CVE-2026-90369 wifi: mt76: fix out-of-bounds access in mmio copy helpers
Out-of-bounds memory access in Linux kernel mt76 Wi-Fi driver allows attackers to cause crashes or execute code via crafted network packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90369?
CVE-2026-90369 is a memory corruption vulnerability in Linux, published on 17 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:
wifi: mt76: fix out-of-bounds access in mmio copy helpers
mt76_mmio_write_copy() and mt76_mmio_read_copy() iterate up to ALIGN(len, 4), so a length that is not a multiple of four reads past the source buffer (write_copy) or writes past the destination (read_copy). Copy the aligned body in the loop and handle the remaining tail through a 4-byte bounce buffer, keeping the register access width unchanged.
Which versions are affected by CVE-2026-90369?
How do I fix CVE-2026-90369?
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-2026-90369 being exploited?
There is no known exploitation of CVE-2026-90369 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90369, GHSA-6g4f-369r-h4vv, UBUNTU-CVE-2026-90369.