Bug 1944689 (CVE-2021-29264)

Summary:	CVE-2021-29264 kernel: DoS due to negative fragment size calculation in drivers/net/ethernet/freescale/gianfar.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, 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, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, 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. The Freescale Gianfar Ethernet driver allows attackers to cause a system crash due to a negative fragment size calculated in situations involving an RX queue overrun when jumbo packets are used and NAPI is enabled. The highest threat from this vulnerability is to data integrity and system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-04-05 17:35:29 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:	1944690
Bug Blocks:	1944691

Description Guilherme de Almeida Suckevicz 2021-03-30 13:51:41 UTC

An issue was discovered in the Linux kernel through 5.11.10. drivers/net/ethernet/freescale/gianfar.c in the Freescale Gianfar Ethernet driver allows attackers to cause a system crash because a negative fragment size is calculated in situations involving an rx queue overrun when jumbo packets are used and NAPI is enabled.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d8861bab48b6c1fc3cdbcab8ff9d1eaea43afe7f

Comment 1 Guilherme de Almeida Suckevicz 2021-03-30 13:52:33 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1944690]

Comment 4 Alex 2021-03-31 17:24:40 UTC

Statement:

This flaw is rated as having Moderate impact because of the need to have privileges and both configuration with the usage of jumbo packets that is available only for the local network.

Comment 5 Product Security DevOps Team 2021-04-05 17:35:29 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-29264