CVE-2026-23221
bus: fsl-mc: fix use-after-free in driver_override_show()
Description
In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation.
INFO
Published Date :
Feb. 18, 2026, 4:22 p.m.
Last Modified :
Feb. 23, 2026, 4:16 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the Linux kernel patch to fix the use-after-free vulnerability.
- Ensure the device_lock is held during driver_override_show() read operations.
- Update the Linux kernel to the latest patched version.
Public PoC/Exploit Available at Github
CVE-2026-23221 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2026-23221.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23221 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23221
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
Python
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The following list is the news that have been mention
CVE-2026-23221 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23221 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 23, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/148891e95014b5dc5878acefa57f1940c281c431 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 19, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/b1983840287303e0dfb401b1b6cecc5ea7471e90 Added Reference https://git.kernel.org/stable/c/c424e72cfa67e7e1477035058a8a659f2c0ea637 Added Reference https://git.kernel.org/stable/c/c71dfb7833db7af652ee8f65011f14c97c47405d Added Reference https://git.kernel.org/stable/c/dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 18, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation. Added Reference https://git.kernel.org/stable/c/1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 Added Reference https://git.kernel.org/stable/c/a2ae33e1c6361e960a4d00f7cf75d880b54f9528