crypto: jitterentropy - replace long-held spinlock with mutex
Summary
| CVE | CVE-2026-52936 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 08:16:23 UTC |
| Updated | 2026-07-08 20:31:02 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.001140000 probability, percentile 0.017180000 (date 2026-07-09)
Problem Types: NVD-CWE-noinfo
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected bb5530e4082446aac3a3d69780cd4dbfa4520013 18216b8ab6904753eaf31baf453cb02ecd202ba4 git | Not specified |
| CNA | Linux | Linux | affected bb5530e4082446aac3a3d69780cd4dbfa4520013 4c03e6eb98443dc4d6d422a9780034a5b75376b4 git | Not specified |
| CNA | Linux | Linux | affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 git | Not specified |
| CNA | Linux | Linux | affected bb5530e4082446aac3a3d69780cd4dbfa4520013 ec427dc5286da1ed08f2d510e2147a7581b0cb02 git | Not specified |
| CNA | Linux | Linux | affected bb5530e4082446aac3a3d69780cd4dbfa4520013 01d798e9feb30212952d4e992801ba6bd6a82351 git | Not specified |
| CNA | Linux | Linux | affected 4.2 | Not specified |
| CNA | Linux | Linux | unaffected 4.2 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.141 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.91 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.33 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.10 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.