perf/x86/intel: Fix kernel address leakages in LBR stack
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
CVE-2026-89984
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89984
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "f3705db4e6378cc1b91a38ce0fe2f879055e23ca",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "b589147f54adc62e4172e4acf079ad5fb7b3687f",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "be0628a101ac05b085aaa4f650d48bd3915e80fa",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "ca19a175e89b7de604fab736436cbab74030b47a",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "6ac26161db27f7fb9d9e89ae240dbe52795496cc",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "3c492c8eba02698ca893a9a13388d2adf6dfb839",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "68c4b780b266a435261a1e029bede5ee3c2735cc",
"versionType": "git"
},
{
"status": "affected",
"version": "47125db27e47e9d44c878bf8925aa057824bb0d5",
"lessThan": "e2b0575900ff72aa82748af96e7bd564ade5157a",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/events/intel/lbr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/events/intel/lbr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89984
Source reference:
/cveMetadata/cveId
Publisher severity
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- Event
- #36421 · Revision 1
- Added to Heist Feed
- Publisher date