CVE-2026-89984perf/x86/intel: Fix kernel address leakages in LBR stack
- —Not scoredno CVSS score yet
- 0.22%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/intel: Fix kernel address leakages in LBR stack Before Arch LBR gained CPL filtering support, a user-only branch stack could still contain kernel addresses. As a result, kernel branch records may be exposed to user space even when PERF_SAMPLE_BRANCH_USER is requested. For example, on Intel Tiger Lake, the following command can still report SYSRET/ERET entries with kernel-space from addresses: $ ./perf record -e cycles:p -o - --branch-filter any,save_type,u -- \ ./perf bench syscall basic --loop 1000 | \ ./perf script -i - --fields brstack|tr ' ' '\n'| \ grep -E '0x[89a-f][0-9a-f]{15}' Total time: 0.000 [sec] 0.219000 usecs/op 4,566,210 ops/sec [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.551 MB - ] 0xffffffff93c001c8/0x7f12a2b1d647/P/-/-/16959/SYSRET/- 0xffffffff93c001c8/0x7f12a2b1d5c2/P/-/-/17535/SYSRET/- 0xffffffff93c01928/0x7f12a2861000/P/-/-/6719/ERET/- 0xffffffff93c01928/0x7f12a297a000/P/-/-/8575/ERET/- The problem is that intel_pmu_lbr_filter() does not fully validate the privilege level of sampled entries. It filters some mismatches based on the branch type and the to address, but it does not reject entries whose from address violates the requested branch privilege filter. Fix this by extending software filtering to validate both from and to addresses against br_sel. Any LBR entry contains kernel address does not match the requested user filter is dropped. This prevents kernel addresses from appearing in user-only branch stacks.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 33 days later
· 33 days 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)
- 0.22% · top 88% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < f3705db4e6378cc1b91a38ce0fe2f879055e23ca
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < b589147f54adc62e4172e4acf079ad5fb7b3687f
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < be0628a101ac05b085aaa4f650d48bd3915e80fa
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < ca19a175e89b7de604fab736436cbab74030b47a
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < 6ac26161db27f7fb9d9e89ae240dbe52795496cc
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < 3c492c8eba02698ca893a9a13388d2adf6dfb839
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < 68c4b780b266a435261a1e029bede5ee3c2735cc
- affected 47125db27e47e9d44c878bf8925aa057824bb0d5 – < e2b0575900ff72aa82748af96e7bd564ade5157a
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/f3705db4e6378cc1b91a38ce0fe2f879055e23ca (opens in a new tab)
- https://git.kernel.org/stable/c/b589147f54adc62e4172e4acf079ad5fb7b3687f (opens in a new tab)
- https://git.kernel.org/stable/c/be0628a101ac05b085aaa4f650d48bd3915e80fa (opens in a new tab)
- https://git.kernel.org/stable/c/ca19a175e89b7de604fab736436cbab74030b47a (opens in a new tab)
- https://git.kernel.org/stable/c/6ac26161db27f7fb9d9e89ae240dbe52795496cc (opens in a new tab)
- https://git.kernel.org/stable/c/3c492c8eba02698ca893a9a13388d2adf6dfb839 (opens in a new tab)
- https://git.kernel.org/stable/c/68c4b780b266a435261a1e029bede5ee3c2735cc (opens in a new tab)
- https://git.kernel.org/stable/c/e2b0575900ff72aa82748af96e7bd564ade5157a (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-2026-80584 (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-2026-89984)Record last updated .