Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-31438

5.5 · MEDIUM

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…

Published Apr 22, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-31438 is a medium-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802eRefgit.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6dRefgit.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78eRefgit.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31438?

CVE-2026-31438 is a medium-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31438?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31438?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31438?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31438 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999