Improper handling of exceptional conditions in Linux kernel - CVE-2026-53325
Published: June 30, 2026
Vulnerability identifier: #VU135887
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-53325
CWE-ID: CWE-755
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper exception handling in agp_amd64_probe() in the AMD64 AGP driver when probing for AMD northbridge hardware in a virtualized environment without a physical AMD northbridge. A local user can trigger driver initialization to cause a denial of service.
The issue occurs because a negative error from cache_nbs() is not handled correctly, allowing initialization to continue until a NULL pointer is dereferenced in amd64_fetch_size().
How to mitigate CVE-2026-53325
Install security update from vendor's repository.