NULL Pointer Dereference in Linux kernel - CVE-2026-23369
Published: March 25, 2026
Vulnerability identifier: #VU124467
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23369
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the i2c_i801 driver when handling ACPI I/O operations during system boot. A local user can trigger concurrent access to the i801 ACPI I/O handler, leading to a situation where the bus lock mechanism attempts to access a deregistered memory region, resulting in a kernel NULL pointer dereference and system crash.
Exploitation occurs during early boot when multiple udev threads concurrently collect device information, and no additional privileges beyond standard system access are required.
How to mitigate CVE-2026-23369
Install security update from vendor's repository.