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VulnerabilityPublished Updated

CVE-2025-40196: Linux kernel · fs: quota: create dedicated workqueue for quota_release_work

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f12039df1515d5daf7d92e586ece5cefeb39561b : patch Linux kernel soon.

Data as of 10 Nov 2026, 15:03 UTC

Severity
High

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

Thin evidence

One scorer or none
Patch
Available – fixed in f12039df1515d5daf7d92e586ece5cefeb39561b, f846eacde280ecc3daedfe001580e3033565179e, 72b7ceca857f38a8ca7c5629feffc63769638974 +8

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2025

  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 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=6.1.120 <6.1.178
  • >=6.6.64 <6.6.114
  • >=6.12.4 <6.12.54
  • >=5.4.287 <5.5
  • >=5.10.231 <5.11
  • >=5.15.174 <5.16
Fixed in
  • f12039df1515d5daf7d92e586ece5cefeb39561b
  • f846eacde280ecc3daedfe001580e3033565179e
  • 72b7ceca857f38a8ca7c5629feffc63769638974
  • 8df2eedd371a1c24ecc4283581299d7737dfcd06
  • 8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0
  • 6.12.54
  • 6.6.114
  • 6.1.178
  • 5.16
  • 5.11
  • 5.5
LinuxLinuxAffected
  • =6.13
Fixed in–

AI-suggested

The issue has been fixed in Linux kernel versions 5.16, 5.11, 6.1.178, 6.6.114, and 6.12.54 and later. Users should upgrade to these or later kernel versions to remediate the vulnerability. No additional mitigation steps are required beyond applying the official kernel updates.

Description

A kernel panic vulnerability exists in the Linux kernel's quota subsystem due to improper workqueue handling for quota_release_work. This occurs when writeback is triggered by a sync call on an opened file using the f2fs filesystem, causing a flush of quota_release_work on a workqueue lacking the required memory reclaim flag. The issue has been fixed by creating a dedicated workqueue with the appropriate flag to prevent kernel panic.

References

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