Bug 2035817 (CVE-2021-45469)

Summary:	CVE-2021-45469 kernel: out-of-bounds memory access in __f2fs_setxattr() in fs/f2fs/xattr.c when an inode has an invalid last xattr entry
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, allarkin, bdettelb, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An out-of-bounds memory access flaw in the Linux kernel's F2FS (Flash-Friendly File System) functionality was found in the way users mount and operate corrupted image of this file-system if an inode has an invalid last xattr entry. A local user could use this flaw to crash the system or escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-29 09:47:46 UTC	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:	2035818
Bug Blocks:	2035819

Description Guilherme de Almeida Suckevicz 2021-12-27 19:59:23 UTC

In __f2fs_setxattr in fs/f2fs/xattr.c in the Linux kernel through 5.15.11, there is an out-of-bounds memory access when an inode has an invalid last xattr entry.

References:
https://bugzilla.kernel.org/show_bug.cgi?id=215235
http://www.openwall.com/lists/oss-security/2021/12/25/1

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?h=dev&id=5598b24efaf4892741c798b425d543e4bed357a1

Comment 1 Guilherme de Almeida Suckevicz 2021-12-27 20:00:07 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2035818]

Comment 3 Product Security DevOps Team 2021-12-29 09:47:42 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-45469