Bug 2347708 (CVE-2022-49711)

Summary: CVE-2022-49711 kernel: bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:03:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()

In fsl_mc_bus_remove(), mc->root_mc_bus_dev->mc_io is passed to
fsl_destroy_mc_io(). However, mc->root_mc_bus_dev is already freed in
fsl_mc_device_remove(). Then reference to mc->root_mc_bus_dev->mc_io
triggers KASAN use-after-free. To avoid the use-after-free, keep the
reference to mc->root_mc_bus_dev->mc_io in a local variable and pass to
fsl_destroy_mc_io().

This patch needs rework to apply to kernels older than v5.15.
Comment 1 Avinash Hanwate 2025-02-26 13:35:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022631-CVE-2022-49711-3cab@gregkh/T
Comment 2 Avinash Hanwate 2025-02-26 17:37:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022631-CVE-2022-49711-3cab@gregkh/T