Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-31457

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: check contexts->nr in repeat_call_fn damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(), damo…

Published Apr 22, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-31457 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:

mm/damon/sysfs: check contexts->nr in repeat_call_fn

damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(),

damon_sysfs_upd_schemes_stats(), and

damon_sysfs_upd_schemes_effective_quotas() without checking contexts->nr.

If nr_contexts is set to 0 via sysfs while DAMON is running, these

functions dereference contexts_arr[0] and cause a NULL pointer

dereference. Add the missing check.

For example, the issue can be reproduced using DAMON sysfs interface and

DAMON user-space tool (damo) [1] like below.

$ sudo damo start --refresh_interval 1s

$ echo 0 | sudo tee \

/sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contexts

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/3527e9fdc38570cea0f6ddb7a2c9303d4044b217Refgit.kernel.org/stable/c/652cd0641a763dd0e846b0d12814977fadb2b7d8Refgit.kernel.org/stable/c/6557004a8b59c7701e695f02be03c7e20ed1cc15

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31457?

CVE-2026-31457 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-2026-31457?

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-2026-31457?

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-2026-31457?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31457 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