CVE-2026-31457: Linux kernel · mm/damon/sysfs: check contexts->nr in repeat_call_fn
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 12 Nov 2026, 03:47 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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].