Bug 2320449 (CVE-2024-49865)

Summary: CVE-2024-49865 kernel: drm/xe/vm: move xa_alloc to prevent UAF
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
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2320819    
Bug Blocks:    

Description OSIDB Bzimport 2024-10-21 19:02:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/xe/vm: move xa_alloc to prevent UAF

Evil user can guess the next id of the vm before the ioctl completes and
then call vm destroy ioctl to trigger UAF since create ioctl is still
referencing the same vm. Move the xa_alloc all the way to the end to
prevent this.

v2:
 - Rebase

(cherry picked from commit dcfd3971327f3ee92765154baebbaece833d3ca9)
Comment 1 Robb Gatica 2024-10-21 22:42:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102113-CVE-2024-49865-ae89@gregkh/T