Bug 726552 - (CVE-2011-2723) CVE-2011-2723 kernel: gro: only reset frag0 when skb can be pulled
CVE-2011-2723 kernel: gro: only reset frag0 when skb can be pulled
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
public=20110727,reported=20110729,sou...
: Security
Depends On: 679682 726553 726554 726555 726556 734971 748676 761340
Blocks: 726551
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Reported: 2011-07-28 21:26 EDT by Eugene Teo (Security Response)
Modified: 2016-11-08 11:05 EST (History)
13 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-05-10 04:15:15 EDT
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Description Eugene Teo (Security Response) 2011-07-28 21:26:39 EDT
Currently skb_gro_header_slow unconditionally resets frag0 and frag0_len.  However, when we can't pull on the skb this leaves the GRO fields in an inconsistent state.

This patch fixes this by only resetting those fields after the pskb_may_pull test.

Upstream commit:
http://git.kernel.org/linus/17dd759c67f21e34f2156abcf415e1f60605a188

Acknowledgements:
Red Hat would like to thank Brent Meshier for reporting this issue.
Comment 4 Eugene Teo (Security Response) 2011-07-28 21:40:47 EDT
Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 as it did not backport the upstream commit a5b1cf28 that introduced this issue. This has been addressed in Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1386.html, https://rhn.redhat.com/errata/RHSA-2011-1350.html, and https://rhn.redhat.com/errata/RHSA-2012-0010.html.
Comment 7 Vincent Danen 2011-09-20 12:38:24 EDT
Acknowledgements:

Red Hat would like to thank Brent Meshier for reporting this issue.
Comment 8 Vincent Danen 2011-09-20 12:39:18 EDT
External References:

http://git.kernel.org/linus/17dd759c67f21e34f2156abcf415e1f60605a188
Comment 9 errata-xmlrpc 2011-09-20 13:50:53 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5.6.Z - Server Only

Via RHSA-2011:1321 https://rhn.redhat.com/errata/RHSA-2011-1321.html
Comment 10 errata-xmlrpc 2011-10-05 17:47:35 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:1350 https://rhn.redhat.com/errata/RHSA-2011-1350.html
Comment 11 errata-xmlrpc 2011-10-20 13:28:32 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1386 https://rhn.redhat.com/errata/RHSA-2011-1386.html
Comment 12 Eugene Teo (Security Response) 2011-10-24 23:51:03 EDT
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 748676]
Comment 13 errata-xmlrpc 2011-10-26 11:32:40 EDT
This issue has been addressed in following products:

  RHEV-H, V2V and Agents for RHEL-5

Via RHSA-2011:1408 https://rhn.redhat.com/errata/RHSA-2011-1408.html
Comment 15 errata-xmlrpc 2012-01-10 15:15:52 EST
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2012:0010 https://rhn.redhat.com/errata/RHSA-2012-0010.html

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