Bug 2363455 (CVE-2022-49893)

Summary: CVE-2022-49893 kernel: cxl/region: Fix cxl_region leak, cleanup targets at region delete
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-01 15:05:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

cxl/region: Fix cxl_region leak, cleanup targets at region delete

When a region is deleted any targets that have been previously assigned
to that region hold references to it. Trigger those references to
drop by detaching all targets at unregister_region() time.

Otherwise that region object will leak as userspace has lost the ability
to detach targets once region sysfs is torn down.
Comment 1 Avinash Hanwate 2025-05-02 05:39:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050158-CVE-2022-49893-209a@gregkh/T