ghsa-hccf-2qv6-3rfj
Vulnerability from github
Published
2025-12-16 18:31
Modified
2025-12-16 18:31
Details

In the Linux kernel, the following vulnerability has been resolved:

x86/CPU/AMD: Add RDSEED fix for Zen5

There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail.

Add a fix glue which checks microcode revisions.

[ bp: Add microcode revisions checking, rewrite. ]

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68313"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T16:16:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n  [ bp: Add microcode revisions checking, rewrite. ]",
  "id": "GHSA-hccf-2qv6-3rfj",
  "modified": "2025-12-16T18:31:34Z",
  "published": "2025-12-16T18:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68313"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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