Linux Kernel RXRPC RXKAD Ticket Decrypt OOB Parsing
CVE-2026-31637 Published on April 24, 2026
rxrpc: reject undecryptable rxkad response tickets
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.
Products Associated with CVE-2026-31637
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Affected Versions
Linux:- Version 17926a79320afa9b95df6b977b40cca6d8713cea and below 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a is affected.
- Version 17926a79320afa9b95df6b977b40cca6d8713cea and below a149dcae23309df9de1c3b6b5d468610ef5ab7de is affected.
- Version 17926a79320afa9b95df6b977b40cca6d8713cea and below 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60 is affected.
- Version 17926a79320afa9b95df6b977b40cca6d8713cea and below 58fcd1b156152613ba00a064a129fb69507ddd7d is affected.
- Version 17926a79320afa9b95df6b977b40cca6d8713cea and below fe4447cd95623b1cfacc15f280aab73a6d7340b2 is affected.
- Version 2.6.22 is affected.
- Before 2.6.22 is unaffected.
- Version 6.6.135, <= 6.6.* is unaffected.
- Version 6.12.82, <= 6.12.* is unaffected.
- Version 6.18.23, <= 6.18.* is unaffected.
- Version 6.19.13, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.