Bug 2266588 (CVE-2021-47017)

Summary:	CVE-2021-47017 kernel: use after free in ath10k_htc_send_bundle
Product:	[Other] Security Response	Reporter:	Rohit Keshri <rkeshri>
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:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in ath10k_htc_send_bundle in ath10k in the Linux Kernel.	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:	2266589
Bug Blocks:	2266587

Description Rohit Keshri 2024-02-28 12:33:50 UTC

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

ath10k: Fix a use after free in ath10k_htc_send_bundle

In ath10k_htc_send_bundle, the bundle_skb could be freed by
dev_kfree_skb_any(bundle_skb). But the bundle_skb is used later
by bundle_skb->len.

As skb_len = bundle_skb->len, my patch replaces bundle_skb->len to
skb_len after the bundle_skb was freed.

https://git.kernel.org/stable/c/3b1ac40c6012140828caa79e592a438a18ebf71b
https://git.kernel.org/stable/c/5e413c0831ff4700d1739db3fa3ae9f859744676
https://git.kernel.org/stable/c/8392df5d7e0b6a7d21440da1fc259f9938f4dec3
https://git.kernel.org/stable/c/8bb054fb336f4250002fff4e0b075221c05c3c65

Comment 1 Rohit Keshri 2024-02-28 12:36:33 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266589]

Comment 3 Justin M. Forbes 2024-02-28 18:50:48 UTC

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

Comment 4 Alex 2024-06-09 15:11:17 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47017 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags REMOTE SIMPLEFIX UAF SKB  ; these flags parsed automatically based on patche 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.