CVE-2026-64256xfs: don't wrap around quota ids in dqiterate
- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an unsigned 32-bit variable. If it happens to be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot for ID_MAX, then this addition will truncate to zero and the iteration starts over. Fix this by casting to u64.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 21d7500929c8a0b10e22a6755850c6f9a9280284 – < 249e311c2ba392ceaf9ebfc145a46922946f069a
- affected 21d7500929c8a0b10e22a6755850c6f9a9280284 – < d1c4c40599c376aeb0c93068a2ae344e79ee4b90
- affected 21d7500929c8a0b10e22a6755850c6f9a9280284 – < 2b14fe1e0924c6b901f4256456342569c5397abe
- affected 21d7500929c8a0b10e22a6755850c6f9a9280284 – < d766e4e5e85d829629c3ba503802fe1303d7b591
- affected 6.8
- unaffected < 6.8
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a (opens in a new tab)
- https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90 (opens in a new tab)
- https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe (opens in a new tab)
- https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48968 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64256)Record last updated .