Bug 1400019 (CVE-2016-8655) - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free
Summary: CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-8655
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1401820 Engineering1401852 Engineering1401853 Engineering1401854 Engineering1401855 Engineering1401856 Engineering1401857
Blocks: Embargoed1400022
TreeView+ depends on / blocked
 
Reported: 2016-11-30 10:02 UTC by Adam Mariš
Modified: 2021-02-05 18:54 UTC (History)
37 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system.
Clone Of:
Environment:
Last Closed: 2017-09-05 05:04:33 UTC

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:0386 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-03-02 22:06:10 UTC
Red Hat Product Errata RHSA-2017:0387 0 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-03-02 22:06:22 UTC
Red Hat Product Errata RHSA-2017:0402 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-03-02 21:04:05 UTC

Description Adam Mariš 2016-11-30 10:02:22 UTC 
A race condition vulnerability was found in packet_set_ring that can lead to use after free on a function pointer. This vulnerability can be used to gain kernel code execution for the local attacker capable of creating AF_PACKET sockets. This issue was introduced with following commit:

https://github.com/torvalds/linux/commit/f6fb8f100b807378fda19e83e5ac6828b638603a
Comment 1 Adam Mariš 2016-11-30 10:02:36 UTC 
Acknowledgments:

Name: Philip Pettersson
Comment 4 Andrej Nemec 2016-12-06 08:10:58 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1401820]
Comment 5 Andrej Nemec 2016-12-06 08:11:21 UTC 
Public via:

http://seclists.org/oss-sec/2016/q4/607
Comment 6 Adam Mariš 2016-12-06 08:12:51 UTC 
Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
Comment 7 Petr Matousek 2016-12-06 09:15:16 UTC 
Statement:

This issue does not affect Red Hat Enterprise Linux 5 and 6.

This issue does affect Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future updates for the respective releases will address this issue.

In a default or common use of Red Hat Enterprise Linux 7 this issue does not allow an unprivileged local user elevate their privileges on the system.

In order to exploit this issue the attacker needs CAP_NET_RAW capability, which needs to be granted by the administrator to the attacker's account. Since Red Hat Enterprise Linux 7 does not have unprivileged user namespaces enabled by default, local unprivileged users also cannot abuse namespaces to grant this capability to themselves and elevate their privileges.
Comment 22 dafox7777777 2017-01-24 08:52:34 UTC 
bump
Comment 23 errata-xmlrpc 2017-03-02 16:04:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:0402 https://rhn.redhat.com/errata/RHSA-2017-0402.html
Comment 24 errata-xmlrpc 2017-03-02 17:16:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0386 https://rhn.redhat.com/errata/RHSA-2017-0386.html
Comment 25 errata-xmlrpc 2017-03-02 17:25:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0387 https://rhn.redhat.com/errata/RHSA-2017-0387.html
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