SB20260928117 - Improper input validation in Linux kernel bpf
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928117
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-98084)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause the BPF verifier to accept unsafe programs.
The vulnerability exists due to improper precision propagation in the BPF verifier backtracking logic when verifying repeated bpf_loop() calls with callbacks. A local user can submit a crafted BPF program that repeatedly invokes bpf_loop() to cause the BPF verifier to accept unsafe programs.
Remediation
Install update from vendor's website.