CVE-2026-23077
published 2026-02-04CVE-2026-23077: In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge Patch series "mm/vma: fix…
PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.13%
3.3th percentile
In the Linux kernel, the following vulnerability has been resolved:
mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
Patch series "mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted
merge", v2.
Commit 879bca0a2c4f ("mm/vma: fix incorrectly disallowed anonymous VMA
merges") introduced the ability to merge previously unavailable VMA merge
scenarios.
However, it is handling merges incorrectly when it comes to mremap() of a
faulted VMA adjacent to an unfaulted VMA. The issues arise in three
cases:
1. Previous VMA unfaulted:
copied -----|
v
|-----------|.............|
| unfaulted |(faulted VMA)|
|-----------|.............|
prev
2. Next VMA unfaulted:
copied -----|
v
|.............|-----------|
|(faulted VMA)| unfaulted |
|.............|-----------|
next
3. Both adjacent VMAs unfaulted:
copied -----|
v
|-----------|.............|-----------|
| unfaulted |(faulted VMA)| unfaulted |
|-----------|.............|-----------|
prev next
This series fixes each of these cases, and introduces self tests to assert
that the issues are corrected.
I also test a further case which was already handled, to assert that my
changes continues to correctly handle it:
4. prev unfaulted, next faulted:
copied -----|
v
|-----------|.............|-----------|
| unfaulted |(faulted VMA)| faulted |
|-----------|.............|-----------|
prev next
This bug was discovered via a syzbot report, linked to in the first patch
in the series, I confirmed that this series fixes the bug.
I also discovered that we are failing to check that the faulted VMA was
not forked when merging a copied VMA in cases 1-3 above, an issue this
series also addresses.
I also added self tests to assert that this is resolved (and confirmed
that the tests failed prior to this).
I also cleaned up vma_expand() as part of this work, renamed
vma_had_uncowed_parents() to vma_is_fork_child() as the previous name was
unduly confusing, and simplified the comments around this function.
This patch (of 4
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.18.8-1 (forky) | linux 6.18.8-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= 879bca0a2c4f40b08d09a95a2a0c3c6513060b5c < a4d9dbfc1bab16e25fefd34b5e537a46bed8fc96 | a4d9dbfc1bab16e25fefd34b5e537a46bed8fc96 |
| linux | linux | >= 879bca0a2c4f40b08d09a95a2a0c3c6513060b5c < 61f67c230a5e7c741c352349ea80147fbe65bfae | 61f67c230a5e7c741c352349ea80147fbe65bfae |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.18.8-1 | 6.18.8-1 |
| linux | linux_kernel | >= 6.16 < 6.18.8 | 6.18.8 |
| ubuntu | linux-azure-6.17 | — | — |
| ubuntu | linux-azure-fde-6.17 | — | — |
| ubuntu | linux-gcp-6.17 | — | — |
| ubuntu | linux-oem-6.17 | — | — |
| ubuntu | linux-oracle-6.17 | — | — |
| ubuntu | linux-realtime-6.17 | — | — |
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_debian7.8LOW
vendor_redhat7.8HIGH
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Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2026-07-28
CVE-2026-23057 Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) 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:
- Foo-over-UDP (FOU);
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Drivers core;
- Null block device driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPIO subsystem;
- GPU drivers;
- I2C subsystem;
- IIO ADC drivers;
- IIO subsystem;
- On-Chip Interconnect management framework;
- IOMMU subsystem;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
- UACCE accelerator framework;
- MMC subsystem
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-07-24
CVE-2026-23057 Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) 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:
- Foo-over-UDP (FOU);
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Drivers core;
- Null block device driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPIO subsystem;
- GPU drivers;
- I2C subsystem;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- On-Chip Interconnect management framework;
- IOMMU subsystem;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
- UA
Ubuntu
Linux kernel (Azure CVM) vulnerabilities
vendor_ubuntu·2026-07-24
CVE-2025-71190 Linux kernel (Azure CVM) vulnerabilities
Title: Linux kernel (Azure CVM) 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:
- Foo-over-UDP (FOU);
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Drivers core;
- Null block device driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPIO subsystem;
- GPU drivers;
- I2C subsystem;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- On-Chip Interconnect management framework;
- IOMMU subsystem;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2026-07-23
CVE-2025-71190 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:
- Foo-over-UDP (FOU);
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Drivers core;
- Null block device driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPIO subsystem;
- GPU drivers;
- I2C subsystem;
- IIO ADC drivers;
- IIO subsystem;
- On-Chip Interconnect management framework;
- IOMMU subsystem;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
- UACCE accelerator framework;
- MMC subsystem;
-
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-20
CVE-2025-71190 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:
- Foo-over-UDP (FOU);
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Drivers core;
- Null block device driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPIO subsystem;
- GPU drivers;
- I2C subsystem;
- IIO ADC drivers;
- IIO subsystem;
- On-Chip Interconnect management framework;
- IOMMU subsystem;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
- UACCE accelerator framework;
- MMC subsystem;
- Ether
Red Hat
kernel: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
vendor_redhat·2026-02-04·CVSS 7.8
CVE-2026-23077 [HIGH] kernel: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
kernel: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
In the Linux kernel, the following vulnerability has been resolved:
mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
Patch series "mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted
merge", v2.
