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Description

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.

PUBLISHED Reserved 2026-03-09 | Published 2026-04-24 | Updated 2026-04-27 | Assigner Linux




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

17926a79320afa9b95df6b977b40cca6d8713cea (git) before 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a
affected

17926a79320afa9b95df6b977b40cca6d8713cea (git) before a149dcae23309df9de1c3b6b5d468610ef5ab7de
affected

17926a79320afa9b95df6b977b40cca6d8713cea (git) before 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60
affected

17926a79320afa9b95df6b977b40cca6d8713cea (git) before 58fcd1b156152613ba00a064a129fb69507ddd7d
affected

17926a79320afa9b95df6b977b40cca6d8713cea (git) before fe4447cd95623b1cfacc15f280aab73a6d7340b2
affected

Default status
affected

2.6.22
affected

Any version before 2.6.22
unaffected

6.6.135 (semver)
unaffected

6.12.82 (semver)
unaffected

6.18.23 (semver)
unaffected

6.19.13 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a

git.kernel.org/...c/a149dcae23309df9de1c3b6b5d468610ef5ab7de

git.kernel.org/...c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60

git.kernel.org/...c/58fcd1b156152613ba00a064a129fb69507ddd7d

git.kernel.org/...c/fe4447cd95623b1cfacc15f280aab73a6d7340b2

cve.org (CVE-2026-31637)

nvd.nist.gov (CVE-2026-31637)

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