NULL pointer dereference in Linux kernel - CVE-2026-63973
Published: July 20, 2026
Vulnerability identifier: #VU138675
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-2026-63973
CWE-ID: CWE-476
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 a NULL pointer dereference in the mana network driver teardown path when cleaning up after a partial queue allocation failure. A local user can trigger queue allocation failure and subsequent teardown handling to cause a denial of service.
The issue can be reached through multiple teardown paths, including device removal, MTU change recovery, and internal error handling.
How to mitigate CVE-2026-63973
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0a9c520fdcb1cb2e79c163c12d359b5e1ee40007
- https://git.kernel.org/stable/c/17bfe0a8c014ee1d542ad352cd6a0a505361664a
- https://git.kernel.org/stable/c/26a96fa81496afe7d162d172ccdc8cb9dbc685d2
- https://git.kernel.org/stable/c/95e414f8324385771bdfd6d497a01d5593813ccb
- https://git.kernel.org/stable/c/da7e4a1aaf397af6a094f640c92d6bc7564c10db
- https://git.kernel.org/stable/c/da87896f34e0a51489811d1a684e2953099ca98f