Bug 2267012 (CVE-2021-47044)

Summary:	CVE-2021-47044 kernel: sched/fair: Fix shift-out-of-bounds in load_balance()
Product:	[Other] Security Response	Reporter:	Avinash Hanwate <ahanwate>
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 5.10.37, kernel 5.11.21, kernel 5.12.4, kernel 5.13	Doc Type:	If docs needed, set a value
Doc Text:	A shift-out-of-bounds vulnerability was found in the Linux kernel, which affects the load_balance() function in the sched/fair component, and is caused when the to-be-active-balanced task is not allowed to run on env->dst_cpu, allowing the sd->nr_balance_failed value to grow exceedingly large.	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:	2267013
Bug Blocks:	2267020

Description Avinash Hanwate 2024-02-29 10:33:38 UTC

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

sched/fair: Fix shift-out-of-bounds in load_balance()

The Linux kernel CVE team has assigned CVE-2021-47044 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024022839-CVE-2021-47044-2e16@gregkh/T/#u

Comment 1 Avinash Hanwate 2024-02-29 10:34:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2267013]

Comment 5 Justin M. Forbes 2024-02-29 17:33:06 UTC

This was fixed for Fedora with the 5.12.4 stable kernel updates.

Comment 6 Alex 2024-06-09 13:06:51 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47044 is: 	SKIP	The Fixes patch not applied yet, so unlikely that actual: 5a7f555904671c0737819fe4d19bd6143de3f6c0	YES			NO	YES	unknown (where first YES/NO value means if related sources built).