Improper input validation in Linux kernel - CVE-2026-45971
Published: May 28, 2026
Vulnerability identifier: #VU132512
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-2026-45971
CWE-ID: CWE-20
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 input validation in the bpf program signature handling logic when processing a user-supplied signature size. A local user can provide an excessively large size value to cause a denial of service.
The issue can force the kernel into expensive allocation paths via kmalloc_large or vmalloc.
How to mitigate CVE-2026-45971
Install security update from vendor's repository.