Commit 879bca0a2c4f ("mm/vma: fix incorrectly disallowed anonymous VMA
merges") introduced the ability to merge previously unavailable VMA merge
scenarios.
However, it is handling merges incorrectly when it comes to mremap() of a
faulted VMA adjacent to an unfaulted VMA. The issues arise in three
cases:
1. Previous VMA unfaulted:
copied -----|
v
|-----------|.............|
| unfaulted |(faulted VMA)|
|-----------|.............|
prev
2. Next VMA unfaulted:
copied -----|
v
|.............|-----------|
|(faulted VMA
Debian
CVE-2026-23077: linux - In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix...
vendor_debian·2026·CVSS 7.8
CVE-2026-23077 [HIGH] CVE-2026-23077: linux - In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix...
In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge Patch series "mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge", v2. Commit 879bca0a2c4f ("mm/vma: fix incorrectly disallowed anonymous VMA merges") introduced the ability to merge previously unavailable VMA merge scenarios. However, it is handling merges incorrectly when it comes to mremap() of a faulted VMA adjacent to an unfaulted VMA. The issues arise in three cases: 1. Previous VMA unfaulted: copied -----| v |-----------|.............| | unfaulted |(faulted VMA)| |-----------|.............| prev 2. Next VMA unfaulted: copied -----| v |.............|-----------| |(faulted VMA)| unfaulted | |.............|-----------| next 3. Both adjacent VMAs u
GHSA
GHSA-jfpv-p5jh-pjp7: In the Linux kernel, the following vulnerability has been resolved:
mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
Patch series "mm/v
ghsa_unreviewed·2026-02-04
CVE-2026-23077 [HIGH] CWE-416 GHSA-jfpv-p5jh-pjp7: In the Linux kernel, the following vulnerability has been resolved:
mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
Patch series "mm/v
In the Linux kernel, the following vulnerability has been resolved:
mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
Patch series "mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted
merge", v2.
Commit 879bca0a2c4f ("mm/vma: fix incorrectly disallowed anonymous VMA
merges") introduced the ability to merge previously unavailable VMA merge
scenarios.
However, it is handling merges incorrectly when it comes to mremap() of a
faulted VMA adjacent to an unfaulted VMA. The issues arise in three
cases:
1. Previous VMA unfaulted:
copied -----|
v
|-----------|.............|
| unfaulted |(faulted VMA)|
|-----------|.............|
prev
2. Next VMA unfaulted:
copied -----|
v
|.............|-----------|
|(faulted VMA)| unfaulted |
|.............|-----------|
next
3. Both adjace
OSV
CVE-2026-23077: In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge Patch series "mm/vma
osv·2026-02-04·CVSS 7.8
CVE-2026-23077 [HIGH] CVE-2026-23077: In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge Patch series "mm/vma
In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge Patch series "mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge", v2. Commit 879bca0a2c4f ("mm/vma: fix incorrectly disallowed anonymous VMA merges") introduced the ability to merge previously unavailable VMA merge scenarios. However, it is handling merges incorrectly when it comes to mremap() of a faulted VMA adjacent to an unfaulted VMA. The issues arise in three cases: 1. Previous VMA unfaulted: copied -----| v |-----------|.............| | unfaulted |(faulted VMA)| |-----------|.............| prev 2. Next VMA unfaulted: copied -----| v |.............|-----------| |(faulted VMA)| unfaulted | |.............|-----------| next 3. Both adjacent VMAs u
No detection rules found.
No public exploits indexed.
2026-02-04
Published