kernel security update

Updated kernel packages that fix several security issues in the Red Hat
Enterprise Linux 4 kernel are now available.

This security advisory 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 security issues
described below:

* a flaw in the IPv6 implementation that allowed a local user to cause a
denial of service (infinite loop and crash) (CVE-2005-2973, important)

* a flaw in the bridge implementation that allowed a remote user to
cause forwarding of spoofed packets via poisoning of the forwarding
table with already dropped frames (CVE-2005-3272, moderate)

* a flaw in the atm module that allowed a local user to cause a denial
of service (panic) via certain socket calls (CVE-2005-3359, important)

* a flaw in the NFS client implementation that allowed a local user to
cause a denial of service (panic) via O_DIRECT writes (CVE-2006-0555,
important)

* a difference in "sysretq" operation of EM64T (as opposed to Opteron)
processors that allowed a local user to cause a denial of service
(crash) upon return from certain system calls (CVE-2006-0741 and
CVE-2006-0744, important)

* a flaw in the keyring implementation that allowed a local user to
cause a denial of service (OOPS) (CVE-2006-1522, important)

* a flaw in IP routing implementation that allowed a local user to cause
a denial of service (panic) via a request for a route for a multicast IP
(CVE-2006-1525, important)

* a flaw in the SCTP-netfilter implementation that allowed a remote user
to cause a denial of service (infinite loop) (CVE-2006-1527, important)

* a flaw in the sg driver that allowed a local user to cause a denial of
service (crash) via a dio transfer to memory mapped (mmap) IO space
(CVE-2006-1528, important)

* a flaw in the threading implementation that allowed a local user to
cause a denial of service (panic) (CVE-2006-1855, important)

* two missing LSM hooks that allowed a local user to bypass the LSM by
using readv() or writev() (CVE-2006-1856, moderate)

* a flaw in the virtual memory implementation that allowed local user to
cause a denial of service (panic) by using the lsof command
(CVE-2006-1862, important)

* a directory traversal vulnerability in smbfs that allowed a local user
to escape chroot restrictions for an SMB-mounted filesystem via "..\\"
sequences (CVE-2006-1864, moderate)

* a flaw in the ECNE chunk handling of SCTP that allowed a remote user
to cause a denial of service (panic) (CVE-2006-2271, moderate)

* a flaw in the handling of COOKIE_ECHO and HEARTBEAT control chunks of
SCTP that allowed a remote user to cause a denial of service (panic)
(CVE-2006-2272, moderate)

* a flaw in the handling of DATA fragments of SCTP that allowed a remote
user to cause a denial of service (infinite recursion and crash)
(CVE-2006-2274, moderate)


All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels
to the packages associated with their machine architectures and
configurations as listed in this erratum.

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

168791 - CVE-2006-1528 Possible local crash by dio/mmap sg driver
170772 - CVE-2005-2973 ipv6 infinite loop
171383 - CVE-2005-3272 bridge poisoning
175769 - CVE-2005-3359 incorrect inrement/decrement in atm module leads to panic
181795 - CVE-2006-0555 NFS client panic using O_DIRECT
183489 - CVE-2006-0741 bad elf entry address (CVE-2006-0744)
187841 - CVE-2006-1855 Old thread debugging causes false BUG() in choose_new_parent
188466 - CVE-2006-1522 DoS/bug in keyring code (security/keys/)
189260 - CVE-2006-1862 The lsof command triggers a kernel oops under heavy load
189346 - CVE-2006-1525 ip_route_input() panic
189435 - CVE-2006-1864 smbfs chroot issue
190460 - CVE-2006-1527 netfilter/sctp: lockup in sctp_new()
191201 - CVE-2006-2271 SCTP ECNE chunk handling DoS
191202 - CVE-2006-2272 SCTP incoming COOKIE_ECHO and HEARTBEAT packets DoS
191258 - CVE-2006-2274 SCTP DATA fragments DoS
191524 - CVE-2006-1856 LSM missing readv/writev

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2973
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3272
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3359
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0555
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0741
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0744
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1522
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1525
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1527
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1528
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1855
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1856
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1862
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1864
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2271
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2272
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2274
http://www.redhat.com/security/updates/classification/#important

kernel, nahant, update