SB20260916117 - Infinite loop in Linux kernel bpf
Published: September 16, 2026
Security Bulletin ID
SB20260916117
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) Infinite loop (CVE-ID: CVE-2026-89991)
CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 an infinite loop in __pcpu_freelist_push() when an NMI re-enters pcpu_freelist_push() while the interrupted context holds the only possible CPU's freelist lock. A local user can trigger the affected BPF freelist push path to cause a denial of service.
The issue occurs on systems with only one possible CPU.
Remediation
Install update from vendor's website.