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Vulnerability record · CVE-2026-31637 · published 24 April 2026

CVE-2026-31637: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.76% · top 46.7%
9.8CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60 Patch
https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a
https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a Patch
https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d Patch
https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de Patch
https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c
https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352
https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31637), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.