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Vulnerability record · CVE-2026-23221 · published 18 February 2026

CVE-2026-23221: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 98.0% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/148891e95014b5dc5878acefa57f1940c281c431 Patch
https://git.kernel.org/stable/c/1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 Patch
https://git.kernel.org/stable/c/a2ae33e1c6361e960a4d00f7cf75d880b54f9528 Patch
https://git.kernel.org/stable/c/b1983840287303e0dfb401b1b6cecc5ea7471e90 Patch
https://git.kernel.org/stable/c/c424e72cfa67e7e1477035058a8a659f2c0ea637 Patch
https://git.kernel.org/stable/c/c71dfb7833db7af652ee8f65011f14c97c47405d Patch
https://git.kernel.org/stable/c/dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23221), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.