Out-of-bounds read in Linux kernel - CVE-2026-90349

Vulnerability identifier: #VU151137

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90349

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform an out-of-bounds memory access.

The vulnerability exists due to an out-of-bounds read in mt7996_tx() when processing a transmission with an unspecified mac80211 link identifier. A local user can cause mt7996_tx() to use the unset primary link identifier as an array index to perform an out-of-bounds memory access.

The primary link identifier remains unset until the first link is added.

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/4330a0ef9f75a54fde3548432a9a698f06bab635
• https://git.kernel.org/stable/c/637bb99cc766a858d744905e46638459ca128b6c
• https://git.kernel.org/stable/c/aff81505a84d27f83b4db8e039e813930cb23c2c

• Out-of-bounds read in Linux kernel mt76 mt7996 driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more