Bug 2492442 (CVE-2026-53115)

Summary: CVE-2026-53115 kernel: bus: fsl-mc: use generic driver_override infrastructure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's fsl-mc bus driver. During the driver probing process, a Use-After-Free (UAF) vulnerability can occur because the `match()` callback accesses the `driver_override` field without proper locking. This can lead to system instability or potentially allow an attacker to execute arbitrary code.
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Description OSIDB Bzimport 2026-06-24 18:12:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bus: fsl-mc: use generic driver_override infrastructure

When a driver is probed through __driver_attach(), the bus' match()
callback is called without the device lock held, thus accessing the
driver_override field without a lock, which can cause a UAF.

Fix this by using the driver-core driver_override infrastructure taking
care of proper locking internally.

Note that calling match() from __driver_attach() without the device lock
held is intentional. [1]
Comment 1 Mauro Matteo Cascella 2026-06-25 09:25:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062415-CVE-2026-53115-1078@gregkh/T