crypto: jitterentropy - replace long-held spinlock with mutex

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Summary

CVECVE-2026-52936
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 08:16:23 UTC
Updated2026-06-24 08:16:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: jitterentropy - replace long-held spinlock with mutex jent_kcapi_random() serializes the shared jitterentropy state, but it currently holds a spinlock across the jent_read_entropy() call. That path performs expensive jitter collection and SHA3 conditioning, so parallel readers can trigger stalls as contending waiters spin for the same lock. To prevent non-preemptible lock hold, replace rng->jent_lock with a mutex so contended readers sleep instead of spinning on a shared lock held across expensive entropy generation.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bb5530e4082446aac3a3d69780cd4dbfa4520013 18216b8ab6904753eaf31baf453cb02ecd202ba4 git Not specified
CNA Linux Linux affected bb5530e4082446aac3a3d69780cd4dbfa4520013 4c03e6eb98443dc4d6d422a9780034a5b75376b4 git Not specified
CNA Linux Linux affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 git Not specified
CNA Linux Linux affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ec427dc5286da1ed08f2d510e2147a7581b0cb02 git Not specified
CNA Linux Linux affected bb5530e4082446aac3a3d69780cd4dbfa4520013 01d798e9feb30212952d4e992801ba6bd6a82351 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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