GHSA-RFCQ-Q5WV-MPCG

Vulnerability from github – Published: 2025-10-04 09:30 – Updated: 2026-10-15 03:34
VLAI
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.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-39931"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-04T08:15:45Z",
    "severity": "MODERATE"
  },
  "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": "2026-10-15T03:34:57Z",
  "published": "2025-10-04T09:30:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39931"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
    },
    {
      "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/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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