SB2026052899 - Improper input validation in Linux kernel bpf
Published: May 28, 2026
Security Bulletin ID
SB2026052899
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-45971)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
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.
Remediation
Install update from vendor's website.