Bug 2272777 (CVE-2024-26658)

Summary:	CVE-2024-26658 kernel: bcachefs: grab s_umount only if snapshotting
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, 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 6.7.5, kernel 6.8	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the bcachefs Linux kernel module which allows to a circular locking dependency, triggering a deadlock scenario during snapshot creation operations. This occurred due to the unconditional acquisition of s_umount in __bch2_ioctl_subvolume_create(), conflicting with existing locks held by other threads which leads to a deadlock situations.	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:	2272778
Bug Blocks:	2272924

Description Mauro Matteo Cascella 2024-04-02 23:01:24 UTC

In the Linux kernel, the following vulnerability has been resolved:

bcachefs: grab s_umount only if snapshotting

The Linux kernel CVE team has assigned CVE-2024-26658 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024040222-CVE-2024-26658-1451@gregkh/T

Comment 1 Mauro Matteo Cascella 2024-04-02 23:02:01 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2272778]

Comment 5 Justin M. Forbes 2024-04-03 16:55:09 UTC

This was fixed for Fedora with the 6.7.5 stable kernel updates.

Comment 6 Alex 2024-06-09 13:13:43 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2024-26658 is: 	SKIP	No affected files built, so skip this CVE	NO			-	-	unknown (where first YES/NO value means if related sources built).