Integer overflow in Linux kernel - CVE-2026-64256
Published: July 27, 2026
Vulnerability identifier: #VU139733
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64256
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an integer overflow in dqiterate in fs/xfs/scrub/dqiterate.c when iterating quota records. A local user can trigger processing of a filesystem containing a quota record with the maximum quota id to cause a denial of service.
The issue can cause the iteration to wrap to zero and start over.
Affected software
Linux kernel
How to mitigate CVE-2026-64256
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3