CRITICAL: CVE-2026-31637 (CVSS 9.8) — multiple products

CVE: CVE-2026-31637

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

Severity: CRITICAL

Status: Critical advisory

Affected

_See vendor advisory_

Summary

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.

Verified Sources

References

https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60
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/fe4447cd95623b1cfacc15f280aab73a6d7340b2

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._

Lyrie Verdict

A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.

#critical