SB20260928163 - Improper input validation in Linux kernel bpf
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928163
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-2026-98040)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in the BPF verifier's check_cond_jmp_op() function when verifying a crafted BPF program containing a register-form NULL check. A local user can load a crafted BPF program to cause a denial of service.
Remediation
Install update from vendor's website.