Bug 1439740 (CVE-2016-10229)

Summary:	CVE-2016-10229 kernel: net: Unsafe second checksum calculation in udp.c
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kent, kernel-maint, kernel-mgr, kolshanov, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, mjc, nmurray, pasik, pholasek, plougher, rt-maint, rvrbovsk, slawomir, williams, wmealing
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 Linux kernel allows remote attackers to execute arbitrary code via UDP traffic that triggers an unsafe second checksum calculation during execution of a recv system call with the MSG_PEEK flag. This may create a kernel panic or memory corruption leading to privilege escalation.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-04-19 22:10:10 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:	1440624
Bug Blocks:	1439743

Description Andrej Nemec 2017-04-06 12:52:24 UTC

A flaw was found in the Linux kernel which allows remote attackers to crash the system or corrupt kernel memory, possibly leading to arbitrary code execution, via UDP traffic that triggers an unsafe second checksum calculation during the execution of a recv system call with the MSG_PEEK flag.

Upstream patch:

https://github.com/torvalds/linux/commit/197c949e7798fbf28cfadc69d9ca0c2abbf93191

References:

http://source.android.com/security/bulletin/2017-04-01.html

Comment 1 Wade Mealing 2017-04-10 06:58:04 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1440624]

Comment 2 Justin M. Forbes 2017-04-10 14:13:44 UTC

This fix was committed upstream in the 4.5 kernel merge window (Dec 2015). It has never impacted any of the currently supported versions of Fedora.

Comment 3 Wade Mealing 2017-04-11 00:50:22 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code that introduced the flaw is not present in these products.

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, Red Hat Enterprise MRG 2, and realtime kernels as these contain the fixed commit.

Comment 7 Vincent Danen 2017-04-19 22:10:10 UTC

External References:

https://access.redhat.com/solutions/3001781