CVE-2026-19575 Zephyr OS - Privilege Escalation

Zephyr OS v4.2.x and v4.3.x with CONFIG_USERSPACE and CONFIG_DEVICE_DEINIT_SUPPORT enabled contains a privilege escalation vulnerability caused by improper validation of the dev argument in device_deinit() syscall, letting local unprivileged threads execute arbitrary kernel code, exploit requires CONFIG_USERSPACE and CONFIG_DEVICE_DEINIT_SUPPORT enabled.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-843

Vendor fix

Update to Zephyr OS v4.4.0 or later with the fix that changes object validation to K_OBJ_DRIVER_ANY or disable CONFIG_DEVICE_DEINIT_SUPPORT if not needed.

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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