Bug 2293244 (CVE-2021-47584)

Summary:	CVE-2021-47584 kernel: iocost: Fix divide-by-zero on donation from low hweight cgroup
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:	dfreiber, drow, jburrell, mbenatto, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.10.88, kernel 5.15.11, kernel 5.16	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel in the ioc_timer_fn() function, where a lack of proper controls allows for a cgroup with a hweight of 1 to donate, leaving themselves with a zero hweight after donation and causing a potential divide-by-zero error. This could lead to crashes.	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:	2293209

Description Avinash Hanwate 2024-06-20 10:55:22 UTC

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

iocost: Fix divide-by-zero on donation from low hweight cgroup

The Linux kernel CVE team has assigned CVE-2021-47584 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024061917-CVE-2021-47584-5246@gregkh/T