Bug 1403145 (CVE-2016-9576)

Summary:	CVE-2016-9576 kernel: Use after free in SCSI generic device interface
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	afox, aquini, arm-mgr, bhu, dhoward, fhrbata, gansalmon, hannsj_uhl, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kabbott, kbost, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, rt-maint, rvrbovsk, sardella, slawomir, vdronov, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that the blk_rq_map_user_iov() function in the Linux kernel's block device implementation did not properly restrict the type of iterator, which could allow a local attacker to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging write access to a /dev/sg device.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:04:08 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:	1403146, 1414823, 1414834, 1414835, 1414836, 1414837
Bug Blocks:	1403147

Description Adam Mariš 2016-12-09 08:40:42 UTC

Use-after-free vulnerability in SCSI generic device interface has been reported which allows kernel memory read/write when having access to /dev/sg* SCSI generic devices. This issue affects versions of Linux down to 2.6. This was assigned CVE-2016-9576.

Initial message:

https://www.spinics.net/lists/linux-scsi/msg102232.html

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a0ac402cfcdc904f9772e1762b3fda112dcc56a0

Oss-security post:

http://seclists.org/oss-sec/2016/q4/644

Later an additional fix was developed, it was assigned CVE-2016-10088, see:

https://bugzilla.redhat.com/show_bug.cgi?id=1412210

Comment 1 Adam Mariš 2016-12-09 08:42:13 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1403146]

Comment 8 Vladis Dronov 2017-01-19 15:22:47 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code which can trigger the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

Comment 11 errata-xmlrpc 2017-03-21 13:46:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0817 https://rhn.redhat.com/errata/RHSA-2017-0817.html

Comment 13 errata-xmlrpc 2017-08-01 19:11:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077

Comment 14 errata-xmlrpc 2017-08-02 07:51:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842

Comment 15 errata-xmlrpc 2017-09-06 20:39:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669