Bug 1992774 (CVE-2021-38205)

Summary:	CVE-2021-38205 kernel: drivers/net/ethernet/xilinx/xilinx_emaclite.c prints the real IOMEM pointer
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, 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:	kernel 5.14-rc1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel that allows attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer). The highest threat from this vulnerability is to confidentiality.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-08-16 13:28:45 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:	1992776
Bug Blocks:	1992775

Description Guilherme de Almeida Suckevicz 2021-08-11 17:52:02 UTC

A flaw in the Linux kernels XILINX driver leaked a kernel pointer to userspace allowing an attacker to use this a part of reconnaissance to defeat kernel level protections.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d0d62baa7f505bd4c59cd169692ff07ec49dde37

Comment 1 Guilherme de Almeida Suckevicz 2021-08-11 17:53:08 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992776]

Comment 2 Justin M. Forbes 2021-08-12 13:27:26 UTC

This was fixed for Fedora with the 5.13.4 stable kernel updates.

Comment 6 juneau 2021-08-16 12:44:43 UTC

Marking services notaffected per kernel analysis.

Comment 7 Product Security DevOps Team 2021-08-16 13:28:45 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-2021-38205