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VulnerabilityPublished Updated

CVE-2026-31457: Linux kernel · mm/damon/sysfs: check contexts->nr in repeat_call_fn

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 12 Nov 2026, 03:47 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

AI-suggested

A fix has been implemented by adding the missing check for contexts->nr before dereferencing contexts_arr[0]. Users should apply the official Linux kernel update that includes this patch once available.

Description

A vulnerability in the Linux kernel's DAMON sysfs interface allows a NULL pointer dereference when the number of contexts (contexts->nr) is set to zero while DAMON is running. This occurs because certain functions are called without checking if contexts->nr is zero, leading to dereferencing contexts_arr[0].

References

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