{"api_version":"1","generated_at":"2026-06-24T17:29:34+00:00","cve":"CVE-2026-52936","urls":{"html":"https://cve.report/CVE-2026-52936","api":"https://cve.report/api/cve/CVE-2026-52936.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52936","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52936"},"summary":{"title":"crypto: jitterentropy - replace long-held spinlock with mutex","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 08:16:23","updated_at":"2026-06-24 08:16:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351","name":"https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880","name":"https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02","name":"https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4","name":"https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4","name":"https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52936","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52936","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb5530e4082446aac3a3d69780cd4dbfa4520013 18216b8ab6904753eaf31baf453cb02ecd202ba4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb5530e4082446aac3a3d69780cd4dbfa4520013 4c03e6eb98443dc4d6d422a9780034a5b75376b4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ec427dc5286da1ed08f2d510e2147a7581b0cb02 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bb5530e4082446aac3a3d69780cd4dbfa4520013 01d798e9feb30212952d4e992801ba6bd6a82351 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.141 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * 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":["crypto/jitterentropy-kcapi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"18216b8ab6904753eaf31baf453cb02ecd202ba4","status":"affected","version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","versionType":"git"},{"lessThan":"4c03e6eb98443dc4d6d422a9780034a5b75376b4","status":"affected","version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","versionType":"git"},{"lessThan":"ff734dbd9e2432601a6dcd167cfb0bf8a36d1880","status":"affected","version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","versionType":"git"},{"lessThan":"ec427dc5286da1ed08f2d510e2147a7581b0cb02","status":"affected","version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","versionType":"git"},{"lessThan":"01d798e9feb30212952d4e992801ba6bd6a82351","status":"affected","version":"bb5530e4082446aac3a3d69780cd4dbfa4520013","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["crypto/jitterentropy-kcapi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.2"},{"lessThan":"4.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.141","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.141","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-06-24T07:14:26.649Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52936","datePublished":"2026-06-24T07:14:26.649Z","dateReserved":"2026-06-09T07:44:35.370Z","dateUpdated":"2026-06-24T07:14:26.649Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 08:16:23","lastModifiedDate":"2026-06-24 08:16:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52936","Ordinal":"1","Title":"crypto: jitterentropy - replace long-held spinlock with mutex","CVE":"CVE-2026-52936","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52936","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"crypto: jitterentropy - replace long-held spinlock with mutex"}]}}}