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 :
March 18, 2026, 2:50 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
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.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
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
(CAPEC)
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).
Results are limited to the first 15 repositories due to potential performance issues.
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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Initial Analysis by [email protected]
Mar. 18, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.164 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.127 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (excluding) 5.15.201 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.74 Added Reference Type kernel.org: https://git.kernel.org/stable/c/148891e95014b5dc5878acefa57f1940c281c431 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a2ae33e1c6361e960a4d00f7cf75d880b54f9528 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b1983840287303e0dfb401b1b6cecc5ea7471e90 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c424e72cfa67e7e1477035058a8a659f2c0ea637 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c71dfb7833db7af652ee8f65011f14c97c47405d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 Types: Patch -
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