Bug 2212938 (CVE-2023-31082)

Summary:	CVE-2023-31082 kernel: sleeping function called from an invalid context in gsmld_write
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, linville, lzampier, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, steve.beattie, tyberry, vkumar, walters, wcosta, williams, wmealing, ycote
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 flaw was found when calling sleeping functions from the atomic context in the Linux kernel’s GSM MUX protocol. This flaw allows a local user to crash 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:	2212939, 2212940, 2212941, 2212942, 2212943
Bug Blocks:	2189448

Description Alex 2023-06-06 16:28:36 UTC

A flaw in the Linux Kernel found in drivers/tty/n_gsm.c. If sleeping function called from an invalid context in gsmld_write, this can lead to kernel crash.

Reference:
https://lore.kernel.org/all/CA+UBctCZok5FSQ=LPRA+A-jocW=L8FuMVZ_7MNqhh483P5yN8A@mail.gmail.com/

Patch not available yet, and previous attempt to fix was:
https://lore.kernel.org/all/20221205190806.179857803@linuxfoundation.org/

Comment 1 Alex 2023-06-06 16:29:07 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2212939]