Bug 2274609 (CVE-2021-47200)

Summary: CVE-2021-47200 kernel: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap
Product: [Other] Security Response Reporter: Marco Benatto <mbenatto>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sidakwo, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 5.15.5, kernel 5.16 Doc Type: If docs needed, set a value
Doc Text:
A use after free law was found in drivers/gpu/drm/drm_prime.c in the Linux kernel, occuring in mmap with drm_gem_ttm_mmap.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2274637    

Description Marco Benatto 2024-04-11 21:00:00 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap

The Linux kernel CVE team has assigned CVE-2021-47200 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024041037-CVE-2021-47200-ae55@gregkh/T
Comment 3 Alex 2024-06-09 15:20:27 UTC 
The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47200 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags READ UAF IMPROVEONLY  ; these flags parsed automatically based on patche data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.