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VulnerabilityPublished Updated

CVE-2026-80602: Linux kernel · perf/x86/amd/lbr: Fix kernel address leakage

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f : update Linux kernel when convenient.

Data as of 30 Oct 2026, 13:18 UTC

Severity
Medium

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

  1. Disclosed: evidence found.

    CVE published 28 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f
Fixed in
  • fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < 208ecca408b1707ad86ea247d3d3e09d3606fc13
Fixed in
  • 208ecca408b1707ad86ea247d3d3e09d3606fc13
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < 5be478c1e08981ca91b34de310d7e2638171d9d8
Fixed in
  • 5be478c1e08981ca91b34de310d7e2638171d9d8
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < 5adfec05e804ce4bd3368b75df5e5b7b40ee960b
Fixed in
  • 5adfec05e804ce4bd3368b75df5e5b7b40ee960b
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < 5ab0eba9c8819506bcb72348fd701f8a9006f95e
Fixed in
  • 5ab0eba9c8819506bcb72348fd701f8a9006f95e
LinuxLinuxAffected
  • ≥ f4f925dae7419fc7a10af539c073871927ce3a24, < 2a892294b83f541115c94b0bb637f39bef187657
Fixed in
  • 2a892294b83f541115c94b0bb637f39bef187657

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

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