NULL pointer dereference in Linux kernel - CVE-2026-64258
Published: July 27, 2026
Vulnerability identifier: #VU139732
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-2026-64258
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 fuse_uring request expiration logic in fs/fuse/dev_uring.c when handling a failed copy into the userspace ring buffer. A local user can trigger a failed copy operation to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-64258
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3