Linux Kernel up to 6.18.22/6.19.12 rxrpc rxgk_verify_response privilege escalation

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.18.22/6.19.12. This issue affects the function rxgk_verify_response of the component rxrpc. Performing a manipulation results in an unknown weakness. This vulnerability is identified as CVE-2026-31632. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.22/6.19.12. This affects the function rxgk_verify_response of the component rxrpc. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix leak of rxgk context in rxgk_verify_response() Fix rxgk_verify_response() to clean up the rxgk context it creates.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31632 since 03/09/2026. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/26/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310529 (Linux Distros Unpatched Vulnerability : CVE-2026-31632), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.23 or 6.19.13 eliminates this vulnerability. Applying the patch 4b5e8365515f4409de7d3b92a439154ee4f90f6d/1bd3d01378c1f9ecd313d394b51c808c1f418615/7e1876caa8363056f58a21d3b31b82c2daf7e608 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (310529) and CERT Bund (WID-SEC-2026-1279). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Google Container-Optimized OS
• Debian Linux
• Red Hat Enterprise Linux
• Oracle Linux
• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5
• 6.19.6
• 6.19.7
• 6.19.8
• 6.19.9
• 6.19.10
• 6.19.11
• 6.19.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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