Bug 2283386 (CVE-2021-47563)

Summary:	CVE-2021-47563 kernel: ice: avoid bpf_prog refcount underflow
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, rkeshri, 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:	kernel 5.10.83, kernel 5.15.6, kernel 5.16	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's ice driver, where the add_pble_prm function improperly manages the reference counting of the bpf_prog object. This issue occurs during the VSI rebuild process, causing a reference count underflow when an old program is mistakenly decremented while still in use, which leads to a system crash.	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:	2283496

Description ybuenos 2024-05-27 09:30:01 UTC

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

ice: avoid bpf_prog refcount underflow

The Linux kernel CVE team has assigned CVE-2021-47563 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052452-CVE-2021-47563-008a@gregkh/T

Comment 2 Alex 2024-06-09 15:44:13 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47563 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags REMOTE BPF NETWORK  ; 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.