Use-After-Free in Linux Kernel FSL-MC Driver
CVE-2026-23221

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 18 February 2026

What is CVE-2026-23221?

In the Linux kernel, a vulnerability has been identified in the FSL-MC driver that occurs due to improper synchronization around the driver_override string. The driver_override_show() function attempts to read the string without acquiring the necessary device_lock, while the driver_override_store() function modifies and frees this string under the protection of the device_lock. This can potentially lead to a concurrent use-after-free condition, posing risks for system stability and security. The vulnerability is mitigated by ensuring that the device_lock is held during the read operation, preventing any simultaneous access that could lead to exploitation.

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