What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-17

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.

Affected products

• Linux kernel: from 6.8 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 7.2-rc1, 7.2-rc2, 7.2-rc3 — fixed in 6.12.96, 6.18.39, 7.1.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.96, 6.18.39, 7.1.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a
• https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe
• https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90
• https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591

Get alerted when CVE-2026-64256 or the next vulnerability affects your stack