CVE-2026-43077 crypto: algif_aead - Fix minimum RX size check for decryption
A missing tag size check in the Linux kernel's AEAD decryption allows attackers to cause a denial of service via malformed input.
- 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-2026-43077?
CVE-2026-43077 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 May 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: algif_aead - Fix minimum RX size check for decryption
The check for the minimum receive buffer size did not take the tag size into account during decryption. Fix this by adding the required extra length.
Which versions are affected by CVE-2026-43077?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43077?
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-2026-43077 being exploited?
There is no known exploitation of CVE-2026-43077 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43077, DEBIAN-CVE-2026-43077, GHSA-6m8x-q95v-ph67, ROOT-OS-DEBIAN-11-CVE-2026-43077, ROOT-OS-UBUNTU-2204-CVE-2026-43077, ROOT-OS-UBUNTU-2404-CVE-2026-43077 and 7 more.