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CVE-2026-31637

rxrpc: reject undecryptable rxkad response tickets PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 17926a79320afa9b95df6b977b40cca6d8713cea before 252157d939d179b5d767cb860ff8fa7f8723b67a; affected 17926a79320afa9b95df6b977b40cca6d8713cea before a75b3b361dd481d942c5f259a82d59718a41092c; affected 17926a79320afa9b95df6b977b40cca6d8713cea before b3a808cd0790b5075aaa2bc3588edf02cd71d352; affected 17926a79320afa9b95df6b977b40cca6d8713cea before 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a; affected 17926a79320afa9b95df6b977b40cca6d8713cea before a149dcae23309df9de1c3b6b5d468610ef5ab7de; affected 17926a79320afa9b95df6b977b40cca6d8713cea before 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60; affected 17926a79320afa9b95df6b977b40cca6d8713cea before 58fcd1b156152613ba00a064a129fb69507ddd7d; affected 17926a79320afa9b95df6b977b40cca6d8713cea before fe4447cd95623b1cfacc15f280aab73a6d7340b2
Linux / Linuxaffected 2.6.22; unaffected 0 before 2.6.22; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.135 through 6.6.*; unaffected 6.12.82 through 6.12.*; unaffected 6.18.23 through 6.18.*; unaffected 6.19.13 through 6.19.*; unaffected 7.0 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

siemens-SADP

No English description supplied.

CISA-ADP

No English description supplied.

No references supplied.