CVE-2026-82961 Zephyr OS - Broken Access Control

Zephyr OS with CONFIG_USERSPACE=y contains a broken access control vulnerability caused by missing validation of GPIO pin arguments in gpio syscall handlers, letting user-mode threads with GPIO device access perform out-of-bounds kernel memory writes and reads, potentially leading to arbitrary code execution or kernel crash, exploit requires user-mode thread with GPIO device access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Remote Code Execution, Denial Of Service, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-787

Vendor fix

Update to a version with pin validation in gpio syscall handlers and range checks, or latest available version.

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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