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CVE-2026-31637

9.8 · CRITICAL

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 th…

Published Apr 24, 2026EPSS 0.59%

Overview

CVE-2026-31637 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60Refgit.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67aRefgit.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8aRefgit.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7dRefgit.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7deRefgit.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092cRefgit.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352Refgit.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31637?

CVE-2026-31637 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31637?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31637?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31637?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31637 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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