Bug 2282896 (CVE-2021-47461)

Summary:	CVE-2021-47461 kernel: userfaultfd: fix a race between writeprotect and exit_mmap()
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, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sidakwo, sukulkar, tglozar, trathi, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.10.76, kernel 5.14.15, kernel 5.15	Doc Type:	If docs needed, set a value
Doc Text:	A possible race condition flaw was found in the Linux kernel. When a process exits, its virtual memory areas (VMAs) are removed by exit_mmap(), and at the same time, userfaultfd_writeprotect() is called.	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:	2283370

Description ybuenos 2024-05-23 09:33:30 UTC

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

userfaultfd: fix a race between writeprotect and exit_mmap()

The Linux kernel CVE team has assigned CVE-2021-47461 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052225-CVE-2021-47461-a472@gregkh/T

Comment 3 Alex 2024-06-09 16:09:08 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47461 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is an approximation based on flags READ KASAN DISK SIMPLEFIX RACE  ; these flags parsed automatically based on patch 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 11 errata-xmlrpc 2024-08-08 04:44:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:5102 https://access.redhat.com/errata/RHSA-2024:5102

Comment 12 errata-xmlrpc 2024-08-08 04:56:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:5101 https://access.redhat.com/errata/RHSA-2024:5101

Comment 13 errata-xmlrpc 2024-09-04 07:19:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2024:6297 https://access.redhat.com/errata/RHSA-2024:6297

Comment 15 errata-xmlrpc 2024-11-26 00:48:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:10262 https://access.redhat.com/errata/RHSA-2024:10262