Incorrect calculation in Linux kernel - CVE-2026-90376

Vulnerability identifier: #VU151117

CSH Severity: Medium

CVSS v4: 6 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90376

CWE-ID: CWE-682

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to incorrect MLD ID assignment in the mt7996 MAC transmission descriptor handling when transmitting frames directed to a third link while that link is in power-saving mode. A remote attacker can transmit frames directed to a third link to cause a denial of service.

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/0a951ff6704db7b46c3f6d03b77e6053122be8ab
• https://git.kernel.org/stable/c/5183b9f092fc0041618f38f895bd0ad860c26ca9
• https://git.kernel.org/stable/c/ce35ecffc96e6d097d27b6fe30677a2cfe2e0461

• Incorrect calculation in Linux kernel mt76 mt7996 driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more