{
  "cveId": "CVE-2025-40063",
  "url": "https://patchblox.com/security/cve/CVE-2025-40063",
  "summary": "CVE-2025-40063 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40063 (version 6.17.6-1), released October 28, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  crypto: comp - Use same definition of context al...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  crypto: comp - Use same definition of context alloc and free ops  In commit 42d9f6c77479 (\u0022crypto: acomp - Move scomp stream allocation code into acomp\u0022), the crypto_acomp_streams struct was made to rely on having the alloc_ctx and free_ctx operations defined in the same order as the scomp_alg struct. But in that same commit, the alloc_ctx and free_ctx members of scomp_alg may be randomized by structure layout randomization, since they are contained in a pure ops structure (containing only function pointers). If the pointers within scomp_alg are randomized, but those in crypto_acomp_streams are not, then the order may no longer match. This fixes the problem by removing the union from scomp_alg so that both crypto_acomp_streams and scomp_alg will share the same definition of alloc_ctx and free_ctx, ensuring they will always have the same layout.",
  "published": "2025-10-28T12:15:40Z",
  "severity": "high",
  "cvss": 7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0013,
  "epssPercentile": 0.0263,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.6-1",
      "fix": "DEBIAN-CVE-2025-40063",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40063",
      "released": "2025-10-28T12:15:40Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}