Integer overflow in Linux kernel - CVE-2026-64267
Published: July 27, 2026
Vulnerability identifier: #VU139730
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-2026-64267
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 fuse_notify_prune() in the FUSE notification handling code when processing a crafted FUSE_NOTIFY_PRUNE notification on 32-bit kernels. A local user can send a specially crafted prune notification with a wrapped count value to cause a denial of service.
Exploitation requires a FUSE daemon capable of issuing crafted prune notifications, and the issue affects 32-bit kernel builds.
Affected software
Linux kernel
How to mitigate CVE-2026-64267
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3