SB20260912201 - Out-of-bounds write in Linux kernel bpf
Published: September 12, 2026 Updated: October 1, 2026
Security Bulletin ID
SB20260912201
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-89580)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to write out of bounds.
The vulnerability exists due to a race condition in __bpf_get_stack when a preemptible BPF program accesses a reused per-CPU callchain buffer. A local user can execute a preemptible BPF program to write out of bounds.
The issue can affect non-sleepable raw tracepoint programs on PREEMPT kernels.
Remediation
Install update from vendor's website.