407,
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use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407,
CVE-2026-23408, CVE-2026-23409, CVE-2026-23410, CVE-2026-23411)
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Qualys discovered that several vulnerabilities existed in the AppArmor
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use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407,
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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- Block layer subsystem;
- Cryptographic API;
- Drivers core;
- Bluetooth drivers;
- DMA engine subsystem;
- GPU drivers;
- HID subsystem;
- Intel Trace Hub HW tracing drivers;
- IIO ADC drivers;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- UACCE accelerator framework;
- Ethernet bonding driver;
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- STMicroelectronics network drivers;
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- NVME drivers;
- PHY drivers;
- SLIMbus drivers;
- W1 Dallas's 1-wire bus driver;
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Ubuntu
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CVE-2026-23074 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, li
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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(CVE-2025-37849, CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kerne
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2025-37849, CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the st
Ubuntu
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CVE-2025-37849 [HIGH] Linux kernel (FIPS) vulnerabilities
Title: Linux kernel (FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2025-37849, CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standar
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CVE-2026-23060 [MEDIUM] Linux kernel (Real-time) vulnerabilities
Title: Linux kernel (Real-time) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux
Ubuntu
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Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD Zen 5 processors supporting RDSEED
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possibly use this issue to influence the values returned by the RDSEED
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Qualys discovered that several vulnerabilities existed in the AppArmor
Linux kernel Security Module (LSM). An unprivileged local attacker could
use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibl
Ubuntu
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CVE-2026-23111 [MEDIUM] Linux kernel (Real-time) vulnerabilities
Title: Linux kernel (Real-time) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux
Ubuntu
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vendor_ubuntu·2026-04-02·CVSS 5.5
CVE-2026-23060 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, li
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-04-02·CVSS 5.5
CVE-2026-23111 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, li
Ubuntu
Linux kernel (FIPS) vulnerabilities
vendor_ubuntu·2026-04-02·CVSS 5.5
CVE-2026-23111 [MEDIUM] Linux kernel (FIPS) vulnerabilities
Title: Linux kernel (FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-gene
Red Hat
kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
vendor_redhat·2026-02-13·CVSS 7.8
CVE-2026-23111 [HIGH] CWE-672 kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inactive
elements and
Debian
CVE-2026-23111: linux - In the Linux kernel, the following vulnerability has been resolved: netfilter: ...
vendor_debian·2026·CVSS 7.8
CVE-2026-23111 [HIGH] CVE-2026-23111: linux - In the Linux kernel, the following vulnerability has been resolved: netfilter: ...
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate():
OSV
linux-oem-6.17 vulnerabilities
osv·2026-04-06·CVSS 7.2
CVE-2025-62626 [HIGH] linux-oem-6.17 vulnerabilities
linux-oem-6.17 vulnerabilities
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacker could
possibly use this issue to influence the values returned by the RDSEED
instruction causing loss of confidentiality and integrity. (CVE-2025-62626)
Qualys discovered that several vulnerabilities existed in the AppArmor
Linux kernel Security Module (LSM). An unprivileged local attacker could
use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026
OSV
linux-realtime-6.17 vulnerabilities
osv·2026-04-06·CVSS 5.5
CVE-2026-23060 [MEDIUM] linux-realtime-6.17 vulnerabilities
linux-realtime-6.17 vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
OSV
linux, linux-aws, linux-aws-6.17, linux-gcp, linux-gcp-6.17, linux-hwe-6.17, linux-realtime vulnerabilities
osv·2026-04-02·CVSS 5.5
CVE-2026-23060 [MEDIUM] linux, linux-aws, linux-aws-6.17, linux-gcp, linux-gcp-6.17, linux-hwe-6.17, linux-realtime vulnerabilities
linux, linux-aws, linux-aws-6.17, linux-gcp, linux-gcp-6.17, linux-hwe-6.17, linux-realtime vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
OSV
linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-lowlatency, linux-nvidia, linux-raspi vulnerabilities
osv·2026-04-02·CVSS 5.5
CVE-2026-23060 [MEDIUM] linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-lowlatency, linux-nvidia, linux-raspi vulnerabilities
linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-lowlatency, linux-nvidia, linux-raspi vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
OSV
linux-realtime, linux-realtime-6.8, linux-raspi-realtime vulnerabilities
osv·2026-04-02·CVSS 5.5
CVE-2026-23060 [MEDIUM] linux-realtime, linux-realtime-6.8, linux-raspi-realtime vulnerabilities
linux-realtime, linux-realtime-6.8, linux-raspi-realtime vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
OSV
linux-fips, linux-aws-fips, linux-gcp-fips vulnerabilities
osv·2026-04-02·CVSS 5.5
CVE-2026-23060 [MEDIUM] linux-fips, linux-aws-fips, linux-gcp-fips vulnerabilities
linux-fips, linux-aws-fips, linux-gcp-fips vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Netfilter;
- Network traffic control;
(CVE-2026-23060, CVE-2026-23074, CVE-2026-23111)
OSV
CVE-2026-23111: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nf
osv·2026-02-13·CVSS 7.8
CVE-2026-23111 [HIGH] CVE-2026-23111: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nf
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate():
GHSA
GHSA-jh9m-9mr6-3ghc: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
ghsa_unreviewed·2026-02-13
CVE-2026-23111 [HIGH] CWE-416 GHSA-jh9m-9mr6-3ghc: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inactive
elements and processes active ones.
