CVE-2026-80602perf/x86/amd/lbr: Fix kernel address leakage
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd/lbr: Fix kernel address leakage A user-only branch stack can contain branches that originate from the kernel. As a result, kernel addresses are exposed to user space even when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors supporting X86_FEATURE_AMD_LBR_V2, perf can still report SYSRET/ERET entries for which the branch-from addresses are in the kernel. E.g. $ perf record -e cycles -o - -j any,save_type,u -- \ perf bench syscall basic --loop 1000 | \ perf script -i - -F brstack|tr ' ' '\n'| \ grep -E '0x[89a-f][0-9a-f]{15}' ... 0xffffffff81001268/0x717a90a38f1a/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a90a39157/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a90a2c628/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a90a41b60/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a90a260db/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a90a260db/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a8bef1c30/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH 0xffffffff81001268/0x717a8e4d3c90/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH ... The reason is that the hardware filter only considers the privilege level applicable to the branch target. Extend software filtering to also validate the branch-from addresses against br_sel, so that any branch record whose branch-from address is in the kernel is dropped when PERF_SAMPLE_BRANCH_USER is requested.
Timeline
ID reserved
By Linux
- 2 days later
· 2 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < 5adfec05e804ce4bd3368b75df5e5b7b40ee960b
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < 5be478c1e08981ca91b34de310d7e2638171d9d8
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < 208ecca408b1707ad86ea247d3d3e09d3606fc13
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < 5ab0eba9c8819506bcb72348fd701f8a9006f95e
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f
- affected f4f925dae7419fc7a10af539c073871927ce3a24 – < 2a892294b83f541115c94b0bb637f39bef187657
- affected 6.1
- unaffected < 6.1
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/5adfec05e804ce4bd3368b75df5e5b7b40ee960b (opens in a new tab)
- https://git.kernel.org/stable/c/5be478c1e08981ca91b34de310d7e2638171d9d8 (opens in a new tab)
- https://git.kernel.org/stable/c/208ecca408b1707ad86ea247d3d3e09d3606fc13 (opens in a new tab)
- https://git.kernel.org/stable/c/5ab0eba9c8819506bcb72348fd701f8a9006f95e (opens in a new tab)
- https://git.kernel.org/stable/c/fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f (opens in a new tab)
- https://git.kernel.org/stable/c/2a892294b83f541115c94b0bb637f39bef187657 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-67478 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80602)Record last updated .