Answer in brief
CVE-2026-52936 records a Medium severity (CVSS 5.5) vulnerability in crypto: jitterentropy - replace long-held spinlock with mutex. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <21de77d06f6b540e870e64ef5ff56be4eb8ba08f || >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <18216b8ab6904753eaf31baf453cb02ecd202ba4 || >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <4c03e6eb98443dc4d6d422a9780034a5b75376b4 || >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 || >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <ec427dc5286da1ed08f2d510e2147a7581b0cb02 || >=bb5530e4082446aac3a3d69780cd4dbfa4520013 <01d798e9feb30212952d4e992801ba6bd6a82351 | 21de77d06f6b540e870e64ef5ff56be4eb8ba08f, 18216b8ab6904753eaf31baf453cb02ecd202ba4, 4c03e6eb98443dc4d6d422a9780034a5b75376b4, ff734dbd9e2432601a6dcd167cfb0bf8a36d1880, ec427dc5286da1ed08f2d510e2147a7581b0cb02, 01d798e9feb30212952d4e992801ba6bd6a82351 |
| Linux/Linuxgeneric | 4.2 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.