Important: kernel security and bug fix update

Updated kernel packages that fix security issues and bugs in the Red Hat
Enterprise Linux 5 kernel are now available.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the following security issues:

* a flaw in the handling of IPv6 type 0 routing headers that allowed remote
users to cause a denial of service that led to a network amplification
between two routers (CVE-2007-2242, Important).

* a flaw in the nfnetlink_log netfilter module that allowed a local user to
cause a denial of service (CVE-2007-1496, Important).

* a flaw in the flow list of listening IPv6 sockets that allowed a local
user to cause a denial of service (CVE-2007-1592, Important).

* a flaw in the handling of netlink messages that allowed a local user to
cause a denial of service (infinite recursion) (CVE-2007-1861, Important).

* a flaw in the IPv4 forwarding base that allowed a local user to cause an
out-of-bounds access (CVE-2007-2172, Important).

* a flaw in the nf_conntrack netfilter module for IPv6 that allowed remote
users to bypass certain netfilter rules using IPv6 fragments
(CVE-2007-1497, Moderate).

In addition to the security issues described above, fixes for the following
have been included:

* a regression in ipv6 routing.

* an error in memory initialization that caused gdb to output inaccurate
backtraces on ia64.

* the nmi watchdog timeout was updated from 5 to 30 seconds.

* a flaw in distributed lock management that could result in errors during
virtual machine migration.

* an omitted include in kernel-headers that led to compile failures for
some packages.

Red Hat Enterprise Linux 5 users are advised to upgrade to these packages,
which contain backported patches to correct these issues.

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

238046 - oops and panics bringing up/down interfaces on 128p Altix, 8 interfaces
238731 - dlm locking error from gfs dio/aio during virt machine migration
238749 - The patch "xen: Add PACKET_AUXDATA cmsg" cause /usr/include/linux/if_packet.h broken
238944 - CVE-2007-1592 IPv6 oops triggerable by any user
238946 - CVE-2007-1496 Various NULL pointer dereferences in netfilter code
238947 - CVE-2007-1497 IPv6 fragments bypass in nf_conntrack netfilter code
238948 - CVE-2007-2172 fib_semantics.c out of bounds access vulnerability
238949 - CVE-2007-2242 IPv6 routing headers issue
238960 - CVE-2007-1861 infinite recursion in netlink

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1496
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1497
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1592
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1861
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2172
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2242
http://www.redhat.com/security/updates/classification/#important