Bug 2174866 (CVE-2023-23039)

Summary:	CVE-2023-23039 kernel: tty: vcc: race condition leading to use-after-free in vcc_open()
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, bhu, chwhite, crwood, ddepaula, debarbos, dfreiber, dhoward, dvlasenk, ezulian, fhrbata, hkrzesin, jarod, jburrell, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rogbas, rvrbovsk, scweaver, 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 leading to a use-after-free vulnerability was found in the Linux kernel's Sun Virtual Console Concentrator (VCC). This issue can result in a system crash or potential code execution if a physically proximate attacker removes a VCC device while calling open().	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-03-02 14:20:31 UTC	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:	2174867
Bug Blocks:	2172634

Description Mauro Matteo Cascella 2023-03-02 14:18:31 UTC

A race condition leading to use-after-free may occur if the user physically removes the vcc device while calling open().

Upstream patch (not yet merged upstream):
https://lore.kernel.org/lkml/20230102010528.2868403-1-yoochan1026@gmail.com/

Comment 1 Mauro Matteo Cascella 2023-03-02 14:18:58 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2174867]

Comment 2 Justin M. Forbes 2023-03-14 19:00:08 UTC

This is not enabled on Fedora kernels.