CVE-2011-2723

Severity: medium (CVSS 5.7 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-09-06 · updated 2026-06-16
Weakness: CWE-20

Description

The skb_gro_header_slow function in include/linux/netdevice.h in the Linux kernel before 2.6.39.4, when Generic Receive Offload (GRO) is enabled, resets certain fields in incorrect situations, which allows remote attackers to cause a denial of service (system crash) via crafted network traffic.

Affected products

Linux kernel: before 2.6.39.4 — fixed in 2.6.39.4

How to fix

Upgrade to a fixed version: Linux kernel 2.6.39.4. Check the vendor advisory for mitigations.

References

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
http://openwall.com/lists/oss-security/2011/07/28/13
http://openwall.com/lists/oss-security/2011/07/29/1
http://securitytracker.com/id?1025876
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4
http://www.redhat.com/support/errata/RHSA-2011-1321.html
http://www.securityfocus.com/bid/48929
https://bugzilla.redhat.com/show_bug.cgi?id=726552
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
http://openwall.com/lists/oss-security/2011/07/28/13

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