CVE-2026-80975 Linux Kernel - Memory Corruption

Linux kernel contains a stack buffer overflow caused by use of an on-stack reply buffer in qnap_mcu_exec() that can be overwritten by late or unsolicited MCU messages, letting attackers cause memory corruption, exploit requires triggering command timeout.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Memory Corruption
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for qnap-mcu buffer handling.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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