Bug 2244712 (CVE-2023-40791)

Summary:	CVE-2023-40791 kernel: lib/scatterlist.c fails to unpin pages
Product:	[Other] Security Response	Reporter:	Robb Gatica <rgatica>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jpoimboe, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mstowell, nmurray, ptalbert, rogbas, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An unreleased memory page flaw (unpinned) was found in extract_user_to_sg in the lib/scatterlist.c function of the Linux kernel. This flaw allows a local user, or potentially remote 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:	2244713
Bug Blocks:	2244710

Description Robb Gatica 2023-10-17 22:30:29 UTC

CVE-2023-40791

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extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.12 fails to unpin pages in a certain situation, as demonstrated by a WARNING for try_grab_page.

https://lkml.org/lkml/2023/8/3/323
https://lore.kernel.org/linux-crypto/20571.1690369076@warthog.procyon.org.uk/
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f443fd5af5dbd531f880d3645d5dd36976cf087f

Comment 1 Robb Gatica 2023-10-17 22:30:53 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2244713]

Comment 2 Justin M. Forbes 2023-10-18 13:42:54 UTC

This was fixed for Fedora with the 6.4.12 stable kernel updates.