Bug 2148517 (CVE-2022-45886)

Summary: CVE-2022-45886 kernel: use-after-free due to race condition occurring in dvb_net.c
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, allarkin, bhu, chwhite, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, lgoncalv, lleshchi, lzampier, ndegraef, nmurray, ptalbert, qzhao, rogbas, rvrbovsk, scweaver, swood, tyberry, vkumar, walters, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A race condition flaw leading to a use-after-free issue was found in the Linux kernel media subsystem in the dvb_net component of the DVB core device driver. It could occur between the time the device is disconnected (.disconnect function) and the time the device node is opened (dvb_device_open function). A local user could use this flaw to crash the system or potentially escalate their privileges on the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 2148518, Red Hat2153564, Red Hat2153565, Red Hat2153566, Red Hat2153567, Red Hat2153568, Red Hat2153569    
Bug Blocks: Embargoed2150349    

Description Guilherme de Almeida Suckevicz 2022-11-25 17:43:15 UTC 
An issue was discovered in the Linux kernel through 6.0.9. drivers/media/dvb-core/dvb_net.c has a .disconnect versus dvb_device_open race condition that leads to a use-after-free.

References:
https://lore.kernel.org/linux-media/20221115131822.6640-3-imv4bel@gmail.com/
https://lore.kernel.org/linux-media/20221115131822.6640-1-imv4bel@gmail.com/
Comment 1 Guilherme de Almeida Suckevicz 2022-11-25 17:43:38 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2148518]