{"id":"CVE-2021-46971","state":"PUBLISHED","title":"perf/core: Fix unconditional security_locked_down() call","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix unconditional security_locked_down() call\n\nCurrently, the lockdown state is queried unconditionally, even though\nits result is used only if the PERF_SAMPLE_REGS_INTR bit is set in\nattr.sample_type. While that doesn't matter in case of the Lockdown LSM,\nit causes trouble with the SELinux's lockdown hook implementation.\n\nSELinux implements the locked_down hook with a check whether the current\ntask's type has the corresponding \"lockdown\" class permission\n(\"integrity\" or \"confidentiality\") allowed in the policy. This means\nthat calling the hook when the access control decision would be ignored\ngenerates a bogus permission check and audit record.\n\nFix this by checking sample_type first and only calling the hook when\nits result would be honored.","publishedAt":"2024-02-27T18:47:06.674Z","updatedAt":"2026-05-11T13:45:28.408Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"b246759284d6a2bc5b6f1009caeeb3abce2ec9ff","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"4348d3b5027bc3ff6336368b6c60605d4ef8e1ce","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"f5809ca4c311b71bfaba6d13f4e39eab0557895e","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"c7b0208ee370b89d20486fae71cd9abb759819c1","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.117","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.35","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.19","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.2","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":["https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff","https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce","https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e","https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1","https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:16.371Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/46xxx/CVE-2021-46971.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-46971","state":"PUBLISHED","datePublished":"2024-02-27T18:47:06.674Z","dateUpdated":"2026-05-11T13:45:28.408Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-27T18:42:55.943Z"},"containers":{"cna":{"title":"perf/core: Fix unconditional security_locked_down() call","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix unconditional security_locked_down() call\n\nCurrently, the lockdown state is queried unconditionally, even though\nits result is used only if the PERF_SAMPLE_REGS_INTR bit is set in\nattr.sample_type. While that doesn't matter in case of the Lockdown LSM,\nit causes trouble with the SELinux's lockdown hook implementation.\n\nSELinux implements the locked_down hook with a check whether the current\ntask's type has the corresponding \"lockdown\" class permission\n(\"integrity\" or \"confidentiality\") allowed in the policy. This means\nthat calling the hook when the access control decision would be ignored\ngenerates a bogus permission check and audit record.\n\nFix this by checking sample_type first and only calling the hook when\nits result would be honored."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"b246759284d6a2bc5b6f1009caeeb3abce2ec9ff","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"4348d3b5027bc3ff6336368b6c60605d4ef8e1ce","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"f5809ca4c311b71bfaba6d13f4e39eab0557895e","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"c7b0208ee370b89d20486fae71cd9abb759819c1","versionType":"git"},{"version":"b0c8fdc7fdb77586c3d1937050925b960743306e","status":"affected","lessThan":"08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.117","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.35","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.19","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.2","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff"},{"url":"https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce"},{"url":"https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e"},{"url":"https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1"},{"url":"https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:45:28.408Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.4.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.11.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.12.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-46971","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-02-28T20:22:11.491385Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:13:04.676Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:17:42.943Z"}}]}}}