CVE-2026-80602: Linux kernel · perf/x86/amd/lbr: Fix kernel address leakage
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f : update Linux kernel when convenient.
Data as of 30 Oct 2026, 13:18 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f, 208ecca408b1707ad86ea247d3d3e09d3606fc13, 5be478c1e08981ca91b34de310d7e2638171d9d8 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
A fix is available and has been applied in the Linux kernel. Users should update to the fixed kernel versions containing the relevant commits to mitigate this vulnerability. No additional mitigation steps are required beyond applying the official kernel update.
Description
A vulnerability in the Linux kernel's perf subsystem for AMD processors allows kernel addresses to be leaked to user space when using the branch stack feature. This occurs because the hardware filter only checks the privilege level of the branch target, not the branch-from address, exposing kernel addresses even when user-only branch sampling is requested. The issue has been fixed by extending software filtering to drop branch records originating from the kernel.
References
- git.kernel.org/stable/c/5adfec05e804ce4bd3368b75df5e5b7b40ee960b (opens in a new tab)
- git.kernel.org/stable/c/5be478c1e08981ca91b34de310d7e2638171d9d8 (opens in a new tab)
- git.kernel.org/stable/c/208ecca408b1707ad86ea247d3d3e09d3606fc13 (opens in a new tab)
- git.kernel.org/stable/c/5ab0eba9c8819506bcb72348fd701f8a9006f95e (opens in a new tab)
- git.kernel.org/stable/c/fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f (opens in a new tab)
- git.kernel.org/stable/c/2a892294b83f541115c94b0bb637f39bef187657 (opens in a new tab)