Bug 1375944 - (CVE-2016-7039) CVE-2016-7039 kernel: remotely triggerable unbounded recursion in the vlan gro code leading to a kernel crash
CVE-2016-7039 kernel: remotely triggerable unbounded recursion in the vlan gr...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20161010,repo...
: Security
Depends On: 1374191 1378405 1379913 1379914 1379920 1383476 1387549 1422645
Blocks: 1375945
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Reported: 2016-09-14 05:58 EDT by Adam Mariš
Modified: 2017-09-05 01:04 EDT (History)
36 users (show)

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Doc Text:
Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow issue. It could occur while receiving large packets via GRO path, as an unlimited recursion could unfold in both VLAN and TEB modules, leading to a stack corruption in the kernel.
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Last Closed: 2017-09-05 01:04:24 EDT
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2047 normal SHIPPED_LIVE Important: kernel security update 2016-10-10 23:07:15 EDT
Red Hat Product Errata RHSA-2016:2107 normal SHIPPED_LIVE Important: kernel-rt security update 2016-10-26 10:47:33 EDT
Red Hat Product Errata RHSA-2016:2110 normal SHIPPED_LIVE Important: kernel-rt security update 2016-10-26 12:21:02 EDT
Red Hat Product Errata RHSA-2017:0372 normal SHIPPED_LIVE Important: kernel-aarch64 security and bug fix update 2017-03-02 17:04:41 EST

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Description Adam Mariš 2016-09-14 05:58:40 EDT
Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow issue. It could occur while receiving large packets via GRO path; As an unlimited recursion could unfold in both VLAN and TEB modules, leading to a stack corruption in the kernel.

A remote user could use this falw to cause kernel panic by sending maliciously crafted packets to a server that has GRO enabled.

Additional requirement for attacking VLAN is to have 8021q module loaded.
Additional requirement for attacking TEB is to have increased MTU.

Upstream patch
---------------
  -> https://patchwork.ozlabs.org/patch/680412/
Comment 9 Prasad J Pandit 2016-10-10 14:08:46 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1383476]
Comment 10 errata-xmlrpc 2016-10-10 19:07:31 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2047 https://rhn.redhat.com/errata/RHSA-2016-2047.html
Comment 12 errata-xmlrpc 2016-10-26 06:47:46 EDT
This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2016:2107 https://rhn.redhat.com/errata/RHSA-2016-2107.html
Comment 13 errata-xmlrpc 2016-10-26 08:22:59 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2110 https://rhn.redhat.com/errata/RHSA-2016-2110.html
Comment 19 errata-xmlrpc 2017-03-02 12:08:24 EST
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0372 https://rhn.redhat.com/errata/RHSA-2017-0372.html

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