Bug 2213485 (CVE-2023-3161)

Summary:	CVE-2023-3161 kernel: fbcon: shift-out-of-bounds in fbcon_set_font()
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
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, lzampier, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, tyberry, vkumar, walters, wcosta, williams, wmealing, ycote
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 6.2-rc7	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing a font->width and font->height greater than 32 to the fbcon_set_font, since there are no checks in place, a shift-out-of-bounds occurs, leading to undefined behavior and possible denial of service.	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:	2213490, 2213491, 2213492, 2213493, 2213494, 2233507, 2233508
Bug Blocks:	2213488

Description Mauro Matteo Cascella 2023-06-08 10:47:23 UTC

A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing font->width and font->height greater than 32 to fbcon_set_font, since there are no checks in place, a shift-out-of-bounds occurs leading to undefined behavior and possible denial of service.

Upstream fix:
https://github.com/torvalds/linux/commit/2b09d5d364986f724f17001ccfe4126b9b43a0be

Comment 1 Mauro Matteo Cascella 2023-06-08 10:59:48 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2213490]

Comment 3 Justin M. Forbes 2023-06-09 14:34:10 UTC

This was fixed for Fedora with the 6.1.11 stable kernel updates.

Comment 7 errata-xmlrpc 2023-10-10 15:25:02 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2023:5603 https://access.redhat.com/errata/RHSA-2023:5603

Comment 8 errata-xmlrpc 2023-10-10 15:33:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2023:5604 https://access.redhat.com/errata/RHSA-2023:5604

Comment 9 errata-xmlrpc 2023-11-07 08:20:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:6583 https://access.redhat.com/errata/RHSA-2023:6583

Comment 10 errata-xmlrpc 2023-11-14 15:15:36 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:6901 https://access.redhat.com/errata/RHSA-2023:6901

Comment 11 errata-xmlrpc 2023-11-14 15:20:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:7077 https://access.redhat.com/errata/RHSA-2023:7077

Comment 12 errata-xmlrpc 2024-01-24 16:43:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0412 https://access.redhat.com/errata/RHSA-2024:0412