CVE-2026-31633 rxrpc: Fix integer overflow in rxgk_verify_response()

What is CVE-2026-31633?

CVE-2026-31633 is a critical 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 integer overflow in rxgk_verify_response()

In rxgk_verify_response(), there's a potential integer overflow due to rounding up token_len before checking it, thereby allowing the length check to be bypassed.

Fix this by checking the unrounded value against len too (len is limited as the response must fit in a single UDP packet).

Weakness: CWE-190

Which versions are affected by CVE-2026-31633?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31633?

Apply the vendor's patch.

Is CVE-2026-31633 being exploited?

There is no known exploitation of CVE-2026-31633 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-2026-31633, DEBIAN-CVE-2026-31633, GHSA-5j64-84jf-59q3, UBUNTU-CVE-2026-31633.