CVE-2026-74433 rxrpc: Fix UAF in rxgk_issue_challenge()
A use-after-free vulnerability in the Linux kernel's rxrpc module allows attackers to potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74433?
CVE-2026-74433 is a critical use after free vulnerability in Linux, published on 15 Aug 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 UAF in rxgk_issue_challenge()
Fix rxgk_issue_challenge() to free the page containing the challenge content after invoking the tracepoint as the whdr passed to the tracepoint points into the page just freed.
Which versions are affected by CVE-2026-74433?
How do I fix CVE-2026-74433?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-74433 being exploited?
There is no known exploitation of CVE-2026-74433 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74433, DEBIAN-CVE-2026-74433, GHSA-m4qf-hpr2-qv3g, UBUNTU-CVE-2026-74433.