CVE-2026-64256: Linux kernel · xfs: don't wrap around quota ids in dqiterate
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d766e4e5e85d829629c3ba503802fe1303d7b591 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:51 UTC
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
Disclosed: evidence found.
CVE published 25 Jul 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 6 Nov 2026.
What to do
Upgrade Linux kernel to d766e4e5e85d829629c3ba503802fe1303d7b591, d1c4c40599c376aeb0c93068a2ae344e79ee4b90, 249e311c2ba392ceaf9ebfc145a46922946f069a or 2b14fe1e0924c6b901f4256456342569c5397abe.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| 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
- git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a (opens in a new tab)
- git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90 (opens in a new tab)
- git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe (opens in a new tab)
- git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591 (opens in a new tab)