Return of Stack Variable Address in Linux kernel - CVE-2026-80975
Published: September 12, 2026
Vulnerability identifier: #VU149423
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80975
CWE-ID: CWE-562
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt kernel stack memory.
The vulnerability exists due to use of an expired stack buffer in the qnap_mcu_exec() reply buffer when the serdev receive path processes a late reply or unsolicited MCU message after a command timeout or write failure. A local user can trigger processing of a late reply or unsolicited MCU message to corrupt kernel stack memory.
Affected software
Linux kernel
How to mitigate CVE-2026-80975
Install security update from vendor's repository.