{"id":"CVE-2026-31637","summary":"rxrpc: reject undecryptable rxkad response tickets","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.","modified":"2026-05-18T05:59:52.792160722Z","published":"2026-04-24T14:44:51.364Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31637.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"},{"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/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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"17926a79320afa9b95df6b977b40cca6d8713cea"},{"fixed":"47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a"},{"fixed":"a149dcae23309df9de1c3b6b5d468610ef5ab7de"},{"fixed":"22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"},{"fixed":"58fcd1b156152613ba00a064a129fb69507ddd7d"},{"fixed":"fe4447cd95623b1cfacc15f280aab73a6d7340b2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31637.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.22"},{"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"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31637.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}