Bug 1959673 (CVE-2021-32606)

Summary:	CVE-2021-32606 kernel: isotp_setsockopt in net/can/isotp.c allows privilege escalation via use-after-free
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
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, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, mleitner, nmurray, ptalbert, qzhao, rvrbovsk, steved, walters, wcosta, 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:	A flaw was found in the Linux kernel. A use-after-free flaw in isotp_setsockopt leads to arbitrary kernel execution by overwriting the sk_error_report() pointer which can be misused in order to execute a user-controlled ROP chain to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-13 12:05:44 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:	1959674, 1960246
Bug Blocks:	1959675

Description Marian Rehak 2021-05-12 05:01:13 UTC

The isotp_setsockopt in net/can/isotp.c allows a use-after-free. This leads to arbitrary kernel execution by overwriting the sk_error_report()
pointer, which can be misused in order to execute a user-controlled ROP chain to gain root privileges.

External Reference:

https://www.openwall.com/lists/oss-security/2021/05/11/16

Comment 1 Marian Rehak 2021-05-12 05:01:45 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1959674]