Bug 2151956 (CVE-2022-45919)

Summary:	CVE-2022-45919 kernel: use-after-free due to race condition occurring in dvb_ca_en50221.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, ahanwate, 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, nmurray, ptalbert, qzhao, rogbas, rvrbovsk, scweaver, swood, tyberry, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A race condition flaw leading to a use-after-free issue was found in the Linux kernel media subsystem in the DVB CA EN50221 interface of the DVB core device driver. It could occur in the dvb_ca_en50221_release() function if there is a disconnect after an open, because of the lack of a wait_event. A local user could use this flaw to crash the system or potentially escalate their privileges on the system.	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:	2151957, 2153019, 2153020, 2153021, 2153022
Bug Blocks:	2150349

Description Guilherme de Almeida Suckevicz 2022-12-08 17:37:45 UTC

An issue was discovered in the Linux kernel through 6.0.10. In drivers/media/dvb-core/dvb_ca_en50221.c, a use-after-free can occur is there is a disconnect after an open, because of the lack of a wait_event.

Reference and upstream patch:
https://lore.kernel.org/linux-media/20221121063308.GA33821@ubuntu/T/#u

Comment 1 Guilherme de Almeida Suckevicz 2022-12-08 17:38:11 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2151957]