CVE-2026-31739 crypto: tegra - Add missing CRYPTO_ALG_ASYNC
Missing async flag in Tegra crypto driver causes kernel crashes when synchronous algorithms are requested, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31739?
CVE-2026-31739 is a high-severity denial of service vulnerability in Linux kernel, published on 1 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
crypto: tegra - Add missing CRYPTO_ALG_ASYNC
The tegra crypto driver failed to set the CRYPTO_ALG_ASYNC on its asynchronous algorithms, causing the crypto API to select them for users that request only synchronous algorithms. This causes crashes (at least). Fix this by adding the flag like what the other drivers do. Also remove the unnecessary CRYPTO_ALG_TYPE_* flags, since those just get ignored and overridden by the registration function anyway.
Which versions are affected by CVE-2026-31739?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31739?
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-2026-31739 being exploited?
There is no known exploitation of CVE-2026-31739 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31739, DEBIAN-CVE-2026-31739, GHSA-f395-x2gf-vh84, UBUNTU-CVE-2026-31739.