CVE-2011-2723: Input Validation
First published: Fri Jul 29 2011(Updated: )
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: <a href="http://git.kernel.org/linus/17dd759c67f21e34f2156abcf415e1f60605a188">http://git.kernel.org/linus/17dd759c67f21e34f2156abcf415e1f60605a188</a> Acknowledgements: Red Hat would like to thank Brent Meshier for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <2.6.39.4 | |
| Linux Kernel | <2.6.39.4 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=726552
- http://openwall.com/lists/oss-security/2011/07/28/13
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4
- http://openwall.com/lists/oss-security/2011/07/29/1
- http://securitytracker.com/id?1025876
- http://www.securityfocus.com/bid/48929
- http://www.redhat.com/support/errata/RHSA-2011-1321.html
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=17dd759c67f21e34f2156abcf415e1f60605a188
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
- https://launchpad.net/bugs/cve/CVE-2011-2723
- http://git.kernel.org/linus/17dd759c67f21e34f2156abcf415e1f60605a188
- https://rhn.redhat.com/errata/RHSA-2011-1386.html
- https://rhn.redhat.com/errata/RHSA-2011-1350.html
- https://rhn.redhat.com/errata/RHSA-2012-0010.html
- https://rhn.redhat.com/errata/RHSA-2011-1321.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=748676
- https://rhn.redhat.com/errata/RHSA-2011-1408.html
- https://security-tracker.debian.org/tracker/CVE-2011-2723
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2723
- https://nvd.nist.gov/vuln/detail/CVE-2011-2723
- https://ubuntu.com/security/CVE-2011-2723
Frequently Asked Questions
What is the severity of CVE-2011-2723?
CVE-2011-2723 has a medium severity rating due to the potential for inconsistent fragmented packet handling.
How do I fix CVE-2011-2723?
To mitigate CVE-2011-2723, update your Linux kernel to version 2.6.39.4 or later.
Which Linux versions are affected by CVE-2011-2723?
CVE-2011-2723 affects Linux kernel versions prior to 2.6.39.4.
What is the impact of CVE-2011-2723?
The impact of CVE-2011-2723 includes possible packet loss and inconsistent state in packet fragmentation.
Is CVE-2011-2723 related to network performance?
Yes, CVE-2011-2723 can negatively affect network performance due to issues with fragmented packets.
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