Integer underflow in Linux kernel - CVE-2026-97551
Published: September 28, 2026
Vulnerability identifier: #VU152656
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97551
CWE-ID: CWE-191
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 underflow in XFS parent pointer update handling when processing parent pointer add or replacement updates that grow the attribute fork. A local user can trigger a parent pointer update that grows the attribute fork to cause a denial of service.
Exploitation requires an allocation group with exactly zero available blocks.
Affected software
Linux kernel
How to mitigate CVE-2026-97551
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3