CVE-2026-52936 (GCVE-0-2026-52936)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-06-24 07:14
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: bb5530e4082446aac3a3d69780cd4dbfa4520013
Version: bb5530e4082446aac3a3d69780cd4dbfa4520013
Version: bb5530e4082446aac3a3d69780cd4dbfa4520013
Version: bb5530e4082446aac3a3d69780cd4dbfa4520013
Version: bb5530e4082446aac3a3d69780cd4dbfa4520013
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{
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          "programFiles": [
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      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: jitterentropy - replace long-held spinlock with mutex\n\njent_kcapi_random() serializes the shared jitterentropy state, but it\ncurrently holds a spinlock across the jent_read_entropy() call. That\npath performs expensive jitter collection and SHA3 conditioning, so\nparallel readers can trigger stalls as contending waiters spin for\nthe same lock.\n\nTo prevent non-preemptible lock hold, replace rng-\u003ejent_lock with a\nmutex so contended readers sleep instead of spinning on a shared lock\nheld across expensive entropy generation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T07:14:26.649Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4"
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        {
          "url": "https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4"
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        },
        {
          "url": "https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351"
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      ],
      "title": "crypto: jitterentropy - replace long-held spinlock with mutex",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52936",
    "datePublished": "2026-06-24T07:14:26.649Z",
    "dateReserved": "2026-06-09T07:44:35.370Z",
    "dateUpdated": "2026-06-24T07:14:26.649Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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