Bug 2266371 (CVE-2021-46916)

Summary:	CVE-2021-46916 kernel: NULL pointer dereference in ethtool loopback test
Product:	[Other] Security Response	Reporter:	Rohit Keshri <rkeshri>
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, rysulliv, scweaver, 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 NULL pointer dereference flaw was found in ethtool loopback test in the Linux Kernel. This issue occurs due to a missing q_vector associated with the test ring when it is setup, as interrupts are not normally added to the test rings.	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:	2266381
Bug Blocks:	2266369

Description Rohit Keshri 2024-02-27 17:35:14 UTC

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

ixgbe: Fix NULL pointer dereference in ethtool loopback test

The ixgbe driver currently generates a NULL pointer dereference when
performing the ethtool loopback test. This is due to the fact that there
isn't a q_vector associated with the test ring when it is setup as
interrupts are not normally added to the test rings.

To address this I have added code that will check for a q_vector before
returning a napi_id value. If a q_vector is not present it will return a
value of 0.

https://git.kernel.org/stable/c/31166efb1cee348eb6314e9c0095d84cbeb66b9d
https://git.kernel.org/stable/c/758d19098df4b0bbca9f40d6ae6c82c9c18b9bba

Comment 1 Rohit Keshri 2024-02-27 17:54:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266381]

Comment 3 Justin M. Forbes 2024-02-27 18:24:47 UTC

This was fixed for Fedora with the 5.11.16 stable kernel update.