CVE-2026-52936: Linux kernel · crypto: jitterentropy – replace long-held spinlock with mutex
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 : update Linux kernel when convenient.
Data as of 30 Oct 2026, 12:36 UTC
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
Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
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
- git.kernel.org/stable/c/21de77d06f6b540e870e64ef5ff56be4eb8ba08f (opens in a new tab)
- git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4 (opens in a new tab)
- git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4 (opens in a new tab)
- git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 (opens in a new tab)
- git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02 (opens in a new tab)
- git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351 (opens in a new tab)