Bug 1449980 (CVE-2017-8831)

Summary:	CVE-2017-8831 kernel: Double fetch vulnerability in saa7164_bus_get function
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, gscott, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, vdronov, 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:	The saa7164_bus_get function in drivers/media/pci/saa7164/saa7164-bus.c in the Linux kernel allows users able to plant rogue PCI device on the system to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact by changing a certain sequence-number value, aka a "double fetch" vulnerability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-18 12:38:01 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:	1449981, 1452150
Bug Blocks:	1449984

Description Adam Mariš 2017-05-11 09:45:36 UTC

The saa7164_bus_get function in drivers/media/pci/saa7164/saa7164-bus.c in the Linux kernel through 4.10.14 allows local users to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact by changing a certain sequence-number value, aka a "double fetch" vulnerability.

Bug report:

https://bugzilla.kernel.org/show_bug.cgi?id=195559

Proposed patch:

https://bugzilla.kernel.org/show_bug.cgi?id=195559#c2

Comment 1 Adam Mariš 2017-05-11 09:46:25 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1449981]

Comment 4 Vladis Dronov 2017-05-18 12:38:01 UTC

Statement:

This issue does not affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, as the code with the flaw is not present in this product.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 6 Andrej Nemec 2017-06-26 08:40:31 UTC

References:

http://seclists.org/bugtraq/2017/Jun/47

Comment 7 Justin M. Forbes 2018-01-29 17:24:00 UTC

This was fixed for Fedora with the 4.12.6 stable updates