CVE-2026-52936

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2026-06-24 Modified: 2026-10-30 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

Description

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.

Affected Software (8)

Vendor	Product	Version
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < 21de77d06f6b540e870e64ef5ff56be4eb8ba08f
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < 18216b8ab6904753eaf31baf453cb02ecd202ba4
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < 4c03e6eb98443dc4d6d422a9780034a5b75376b4
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < ff734dbd9e2432601a6dcd167cfb0bf8a36d1880
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < ec427dc5286da1ed08f2d510e2147a7581b0cb02
Linux	Linux	bb5530e4082446aac3a3d69780cd4dbfa4520013 < 01d798e9feb30212952d4e992801ba6bd6a82351
Linux	Linux	4.2
linux	linux_kernel	4.2 – 6.6.141