Technical Description

A vulnerability has been identified in Linux Kernel, which could be exploited by local attackers to cause a denial of service. This issue is due to an error in the "tcp_v6_syn_recv_soc()" [net/ipv6/tcp_ipv6.c] function where the IPv6 flow list (ipv6_fl_socklist) is shared with child sockets, which could be exploited by malicious users to crash an affected system by manipulating listening IPv6 TCP sockets.

Affected Products

Linux Kernel versions 2.6.x
Linux Kernel versions 2.4.x

Solution

Upgrade to Linux Kernel version 2.4.34.2 or 2.6.20.4 :
http://www.kernel.org

References

http://www.vupen.com/english/advisories/2007/1084
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233478
http://www.kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.34.2
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.4

Credits

Vulnerability reported by Masayuki Nakagawa

ChangeLog

2007-03-23 : Initial release

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