{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a"
            },
            {
              "fixed": "beee051f259acd286fed64c32c2b31e6f5097eb5"
            },
            {
              "fixed": "e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305"
            },
            {
              "fixed": "a2567217ade970ecc458144b6be469bc015b23e5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.23"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31635.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: fix oversized RESPONSE authenticator length check\n\nrxgk_verify_response() decodes auth_len from the packet and is supposed\nto verify that it fits in the remaining bytes. The existing check is\ninverted, so oversized RESPONSE authenticators are accepted and passed\nto rxgk_decrypt_skb(), which can later reach skb_to_sgvec() with an\nimpossible length and hit BUG_ON(len).\n\nDecoded from the original latest-net reproduction logs with\nscripts/decode_stacktrace.sh:\n\nRIP: __skb_to_sgvec()\n  [net/core/skbuff.c:5285 (discriminator 1)]\nCall Trace:\n skb_to_sgvec() [net/core/skbuff.c:5305]\n rxgk_decrypt_skb() [net/rxrpc/rxgk_common.h:81]\n rxgk_verify_response() [net/rxrpc/rxgk.c:1268]\n rxrpc_process_connection()\n   [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364\n    net/rxrpc/conn_event.c:386]\n process_one_work() [kernel/workqueue.c:3281]\n worker_thread()\n   [kernel/workqueue.c:3353 kernel/workqueue.c:3440]\n kthread() [kernel/kthread.c:436]\n ret_from_fork() [arch/x86/kernel/process.c:164]\n\nReject authenticator lengths that exceed the remaining packet payload.",
  "id": "CVE-2026-31635",
  "modified": "2026-07-08T05:37:30.340078871Z",
  "published": "2026-04-24T14:44:49.963Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2567217ade970ecc458144b6be469bc015b23e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/beee051f259acd286fed64c32c2b31e6f5097eb5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31635.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31635"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/v12-security/pocs/tree/main/dirtydecrypt"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rxrpc: fix oversized RESPONSE authenticator length check"
}