CVE-2026-43037
published 2026-05-01CVE-2026-43037: In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() Oskar Kjos reported the following problem…
PriorityP355critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.56%
43.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following problem.
ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written
by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes
IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region
as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff
at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr
value. __ip_options_echo() then reads optlen from attacker-controlled
packet data at sptr[rr+1] and copies that many bytes into dopt->__data,
a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).
To fix this we clear skb2->cb[], as suggested by Oskar Kjos.
Also add minimal IPv4 header validation (version == 4, ihl >= 5).
Affected
71 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < ea9f65b27c8404e164848ebff1443310fd187629 | ea9f65b27c8404e164848ebff1443310fd187629 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < d6621f60192fe10c047a4487be42a6f4c150707f | d6621f60192fe10c047a4487be42a6f4c150707f |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < 2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5 | 2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < a0c4ce9900a108eaf55d0f3b399cb55999647d39 | a0c4ce9900a108eaf55d0f3b399cb55999647d39 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < 1063515ce15ff31065c4e7f8265f4c2fd3c54876 | 1063515ce15ff31065c4e7f8265f4c2fd3c54876 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < 590f622669b97eaf7b57a1de7b0a6e68c5d8b2c3 | 590f622669b97eaf7b57a1de7b0a6e68c5d8b2c3 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < 4a622658f384b03560834cbe8ffcfe69a278f7c8 | 4a622658f384b03560834cbe8ffcfe69a278f7c8 |
| linux | linux | >= c4d3efafcc933fd2ffd169d7dc4f980393a13796 < 2edfa31769a4add828a7e604b21cb82aaaa05925 | 2edfa31769a4add828a7e604b21cb82aaaa05925 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 2.6.22 < 5.10.253 | 5.10.253 |
| linux | linux_kernel | >= 5.11 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 5.16 < 6.1.168 | 6.1.168 |
| linux | linux_kernel | >= 6.13 < 6.18.22 | 6.18.22 |
| linux | linux_kernel | >= 6.19 < 6.19.12 | 6.19.12 |
| linux | linux_kernel | >= 6.2 < 6.6.134 | 6.6.134 |
| linux | linux_kernel | >= 6.7 < 6.12.81 | 6.12.81 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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privileges, or possibly escape a container. (CVE-2026-43503)
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An attacker could possibly use these to compromise the system.
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- USB over IP driver;
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RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284)
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503)
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- Cryptographic API;
- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
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- HFS+ file system;
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- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
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- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
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- PowerPC architecture;
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- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
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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;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503)
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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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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- RISC-V architecture;
- Cryptographic API;
- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
- HFS+ file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- IPv6 networking;
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- Timer subsystem;
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Title: Linux kernel (Low Latency) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a conta
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CVE-2026-43314 [HIGH] Linux kernel (Xilinx) vulnerabilities
Title: Linux kernel (Xilinx) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
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Title: Linux kernel (NVIDIA Tegra) 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;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardwar
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 4.7
CVE-2025-68214 [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:
- RISC-V architecture;
- Cryptographic API;
- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
- HFS+ file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- IPv6 networking;
- Tracing infrastructure;
- Timer subsystem;
- B.A.T.M.A.N. meshing protocol;
- Bluetooth subsystem;
- Ethernet bridge;
-
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01
CVE-2026-43226 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:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring dr
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) 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;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshi
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] 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:
- ARM64 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshing protocol;
- Ethernet br
Red Hat
kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
vendor_redhat·2026-05-01·CVSS 7.0
CVE-2026-43037 [HIGH] kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
No description is available for this CVE.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Under investigation
Package: kernel (Red Hat Enterprise Linux 7) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 8) - Affected
Package: kernel (Red Hat Enterprise Linux 9) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 9) - Affected
VulDB
Linux Kernel up to 6.19.11 ip6_tunnel ip4ip6_err cb[] stack-based overflow
vuldb·2026-05-01
CVE-2026-43037 [CRITICAL] Linux Kernel up to 6.19.11 ip6_tunnel ip4ip6_err cb[] stack-based overflow
A vulnerability was found in Linux Kernel up to 6.19.11. It has been declared as critical. Affected by this issue is the function ip4ip6_err of the component ip6_tunnel. The manipulation of the argument cb[] results in stack-based buffer overflow.
