NULL pointer dereference in Linux kernel - CVE-2026-63810
Published: July 21, 2026
Vulnerability identifier: #VU138850
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-2026-63810
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the bdev pseudo-filesystem when userspace mounts it and accesses files. A local attacker can mount the pseudo-filesystem and access files to cause a denial of service.
The issue is triggered through move_mount() using inode_operations pointers that are equal to 0 for this pseudo-filesystem.
Affected software
Linux kernel
How to mitigate CVE-2026-63810
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3