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VulnerabilityPublished Updated

CVE-2026-64256: Linux kernel · xfs: don't wrap around quota ids in dqiterate

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d766e4e5e85d829629c3ba503802fe1303d7b591 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:51 UTC

Severity
Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in d766e4e5e85d829629c3ba503802fe1303d7b591, d1c4c40599c376aeb0c93068a2ae344e79ee4b90, 249e311c2ba392ceaf9ebfc145a46922946f069a +1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 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 6 Nov 2026.

What to do

Upgrade Linux kernel to d766e4e5e85d829629c3ba503802fe1303d7b591, d1c4c40599c376aeb0c93068a2ae344e79ee4b90, 249e311c2ba392ceaf9ebfc145a46922946f069a or 2b14fe1e0924c6b901f4256456342569c5397abe.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < d766e4e5e85d829629c3ba503802fe1303d7b591
Fixed in
  • d766e4e5e85d829629c3ba503802fe1303d7b591
LinuxLinuxAffected
  • ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < d1c4c40599c376aeb0c93068a2ae344e79ee4b90
Fixed in
  • d1c4c40599c376aeb0c93068a2ae344e79ee4b90
LinuxLinuxAffected
  • ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < 249e311c2ba392ceaf9ebfc145a46922946f069a
Fixed in
  • 249e311c2ba392ceaf9ebfc145a46922946f069a
LinuxLinuxAffected
  • ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < 2b14fe1e0924c6b901f4256456342569c5397abe
Fixed in
  • 2b14fe1e0924c6b901f4256456342569c5397abe
LinuxLinuxAffected
  • =6.8
Fixed in–

AI-suggested

This issue has been fixed in the Linux kernel versions identified by the commits d766e4e5e85d829629c3ba503802fe1303d7b591, d1c4c40599c376aeb0c93068a2ae344e79ee4b90, 249e311c2ba392ceaf9ebfc145a46922946f069a, and 2b14fe1e0924c6b901f4256456342569c5397abe. Users should update to a Linux kernel version including these fixes. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's XFS filesystem quota management could cause quota ID iteration to wrap around due to 32-bit unsigned integer overflow. This issue was fixed by changing the quota ID variable to a 64-bit type to prevent iteration restart.

References

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