{"api_version":"1","generated_at":"2026-08-15T20:27:07+00:00","cve":"CVE-2026-72237","urls":{"html":"https://cve.report/CVE-2026-72237","api":"https://cve.report/api/cve/CVE-2026-72237.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72237","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72237"},"summary":{"title":"perf/x86/amd/brs: Fix kernel address leakage","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd/brs: Fix kernel address leakage\n\nA user-only branch stack can contain branches that originate from\nthe kernel. As a result, kernel addresses are exposed to user space\neven when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors\nsupporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries\nsuch as SYSRET/interrupt returns for which the branch-from addresses\nare in the kernel.\n\nE.g.\n\n  $ perf record -j any,u -c 4000 -e branch-brs -o - -- \\\n        perf bench syscall basic --loop 1000 | \\\n        perf script -i - -F brstack|tr ' ' '\\n'| \\\n        grep -E '0x[89a-f][0-9a-f]{15}'\n\n  ...\n  0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//-\n  ...\n\nBRS provides no hardware branch filtering, so privilege level\nfiltering is performed entirely in software. However, amd_brs_match_plm()\nonly validates the branch-to address against the requested privilege\nlevels. For branches from the kernel to user space, the branch-from\naddress is left unchecked and is leaked. Extend the software filter to\nalso validate the branch-from address, so that any branch record whose\nbranch-from address is in the kernel is dropped when\nPERF_SAMPLE_BRANCH_USER is requested.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:50","updated_at":"2026-08-15 06:21:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d","name":"https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154","name":"https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70","name":"https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa","name":"https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491","name":"https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72237","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72237","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 ac44b4a3d6137489f8fa2e794b12e849c6b22eaa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 90843d00dbc61220b66408ea0d8775cae9e51f70 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 046f6244da9b68e463a849b21446b9424e531491 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 2e706be56f418718bb3ae66c0aa94f9b61150e6d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 47915e855fb38b42133e31ba917d99565f862154 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/events/amd/brs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ac44b4a3d6137489f8fa2e794b12e849c6b22eaa","status":"affected","version":"8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08","versionType":"git"},{"lessThan":"90843d00dbc61220b66408ea0d8775cae9e51f70","status":"affected","version":"8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08","versionType":"git"},{"lessThan":"046f6244da9b68e463a849b21446b9424e531491","status":"affected","version":"8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08","versionType":"git"},{"lessThan":"2e706be56f418718bb3ae66c0aa94f9b61150e6d","status":"affected","version":"8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08","versionType":"git"},{"lessThan":"47915e855fb38b42133e31ba917d99565f862154","status":"affected","version":"8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/events/amd/brs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"5.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd/brs: Fix kernel address leakage\n\nA user-only branch stack can contain branches that originate from\nthe kernel. As a result, kernel addresses are exposed to user space\neven when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors\nsupporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries\nsuch as SYSRET/interrupt returns for which the branch-from addresses\nare in the kernel.\n\nE.g.\n\n  $ perf record -j any,u -c 4000 -e branch-brs -o - -- \\\n        perf bench syscall basic --loop 1000 | \\\n        perf script -i - -F brstack|tr ' ' '\\n'| \\\n        grep -E '0x[89a-f][0-9a-f]{15}'\n\n  ...\n  0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//-\n  ...\n\nBRS provides no hardware branch filtering, so privilege level\nfiltering is performed entirely in software. However, amd_brs_match_plm()\nonly validates the branch-to address against the requested privilege\nlevels. For branches from the kernel to user space, the branch-from\naddress is left unchecked and is leaked. Extend the software filter to\nalso validate the branch-from address, so that any branch record whose\nbranch-from address is in the kernel is dropped when\nPERF_SAMPLE_BRANCH_USER is requested."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:54:26.685Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa"},{"url":"https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70"},{"url":"https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491"},{"url":"https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d"},{"url":"https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154"}],"title":"perf/x86/amd/brs: Fix kernel address leakage","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72237","datePublished":"2026-08-15T05:54:26.685Z","dateReserved":"2026-08-09T03:40:39.914Z","dateUpdated":"2026-08-15T05:54:26.685Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:50","lastModifiedDate":"2026-08-15 06:21:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72237","Ordinal":"1","Title":"perf/x86/amd/brs: Fix kernel address leakage","CVE":"CVE-2026-72237","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72237","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd/brs: Fix kernel address leakage\n\nA user-only branch stack can contain branches that originate from\nthe kernel. As a result, kernel addresses are exposed to user space\neven when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors\nsupporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries\nsuch as SYSRET/interrupt returns for which the branch-from addresses\nare in the kernel.\n\nE.g.\n\n  $ perf record -j any,u -c 4000 -e branch-brs -o - -- \\\n        perf bench syscall basic --loop 1000 | \\\n        perf script -i - -F brstack|tr ' ' '\\n'| \\\n        grep -E '0x[89a-f][0-9a-f]{15}'\n\n  ...\n  0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//-\n  0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//-\n  ...\n\nBRS provides no hardware branch filtering, so privilege level\nfiltering is performed entirely in software. However, amd_brs_match_plm()\nonly validates the branch-to address against the requested privilege\nlevels. For branches from the kernel to user space, the branch-from\naddress is left unchecked and is leaked. Extend the software filter to\nalso validate the branch-from address, so that any branch record whose\nbranch-from address is in the kernel is dropped when\nPERF_SAMPLE_BRANCH_USER is requested.","Type":"Description","Title":"perf/x86/amd/brs: Fix kernel address leakage"}]}}}