Reliance on undefined behavior in Linux kernel - CVE-2026-80999

Vulnerability identifier: #VU149472

CSH Severity: Low

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

CVE-ID: CVE-2026-80999

CWE-ID: CWE-758

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to trigger a kernel warning.

The vulnerability exists due to improper GPIO API selection in the rtl83xx_reset_assert() and rtl83xx_reset_deassert() helpers when handling reset GPIOs controlled by sleeping controllers. A local privileged user can trigger device probing with such a GPIO configuration to trigger a kernel warning.

Linux kernel
Debian Linux
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)
linux (Debian 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
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/1610a8c2b93e815e3dc8643a2a69ab1c37975a6a
• https://git.kernel.org/stable/c/c32cf5292a0dd70c4afc138b4dc45743a190cd5a
• https://git.kernel.org/stable/c/f71087e7c63aa3e99bf65d7ddf91eb4fd3545778
• https://git.kernel.org/stable/c/fb58b6a696b30bcbfbe0cfc0a91b19c816a955fc

• Reliance on undefined behavior in Linux kernel dsa realtek driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more