CVE-2026-80737 serial: amba-pl011: synchronize DMA teardown
A race condition in the Linux kernel's AMBA PL011 serial driver allows use-after-free, potentially leading to code execution or 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-2026-80737?
CVE-2026-80737 is a high-severity use after free vulnerability in Linux, published on 3 Sep 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:
serial: amba-pl011: synchronize DMA teardown
dmaengine_terminate_all() does not wait for a running callback, so the TX callback can still touch the TX buffer after it is freed. The RX poll timer reads the RX buffers without the port lock.
Switch to dmaengine_terminate_sync() and delete the RX timer before freeing the buffers.
Which versions are affected by CVE-2026-80737?
How do I fix CVE-2026-80737?
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-2026-80737 being exploited?
There is no known exploitation of CVE-2026-80737 in the wild and no public exploit code.
Sources
Also known as AZL-99044, BELL-CVE-2026-80737, DEBIAN-CVE-2026-80737, GHSA-j4vm-79j3-8jfc, UBUNTU-CVE-2026-80737.