# CVE-2026-31637

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31637
- **Published:** 2026-04-24
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** NVD-CWE-noinfo

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31637

## Citation

> AI Analytics. CVE-2026-31637. Retrieved 2026-08-03 from https://api.ai-analytics.org/cve/CVE-2026-31637. Derived from NIST NVD. Licensed CC0.

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