CVE-2026-23221
Description
A use-after-free flaw was found in the Linux kernel's Freescale Management Complex (fsl-mc) bus driver. The driver_override_show() sysfs function reads the driver_override string without acquiring the device_lock, while driver_override_store() modifies and frees the string while holding the lock. This race condition can result in a use-after-free if the string is freed by a concurrent store operation while being read by the show function.
Statement
This vulnerability affects systems with Freescale/NXP QorIQ DPAA2 hardware using the fsl-mc bus driver. Exploitation requires concurrent sysfs access to the driver_override attribute, typically requiring local access with appropriate permissions. The flaw is specific to embedded and data plane acceleration hardware platforms.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 7.8 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | High | N/A |
| Integrity Impact | None | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Memory; Read Memory; Modify Application Data; Read Application Data; Alter Execution Logic
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