SB20260928127 - Always-Incorrect Control Flow Implementation in Linux kernel bpf
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928127
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-98061)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to improper control flow handling in the BPF verifier when a CAP_BPF task performs a tail call directly from a synchronous callback frame. A local privileged user can load a BPF program containing such a tail call to cause a denial of service.
Remediation
Install update from vendor's website.