CVE-2026-31637

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.