{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.13-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  rxrpc: Fix RxGK token loading to check bounds  rxrpc_preparse_xdr_yfs_rxgk() reads the raw key length and ticket length from the XDR token as u32 values and passes each through round_up(x, 4) before using the rounded value for validation and allocation.  When the raw length is \u003e= 0xfffffffd, round_up() wraps to 0, so the bounds check and kzalloc both use 0 while the subsequent memcpy still copies the original ~4 GiB value, producing a heap buffer overflow reachable from an unprivileged add_key() call.  Fix this by:   (1) Rejecting raw key lengths above AFSTOKEN_GK_KEY_MAX and raw ticket      lengths above AFSTOKEN_GK_TOKEN_MAX before rounding, consistent with      the caps that the RxKAD path already enforces via AFSTOKEN_RK_TIX_MAX.   (2) Sizing the flexible-array allocation from the validated raw key      length via struct_size_t() instead of the rounded value.   (3) Caching the raw lengths so that the later field assignments and      memcpy calls do not re-read from the token, eliminating a class of      TOCTOU re-parse.  The control path (valid token with lengths within bounds) is unaffected.",
  "id": "DEBIAN-CVE-2026-31641",
  "modified": "2026-09-14T16:47:39.845490752Z",
  "published": "2026-04-24T15:16:43.463Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31641"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31641"
  ]
}