NULL pointer dereference in Linux kernel - CVE-2026-64263
Published: July 27, 2026
Vulnerability identifier: #VU139726
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-2026-64263
CWE-ID: CWE-476
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 a null pointer dereference in the fuse-uring request handling code when processing cancellation of available entries moved to the ent_in_userspace list. A local user can trigger cancellation of a crafted entry state to cause a denial of service.
The crash occurs because the first entry on the ent_in_userspace list may be dereferenced even when no fuse request is attached.
Affected software
Linux kernel
How to mitigate CVE-2026-64263
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3