Bug 1410370 (CVE-2016-9754)

Summary:	CVE-2016-9754 kernel: Integer overflow in ring_buffer_resize()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aquini, bhu, dhoward, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, mchehab, mcressma, nmurray, pholasek, rt-maint, rvrbovsk, slawomir, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.6.1	Doc Type:	If docs needed, set a value
Doc Text:	An integer overflow vulnerability was found in the ring_buffer_resize() calculations in which a privileged user can adjust the size of the ringbuffer message size. These calculations can create an issue where the kernel memory allocator will not allocate the correct count of pages yet expect them to be usable. This can lead to the ftrace() output to appear to corrupt kernel memory and possibly be used for privileged escalation or more likely kernel panic.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:51:59 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:
Bug Blocks:	1410372

Description Adam Mariš 2017-01-05 10:45:45 UTC

An integer overflow vulnerability in ring_buffer_resize() calculations in which a privileged user can adjust the size of the ringbuffer message size.   These calculations can create an issue where the kernel memory allocator will not allocate the correct count of pages yet expect them to be usable.  This can lead to the ftrace() output to appear to corrupt kernel memory and possibly be used for privileged escalation or more likely kernel panic.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=59643d1535eb220668692a5359de22545af579f6

Reference:

https://source.android.com/security/bulletin/2017-01-01.html#eop-in-kernel-profiling-subsystem

Comment 2 Wade Mealing 2017-01-19 05:17:05 UTC

Statement:

This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 kernels.