Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-52936

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/06/2026
Last modified:
08/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> crypto: jitterentropy - replace long-held spinlock with mutex<br /> <br /> jent_kcapi_random() serializes the shared jitterentropy state, but it<br /> currently holds a spinlock across the jent_read_entropy() call. That<br /> path performs expensive jitter collection and SHA3 conditioning, so<br /> parallel readers can trigger stalls as contending waiters spin for<br /> the same lock.<br /> <br /> To prevent non-preemptible lock hold, replace rng-&gt;jent_lock with a<br /> mutex so contended readers sleep instead of spinning on a shared lock<br /> held across expensive entropy generation.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 4.2 (including) 6.6.141 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.91 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.33 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 7.0.10 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools