{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "17926a79320afa9b95df6b977b40cca6d8713cea"
            },
            {
              "fixed": "252157d939d179b5d767cb860ff8fa7f8723b67a"
            },
            {
              "fixed": "a75b3b361dd481d942c5f259a82d59718a41092c"
            },
            {
              "fixed": "b3a808cd0790b5075aaa2bc3588edf02cd71d352"
            },
            {
              "fixed": "47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a"
            },
            {
              "fixed": "a149dcae23309df9de1c3b6b5d468610ef5ab7de"
            },
            {
              "fixed": "22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"
            },
            {
              "fixed": "58fcd1b156152613ba00a064a129fb69507ddd7d"
            },
            {
              "fixed": "fe4447cd95623b1cfacc15f280aab73a6d7340b2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.22"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.135"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.82"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "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-2026-31637.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: reject undecryptable rxkad response tickets\n\nrxkad_decrypt_ticket() decrypts the RXKAD response ticket and then\nparses the buffer as plaintext without checking whether\ncrypto_skcipher_decrypt() succeeded.\n\nA malformed RESPONSE can therefore use a non-block-aligned ticket\nlength, make the decrypt operation fail, and still drive the ticket\nparser with attacker-controlled bytes.\n\nCheck the decrypt result and abort the connection with RXKADBADTICKET\nwhen ticket decryption fails.",
  "id": "CVE-2026-31637",
  "modified": "2026-07-08T05:37:36.809835827Z",
  "published": "2026-04-24T14:44:51.364Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31637.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31637"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rxrpc: reject undecryptable rxkad response tickets"
}