{
  "cveId": "CVE-2026-99225",
  "url": "https://patchblox.com/security/cve/CVE-2026-99225",
  "summary": "CVE-2026-99225 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99225, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "keys: Check the authorization payload in process keyring searches",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  keys: Check the authorization payload in process keyring searches  An authorization payload and its saved credentials must remain valid while search_process_keyrings_rcu() searches the requestor\u0027s keyrings. The function validates the authorization key, then separately loads payload.data[0] and unconditionally reads rka-\u003Ecred. Validation does not prevent request_key_auth_revoke() from clearing the payload.  A request-key helper can assume authority and fork a descendant that inherits the authorization key. If the descendant misses in its own keyrings, it falls back to the saved requestor credentials. Successful target instantiation invalidates the authorization key without clearing the payload. After the helper exits, UMH_WAIT_PROC returns to the requester, which calls complete_request_key() and revokes that key.  With the descendant paused after validation, the paths can interleave as follows:    1. The descendant enters search_process_keyrings_rcu() under RCU and      key_validate() succeeds.   2. The helper instantiates the target, invalidates the authorization      key, and exits.   3. The requester resumes from UMH_WAIT_PROC, calls      complete_request_key(), and revokes the authorization key.      request_key_auth_revoke() sets its payload pointer to NULL.   4. The descendant loads NULL and dereferences rka-\u003Ecred.  This NULL dereference can oops the kernel. RCU delays payload disposal but does not prevent the pointer from being cleared.  Load the payload with dereference_key_rcu() and require a non-NULL result before validating the authorization key and searching its saved credentials. A non-NULL payload and its credentials remain alive for the caller\u0027s RCU read-side section; a cleared payload skips the fallback search and follows the existing error selection.  KASAN report as below:      Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI     KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]     RIP: 0010:search_process_keyrings_rcu\u002B0x32b/0x790",
  "published": "2026-11-02T16:17:47Z",
  "severity": "Moderate",
  "cvss": 4.7,
  "epss": 0.00182,
  "epssPercentile": 0.0786,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99225",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99225",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99225",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.14-1",
      "fix": "DEBIAN-CVE-2026-99225",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99225",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "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"
  }
}