Skip to main content
VulnerabilityPublished Updated

CVE-2026-52936: Linux kernel · crypto: jitterentropy – replace long-held spinlock with mutex

Affects Linux kernelSource CVE Database V5

0
Compare

Not known to be exploited · fixed in ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:36 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in ff734dbd9e2432601a6dcd167cfb0bf8a36d1880, ec427dc5286da1ed08f2d510e2147a7581b0cb02, 18216b8ab6904753eaf31baf453cb02ecd202ba4 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < ff734dbd9e2432601a6dcd167cfb0bf8a36d1880
Fixed in
  • ff734dbd9e2432601a6dcd167cfb0bf8a36d1880
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < ec427dc5286da1ed08f2d510e2147a7581b0cb02
Fixed in
  • ec427dc5286da1ed08f2d510e2147a7581b0cb02
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < 18216b8ab6904753eaf31baf453cb02ecd202ba4
Fixed in
  • 18216b8ab6904753eaf31baf453cb02ecd202ba4
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < 21de77d06f6b540e870e64ef5ff56be4eb8ba08f
Fixed in
  • 21de77d06f6b540e870e64ef5ff56be4eb8ba08f
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < 4c03e6eb98443dc4d6d422a9780034a5b75376b4
Fixed in
  • 4c03e6eb98443dc4d6d422a9780034a5b75376b4
LinuxLinuxAffected
  • ≥ bb5530e4082446aac3a3d69780cd4dbfa4520013, < 01d798e9feb30212952d4e992801ba6bd6a82351
Fixed in
  • 01d798e9feb30212952d4e992801ba6bd6a82351

AI-suggested

A fix is available and has been applied in specific Linux kernel commits. Users should update to the fixed kernel versions containing the patches identified by the provided commit hashes to resolve the issue.

Description

A vulnerability in the Linux kernel's jitterentropy random number generator involved holding a spinlock during expensive entropy collection operations, causing potential stalls for parallel readers. The issue was resolved by replacing the spinlock with a mutex to allow contended readers to sleep rather than spin, improving concurrency and preventing lock hold in non-preemptible contexts.

References

Community reviews

Loading reviews…