Bug 2401558 (CVE-2022-50481)

Summary: CVE-2022-50481 kernel: cxl: fix possible null-ptr-deref in cxl_guest_init_afu|adapter()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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OS: Linux   
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Description OSIDB Bzimport 2025-10-04 16:07:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

cxl: fix possible null-ptr-deref in cxl_guest_init_afu|adapter()

If device_register() fails in cxl_register_afu|adapter(), the device
is not added, device_unregister() can not be called in the error path,
otherwise it will cause a null-ptr-deref because of removing not added
device.

As comment of device_register() says, it should use put_device() to give
up the reference in the error path. So split device_unregister() into
device_del() and put_device(), then goes to put dev when register fails.
Comment 1 Alexander B 2025-10-06 12:01:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100439-CVE-2022-50481-3d22@gregkh/T