SB20260828187 - Information disclosure in Linux kernel events amd
Published: August 28, 2026
Security Bulletin ID
SB20260828187
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) Information disclosure (CVE-ID: CVE-2026-80602)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper access control in the AMD last branch record filtering logic in perf when processing user-only branch stack sampling requests. A local user can collect branch stack records to disclose sensitive information.
Only AMD processors supporting X86_FEATURE_AMD_LBR_V2 are affected.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/208ecca408b1707ad86ea247d3d3e09d3606fc13
- https://git.kernel.org/stable/c/2a892294b83f541115c94b0bb637f39bef187657
- https://git.kernel.org/stable/c/5ab0eba9c8819506bcb72348fd701f8a9006f95e
- https://git.kernel.org/stable/c/5be478c1e08981ca91b34de310d7e2638171d9d8
- https://git.kernel.org/stable/c/fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f