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VulnerabilityPublished

CVE-2026-64239: Linux kernel · mm/damon/sysfs-schemes: delete tried region in regions_rmdirs()

Affects Linux kernelSource GCVE Database

0

Not known to be exploited.

Data as of 27 Oct 2026, 20:27 UTC

Severity
Medium

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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: 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 26 Oct 2026.

What to do

AI-suggested

A fix has been implemented in the Linux kernel to address this vulnerability by properly managing the linked list of region objects during reference count changes and initialization. Users should apply the official kernel updates containing this fix. No additional mitigation is required beyond applying the patch.

Description

A use-after-free vulnerability exists in the Linux kernel's DAMON sysfs component related to the management of tried region directory objects. The issue arises when the deletion callback for region objects is delayed, causing the linked list to contain freed objects, which can lead to list corruption and use-after-free conditions. This flaw can be triggered on kernels built with CONFIG_DEBUG_KOBJECT_RELEASE and has been reproducibly demonstrated. The vulnerability has been fixed by ensuring region objects are removed from the list when their reference count is decremented and by only adding region objects to the list after successful initialization.

References

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