Out-of-bounds read in Linux kernel - CVE-2026-90369

Vulnerability details

The vulnerability allows a local user to read or write memory out of bounds.

The vulnerability exists due to an out-of-bounds read and out-of-bounds write in the mt76_mmio_write_copy() and mt76_mmio_read_copy() helpers when processing buffer lengths that are not multiples of four. A local user can cause the helpers to process a buffer length that is not a multiple of four to read or write memory out of bounds.

Affected software

How to mitigate CVE-2026-90369

External References

• https://git.kernel.org/stable/c/6689b4a65e88d7b019e687fa9d6943ca070f3e43
• https://git.kernel.org/stable/c/6ed0fba58bb125a8d8de96e391aa86111166efca

Related Security Bulletins

• Out-of-bounds read in Linux kernel mediatek mt76 driver