CVE-2026-31493 RDMA/efa: Fix use of completion ctx after free
A use-after-free vulnerability in the Linux kernel RDMA EFA driver allows attackers to potentially execute code or cause a denial of service via admin queue completion handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31493?
CVE-2026-31493 is a high-severity use after free vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
RDMA/efa: Fix use of completion ctx after free
On admin queue completion handling, if the admin command completed with error we print data from the completion context. The issue is that we already freed the completion context in polling/interrupts handler which means we print data from context in an unknown state (it might be already used again). Change the admin submission flow so alloc/dealloc of the context will be symmetric and dealloc will be called after any potential use of the context.
Weakness: CWE-416
Which versions are affected by CVE-2026-31493?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31493?
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-2026-31493 being exploited?
There is no known exploitation of CVE-2026-31493 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83381, BELL-CVE-2026-31493, DEBIAN-CVE-2026-31493, GHSA-fx4x-f93f-2jqv, ROOT-OS-DEBIAN-12-CVE-2026-31493, ROOT-OS-DEBIAN-13-CVE-2026-31493 and 3 more.