CVE-2026-31631 rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

What is CVE-2026-31631?

CVE-2026-31631 is a high-severity memory corruption vulnerability in Linux kernel, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

Fix rxgk_do_verify_authenticator() to check the buffer size before checking the nonce.

Weakness: CWE-787, CWE-125

Which versions are affected by CVE-2026-31631?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31631?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-31631 being exploited?

There is no known exploitation of CVE-2026-31631 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-31631, DEBIAN-CVE-2026-31631, GHSA-q633-5j2j-rqx5, UBUNTU-CVE-2026-31631.