Compare the non-catchall activate callback, which is correct:
nft_mapelem_activa
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and More
blogs_hackernews·2026-06-15·CVSS 8.8
CVE-2026-11645 [HIGH] ⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and More
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## ⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and More
Stuff broke again. Not in a movie way. An old tool was left exposed. An abandoned package was abused. A deprecated feature was still running in prod.
This week is the same lesson in a new form: phishing kits are easier to rent, AI names are useful bait, old login paths still fail, and forgotten software keeps becoming someone else's entry point.
Scroll through the full Monday Cybersecurity Recap below for the news, tools, webinars, and fixes worth your time this week.
## ⚡ Threat of the Week
Google Patches Actively Exploited Chrome 0-Day - G
Hackernews
One-Character Linux Kernel Flaw Enables Local Root Access, Exploits Now Public
blogs_hackernews·2026-06-09·CVSS 7.8
CVE-2026-23111 [HIGH] One-Character Linux Kernel Flaw Enables Local Root Access, Exploits Now Public
Home
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## One-Character Linux Kernel Flaw Enables Local Root Access, Exploits Now Public
Security researchers have published a detailed, working exploit for a Linux kernel use-after-free that lets an unprivileged local user escalate to root and break out of a container.
The flaw, CVE-2026-23111, sits in the kernel's nf_tables packet-filtering code and was patched upstream on February 5, 2026. Exodus Intelligence released its full technical walkthrough on June 8, and it is not even the first public exploit: FuzzingLabs published an independent reproduction back in April.
The flaw came down to a single stray character, an inverted chec
Wiz
CVE-2026-23111 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.8
CVE-2026-23111 [HIGH] CVE-2026-23111 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23111 :
Linux Kernel vulnerability analysis and mitigation
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inactive
elements and processes active ones.
Compare
Bugzilla
CVE-2026-23111 kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
bugzilla·2026-02-13·CVSS 7.8
CVE-2026-23111 [HIGH] CVE-2026-23111 kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
CVE-2026-23111 kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inac
https://git.kernel.org/stable/c/1444ff890b4653add12f734ffeffc173d42862ddhttps://git.kernel.org/stable/c/42c574c1504aa089a0a142e4c13859327570473dhttps://git.kernel.org/stable/c/8b68a45f9722f2babe9e7bad00aa74638addf081https://git.kernel.org/stable/c/8c760ba4e36c750379d13569f23f5a6e185333f5https://git.kernel.org/stable/c/b9b6573421de51829f7ec1cce76d85f5f6fbbd7fhttps://git.kernel.org/stable/c/f41c5d151078c5348271ffaf8e7410d96f2d82f8https://access.redhat.com/errata/RHSA-2026:10108https://access.redhat.com/errata/RHSA-2026:10996https://access.redhat.com/errata/RHSA-2026:18134https://access.redhat.com/errata/RHSA-2026:6570https://access.redhat.com/errata/RHSA-2026:9112https://access.redhat.com/security/cve/CVE-2026-23111https://blog.exodusintel.com/2026/06/08/off-by-exploiting-a-use-after-free-in-the-linux-kernel/https://bugzilla.redhat.com/show_bug.cgi?id=2439687https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-253495.htmlhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23111.json
2026-02-13
Published