Moderate: kernel security update

Updated kernel packages that fix a number of security issues as well as
other bugs are now available for Red Hat Enterprise Linux 2.1 (32 bit
architectures)

This security advisory has been rated as having moderate 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 ATM subsystem affecting systems with installed ATM hardware
and configured ATM support that allowed a remote user to cause a denial of
service (panic) by accessing socket buffer memory after it has been freed
(CVE-2006-4997, Moderate)

* a flaw in the DVD handling of the CDROM driver that could be used
together with a custom built USB device to gain root privileges
(CVE-2006-2935, Moderate)

In addition to the security issues described above, the following bugs are
also addressed:

* a potential overflow condition when reading /proc/devices
* uninitialized memory in cdrom_init() that can lead to a crash at install time
* a potential page corruption bug in /proc/kcore
* a race condition when reading vmalloc()ed regions via /proc/kcore

All Red Hat Enterprise Linux 2.1 users are advised to upgrade their kernels
to these updated packages, which contain backported fixes to correct these
issues.

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

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

102095 - Panic occurs at the time of installation.
147666 - Memory corruption when reading /proc/kcore
156029 - kernel may oops if more than 4k worth of string data returned in /proc/devices
197673 - CVE-2006-2935 Possible buffer overflow in DVD handling
207306 - CVE-2006-4997 IP over ATM clip_mkip dereference freed pointer
213567 - Access to unmapped vmalloc pages when reading proc/kcore

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2935
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4997
http://www.redhat.com/security/updates/classification/#moderate