Bug 2266501 (CVE-2021-46954)

Summary:	CVE-2021-46954 kernel: net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets
Product:	[Other] Security Response	Reporter:	Nick Tait <ntait>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
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, scweaver, sukulkar, tglozar, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2266502
Bug Blocks:	2266459

Description Nick Tait 2024-02-27 23:50:29 UTC

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

net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets

The Linux kernel CVE team has assigned CVE-2021-46954 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024022715-CVE-2021-46954-b856@gregkh/T/#u

Comment 1 Nick Tait 2024-02-27 23:51:08 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266502]

Comment 6 Justin M. Forbes 2024-02-28 18:54:14 UTC

This was fixed for Fedora with the 5.12.3 stable kernel update.

Comment 8 Alex 2024-06-09 16:16:46 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-46954 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags REMOTE READ KASAN OOB INIT NETWORK SKB  ; 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.