Bug 2282357 (CVE-2021-47383)

Summary:	CVE-2021-47383 kernel: tty: Fix out-of-bound vmalloc access in imageblit
Product:	[Other] Security Response	Reporter:	ybuenos
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, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mbenatto, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, scweaver, sidakwo, sukulkar, tglozar, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.4.286, kernel 4.9.285, kernel 4.14.249, kernel 4.19.209, kernel 5.4.151, kernel 5.10.71, kernel 5.14.10, kernel 5.15	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's tty subsystem within the imageblit function when a userspace program performs an ioctl operation with the FBIOPUT_VSCREENINFO command, passing a fb_var_screeninfo structure with limited fields. If the structure’s values remain unchanged from a previous ioctl call, the kernel fails to fully update the screen information, leading to incorrect calculations of screen dimensions potentially causing system crashes or instability.	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:
Bug Blocks:	2282406

Description ybuenos 2024-05-22 09:19:34 UTC

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

tty: Fix out-of-bound vmalloc access in imageblit

The Linux kernel CVE team has assigned CVE-2021-47383 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052144-CVE-2021-47383-a8f4@gregkh/T

Comment 5 Alex 2024-06-09 15:42:31 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47383 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags WRITE OOB PRINTF-TTY  ; these flags parsed automatically based on patche data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.

Comment 135 errata-xmlrpc 2024-08-14 00:16:49 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:5365 https://access.redhat.com/errata/RHSA-2024:5365

Comment 136 errata-xmlrpc 2024-08-14 00:37:16 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:5364 https://access.redhat.com/errata/RHSA-2024:5364

Comment 137 errata-xmlrpc 2024-09-24 00:36:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:7001 https://access.redhat.com/errata/RHSA-2024:7001

Comment 138 errata-xmlrpc 2024-09-24 02:30:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:7000 https://access.redhat.com/errata/RHSA-2024:7000

Comment 139 errata-xmlrpc 2024-10-30 01:26:27 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:8617 https://access.redhat.com/errata/RHSA-2024:8617