CVE-2026-90369 PUBLISHED

wifi: mt76: fix out-of-bounds access in mmio copy helpers

Assigner: Linux
Reserved: 11.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 2df00805f7dbaa46b60c682aad0d76270b7ba266 to 6ed0fba58bb125a8d8de96e391aa86111166efca (excl.)
  • affected from 2df00805f7dbaa46b60c682aad0d76270b7ba266 to 6689b4a65e88d7b019e687fa9d6943ca070f3e43 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.19 is affected
  • unaffected from 0 to 6.19 (excl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References