ghsa-rfcq-q5wv-mpcg
Vulnerability from github
Published
2025-10-04 09:30
Modified
2025-10-04 09:30
Details

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

crypto: af_alg - Set merge to zero early in af_alg_sendmsg

If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done.

Fix this by setting ctx->merge to zero near the start of the loop.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39931"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-04T08:15:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Set merge to zero early in af_alg_sendmsg\n\nIf an error causes af_alg_sendmsg to abort, ctx-\u003emerge may contain\na garbage value from the previous loop.  This may then trigger a\ncrash on the next entry into af_alg_sendmsg when it attempts to do\na merge that can\u0027t be done.\n\nFix this by setting ctx-\u003emerge to zero near the start of the loop.",
  "id": "GHSA-rfcq-q5wv-mpcg",
  "modified": "2025-10-04T09:30:20Z",
  "published": "2025-10-04T09:30:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39931"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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