CVE-2026-31391 crypto: atmel-sha204a - Fix OOM ->tfm_count leak
A memory allocation failure in the atmel-sha204a crypto driver leaks a counter, potentially blocking future reads and causing denial of service.
- 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-2026-31391?
CVE-2026-31391 is a medium-severity denial of service vulnerability in Linux kernel, published on 3 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:
crypto: atmel-sha204a - Fix OOM ->tfm_count leak
If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.
Which versions are affected by CVE-2026-31391?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31391?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-31391 being exploited?
There is no known exploitation of CVE-2026-31391 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31391, DEBIAN-CVE-2026-31391, GHSA-8v35-jwfj-qhmg, ROOT-OS-DEBIAN-11-CVE-2026-31391, ROOT-OS-DEBIAN-12-CVE-2026-31391, ROOT-OS-DEBIAN-13-CVE-2026-31391 and 3 more.