Important: kernel security and bug fix update

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

* A flaw was found in the sctp_icmp_proto_unreachable() function in the
Linux kernel's Stream Control Transmission Protocol (SCTP) implementation.
A remote attacker could use this flaw to cause a denial of service.
(CVE-2010-4526, Important)

* A missing boundary check was found in the dvb_ca_ioctl() function in the
Linux kernel's av7110 module. On systems that use old DVB cards that
require the av7110 module, a local, unprivileged user could use this flaw
to cause a denial of service or escalate their privileges. (CVE-2011-0521,
Important)

* A race condition was found in the way the Linux kernel's InfiniBand
implementation set up new connections. This could allow a remote user to
cause a denial of service. (CVE-2011-0695, Important)

* A heap overflow flaw in the iowarrior_write() function could allow a
user with access to an IO-Warrior USB device, that supports more than 8
bytes per report, to cause a denial of service or escalate their
privileges. (CVE-2010-4656, Moderate)

* A flaw was found in the way the Linux Ethernet bridge implementation
handled certain IGMP (Internet Group Management Protocol) packets. A local,
unprivileged user on a system that has a network interface in an Ethernet
bridge could use this flaw to crash that system. (CVE-2011-0716, Moderate)

* A NULL pointer dereference flaw was found in the Generic Receive Offload
(GRO) functionality in the Linux kernel's networking implementation. If
both GRO and promiscuous mode were enabled on an interface in a virtual LAN
(VLAN), it could result in a denial of service when a malformed VLAN frame
is received on that interface. (CVE-2011-1478, Moderate)

* A missing initialization flaw in the Linux kernel could lead to an
information leak. (CVE-2010-3296, Low)

* A missing security check in the Linux kernel's implementation of the
install_special_mapping() function could allow a local, unprivileged user
to bypass the mmap_min_addr protection mechanism. (CVE-2010-4346, Low)

* A logic error in the orinoco_ioctl_set_auth() function in the Linux
kernel's ORiNOCO wireless extensions support implementation could render
TKIP countermeasures ineffective when it is enabled, as it enabled the card
instead of shutting it down. (CVE-2010-4648, Low)

* A missing initialization flaw was found in the ethtool_get_regs()
function in the Linux kernel's ethtool IOCTL handler. A local user who has
the CAP_NET_ADMIN capability could use this flaw to cause an information
leak. (CVE-2010-4655, Low)

* An information leak was found in the Linux kernel's task_show_regs()
implementation. On IBM S/390 systems, a local, unprivileged user could use
this flaw to read /proc/[PID]/status files, allowing them to discover
the CPU register values of processes. (CVE-2011-0710, Low)

Red Hat would like to thank Jens Kuehnel for reporting CVE-2011-0695; Kees
Cook for reporting CVE-2010-4656 and CVE-2010-4655; Dan Rosenberg for
reporting CVE-2010-3296; and Tavis Ormandy for reporting CVE-2010-4346.

This update also fixes several bugs. Documentation for these bug fixes will
be available shortly from the Technical Notes document linked to in the
References section.

Users should upgrade to these updated packages, which contain backported
patches to correct these issues, and fix the bugs noted in the Technical
Notes. The system must be rebooted for this update to take effect.

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

633149 - CVE-2010-3296 kernel: drivers/net/cxgb3/cxgb3_main.c reading uninitialized stack memory
653648 - CVE-2011-0695 kernel: panic in ib_cm:cm_work_handler
662189 - CVE-2010-4346 kernel: install_special_mapping skips security_file_mmap check
664914 - CVE-2010-4526 kernel: sctp: a race between ICMP protocol unreachable and connect()
667907 - CVE-2010-4648 kernel: orinoco: fix TKIP countermeasure behaviour
672398 - CVE-2011-0521 kernel: av7110 negative array offset
672420 - CVE-2010-4656 kernel: iowarrior usb device heap overflow
672428 - CVE-2010-4655 kernel: heap contents leak for CAP_NET_ADMIN via ethtool ioctl
677850 - CVE-2011-0710 kernel: s390 task_show_regs infoleak
678169 - CVE-2011-0716 kernel: deficiency in processing igmp host membership reports in br_multicast
678558 - virtio_console driver never returns from selecting for write when the queue is full [rhel-6.0.z]
678559 - Disallow 0-sized writes to virtio ports to go through to host (leading to VM crash) [rhel-6.0.z]
678562 - writing to a virtio serial port while no one is listening on the host side hangs the guest [rhel-6.0.z]
680080 - Start multi RHEL5.5 64 bit guests triggers rtl8169_interrupt hang [rhel-6.0.z]
683442 - backport set_iounmap_nonlazy() to speedup reading of /proc/vmcore [rhel-6.0.z]
683445 - Backport upstream cacheing fix for optimizing reads from /proc/vmcore [rhel-6.0.z]
683781 - kvm: guest stale memory after migration [rhel-6.0.z]
683783 - guest kernel panic when boot with nmi_watchdog=1 [rhel-6.0.z]
683822 - kernel: restrict unprivileged access to kernel syslog [rhel-6.1] [rhel-6.0.z]
684267 - kernel: missing CONFIG_STRICT_DEVMEM=y in S390x [rhel-6.0.z]
684268 - virtio_net: missing schedule on oom [rhel-6.0.z]
691270 - CVE-2011-1478 kernel: gro: reset dev and skb_iff on skb reuse

https://www.redhat.com/security/data/cve/CVE-2010-3296.html
https://www.redhat.com/security/data/cve/CVE-2010-4346.html
https://www.redhat.com/security/data/cve/CVE-2010-4526.html
https://www.redhat.com/security/data/cve/CVE-2010-4648.html
https://www.redhat.com/security/data/cve/CVE-2010-4655.html
https://www.redhat.com/security/data/cve/CVE-2010-4656.html
https://www.redhat.com/security/data/cve/CVE-2011-0521.html
https://www.redhat.com/security/data/cve/CVE-2011-0695.html
https://www.redhat.com/security/data/cve/CVE-2011-0710.html
https://www.redhat.com/security/data/cve/CVE-2011-0716.html
https://www.redhat.com/security/data/cve/CVE-2011-1478.html
https://access.redhat.com/security/updates/classification/#important
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Technical_Notes/ape.html#RHSA-2011-0421