CVE-2026-52936 Details
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.
A vulnerability in the Linux kernel's jitterentropy random number generator has been addressed. The issue arose because the function jent_kcapi_random() used a spinlock to manage access to shared entropy data, which could lead to performance stalls. This was particularly problematic during the jent_read_entropy() process, which involves costly jitter collection and SHA3 conditioning. As a result, simultaneous readers could experience delays while waiting for the lock to become available. The vulnerability has been fixed by replacing the spinlock with a mutex, allowing contending readers to sleep instead of actively spinning, thus improving efficiency during critical entropy generation.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the updated kernel can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351 | kernel.org | Patch |
| https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.2, < 6.6.141 >= 6.7, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |