CVE-2026-31637 | In the Linux kernel, the following vulnerability has been re… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-31637
State: PUBLISHED
Assigner: Linux
Reserved: 2026-03-09 15:48 UTC
Published: 2026-04-24 14:44 UTC
Last updated: 2026-06-01 16:13 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	17926a79320afa9b95df6b977b40cca6d8713cea < 252157d939d179b5d767cb860ff8fa7f8723b67a, 17926a79320afa9b95df6b977b40cca6d8713cea < a75b3b361dd481d942c5f259a82d59718a41092c, 17926a79320afa9b95df6b977b40cca6d8713cea < b3a808cd0790b5075aaa2bc3588edf02cd71d352, 17926a79320afa9b95df6b977b40cca6d8713cea < 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a …
Linux	Linux	—	2.6.22, 0 < 2.6.22, 5.10.258 ≤ 5.10., 5.15.209 ≤ 5.15. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (8)