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🛡️ CVE-2026-31438 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

When a process crashes and the kernel writes a core dump to a 9P

filesystem, __kernel_write() creates an ITER_KVEC iterator. This

iterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which

only handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,

hitting the BUG() for any other type.

Fix this by adding netfs_limit_kvec() following the same pattern as

netfs_limit_bvec(), since both kvec and bvec are simple segment arrays

with pointer and length fields. Dispatch it from netfs_limit_iter() when

the iterator type is ITER_KVEC.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-31438 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.11)
  • linux-kernel

Timeline and source

Published on 22 April 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31438 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-22
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.11
linux-kernel — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.