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

Vulnerability identifier: #VU151110

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90369

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

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

• Out-of-bounds read in Linux kernel mediatek mt76 driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more