CVE-2026-31661 wifi: brcmsmac: Fix dma_free_coherent() size
A size mismatch in the brcmsmac Wi-Fi driver's DMA memory freeing logic can lead to memory corruption and potential 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-2026-31661?
CVE-2026-31661 is a medium-severity memory corruption vulnerability in Linux kernel, published on 24 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:
wifi: brcmsmac: Fix dma_free_coherent() size
dma_alloc_consistent() may change the size to align it. The new size is saved in alloced.
Change the free size to match the allocation size.
Which versions are affected by CVE-2026-31661?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31661?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-31661 being exploited?
There is no known exploitation of CVE-2026-31661 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-84584, BELL-CVE-2026-31661, DEBIAN-CVE-2026-31661, GHSA-2g4h-425m-78f8, ROOT-OS-DEBIAN-11-CVE-2026-31661, ROOT-OS-DEBIAN-12-CVE-2026-31661 and 4 more.