CVE-2026-52936

In 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.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

Published

2026-06-24

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351
• https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4
• https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4
• https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02
• https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880

Check your stackJSON