CVE-2026-31637
Published: April 25, 2026Last modified: June 2, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.175-r0) |
| 25 LTS | linux-lts | Fixed (6.12.85-r0) | |
| Stream | linux-lts | Fixed (6.12.85-r0) |
References
- https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60
- https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a
- https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a
- https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d
- https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de
- https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c
- https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352
- https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2