This vulnerability is reported as CVE-2026-43037. The attacker must have access to the local network to execute the attack. No exploit exists.
It is recommended to upgrade the affected component.
GHSA
GHSA-p2wf-qj6m-x5fg: In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following p
ghsa_unreviewed·2026-05-01
CVE-2026-43037 [CRITICAL] CWE-787 GHSA-p2wf-qj6m-x5fg: In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following p
In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following problem.
ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written
by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes
IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region
as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff
at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr
value. __ip_options_echo() then reads optlen from attacker-controlled
packet data at sptr[rr+1] and copies that many bytes into dopt->__data,
a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).
To fix this we clear skb2->cb[], as suggested by Oskar Kjos.
Also add minimal IPv4 heade
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
Bugzilla
CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
bugzilla·2026-05-01
CVE-2026-43037 [HIGH] CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following problem.
ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written
by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes
IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region
as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff
at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr
value. __ip_options_echo() then reads optlen from attacker-controlled
packet data at sptr[rr+1] and copies that many bytes into dopt->__data,
a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).
To fix this we clear
https://git.kernel.org/stable/c/1063515ce15ff31065c4e7f8265f4c2fd3c54876https://git.kernel.org/stable/c/2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5https://git.kernel.org/stable/c/2edfa31769a4add828a7e604b21cb82aaaa05925https://git.kernel.org/stable/c/4a622658f384b03560834cbe8ffcfe69a278f7c8https://git.kernel.org/stable/c/590f622669b97eaf7b57a1de7b0a6e68c5d8b2c3https://git.kernel.org/stable/c/a0c4ce9900a108eaf55d0f3b399cb55999647d39https://git.kernel.org/stable/c/d6621f60192fe10c047a4487be42a6f4c150707fhttps://git.kernel.org/stable/c/ea9f65b27c8404e164848ebff1443310fd187629https://access.redhat.com/errata/RHSA-2026:22900https://access.redhat.com/errata/RHSA-2026:22940https://access.redhat.com/errata/RHSA-2026:22964https://access.redhat.com/errata/RHSA-2026:23224https://access.redhat.com/errata/RHSA-2026:23237https://access.redhat.com/errata/RHSA-2026:24343https://access.redhat.com/errata/RHSA-2026:25120https://access.redhat.com/errata/RHSA-2026:25121https://access.redhat.com/errata/RHSA-2026:25181https://access.redhat.com/errata/RHSA-2026:25186https://access.redhat.com/errata/RHSA-2026:25191https://access.redhat.com/errata/RHSA-2026:25193https://access.redhat.com/errata/RHSA-2026:25200https://access.redhat.com/errata/RHSA-2026:25217https://access.redhat.com/errata/RHSA-2026:25533https://access.redhat.com/errata/RHSA-2026:25534https://access.redhat.com/errata/RHSA-2026:26528https://access.redhat.com/errata/RHSA-2026:26535https://access.redhat.com/errata/RHSA-2026:26542https://access.redhat.com/errata/RHSA-2026:27719https://access.redhat.com/errata/RHSA-2026:27729https://access.redhat.com/errata/RHSA-2026:28738https://access.redhat.com/errata/RHSA-2026:28740https://access.redhat.com/errata/RHSA-2026:28741https://access.redhat.com/errata/RHSA-2026:28742https://access.redhat.com/errata/RHSA-2026:28748https://access.redhat.com/errata/RHSA-2026:28749https://access.redhat.com/errata/RHSA-2026:28750https://access.redhat.com/errata/RHSA-2026:28887https://access.redhat.com/errata/RHSA-2026:28962https://access.redhat.com/errata/RHSA-2026:33486https://access.redhat.com/errata/RHSA-2026:34098https://access.redhat.com/errata/RHSA-2026:41236https://access.redhat.com/security/cve/CVE-2026-43037https://bugzilla.redhat.com/show_bug.cgi?id=2464351https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43037.json
2026-05-01
Published