CVE-2026-31637

Summary

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: reject undecryptable rxkad response tickets

rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded.

A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes.

Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < 252157d939d179b5d767cb860ff8fa7f8723b67aaffected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < a75b3b361dd481d942c5f259a82d59718a41092caffected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < b3a808cd0790b5075aaa2bc3588edf02cd71d352affected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8aaffected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < a149dcae23309df9de1c3b6b5d468610ef5ab7deaffected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60affected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < 58fcd1b156152613ba00a064a129fb69507ddd7daffected
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea < fe4447cd95623b1cfacc15f280aab73a6d7340b2affected
LinuxLinux2.6.22affected
LinuxLinux0 < 2.6.22unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.135 <= 6.6.*unaffected
LinuxLinux6.12.82 <= 6.12.*unaffected
LinuxLinux6.18.23 <= 6.18.*unaffected
LinuxLinux6.19.13 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References