{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52936","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.370Z","datePublished":"2026-06-24T07:14:26.649Z","dateUpdated":"2026-06-24T07:14:26.649Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-24T07:14:26.649Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: jitterentropy - replace long-held spinlock with mutex\n\njent_kcapi_random() serializes the shared jitterentropy state, but it\ncurrently holds a spinlock across the jent_read_entropy() call. That\npath performs expensive jitter collection and SHA3 conditioning, so\nparallel readers can trigger stalls as contending waiters spin for\nthe same lock.\n\nTo prevent non-preemptible lock hold, replace rng->jent_lock with a\nmutex so contended readers sleep instead of spinning on a shared lock\nheld across expensive entropy generation."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/jitterentropy-kcapi.c"],"versions":[{"version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","lessThan":"18216b8ab6904753eaf31baf453cb02ecd202ba4","status":"affected","versionType":"git"},{"version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","lessThan":"4c03e6eb98443dc4d6d422a9780034a5b75376b4","status":"affected","versionType":"git"},{"version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","lessThan":"ff734dbd9e2432601a6dcd167cfb0bf8a36d1880","status":"affected","versionType":"git"},{"version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","lessThan":"ec427dc5286da1ed08f2d510e2147a7581b0cb02","status":"affected","versionType":"git"},{"version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","lessThan":"01d798e9feb30212952d4e992801ba6bd6a82351","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/jitterentropy-kcapi.c"],"versions":[{"version":"4.2","status":"affected"},{"version":"0","lessThan":"4.2","status":"unaffected","versionType":"semver"},{"version":"6.6.141","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.91","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.33","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.10","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4"},{"url":"https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4"},{"url":"https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880"},{"url":"https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02"},{"url":"https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351"}],"title":"crypto: jitterentropy - replace long-held spinlock with mutex","x_generator":{"engine":"bippy-1.2.0"}}}}