====================================================================                   Red Hat Security Advisory

Synopsis:          Important: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2011:1189-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2011:1189.html
Issue date:        2011-08-23
CVE Names:         CVE-2011-1182 CVE-2011-1576 CVE-2011-1593 
                   CVE-2011-1776 CVE-2011-1898 CVE-2011-2183 
                   CVE-2011-2213 CVE-2011-2491 CVE-2011-2492 
                   CVE-2011-2495 CVE-2011-2497 CVE-2011-2517 
                   CVE-2011-2689 CVE-2011-2695 
====================================================================
1. Summary:

Updated kernel packages that fix several security issues, various bugs, and
add two enhancements 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64

3. Description:

Security issues:

* Using PCI passthrough without interrupt remapping support allowed KVM
guests to generate MSI interrupts and thus potentially inject traps. A
privileged guest user could use this flaw to crash the host or possibly
escalate their privileges on the host. The fix for this issue can prevent
PCI passthrough working and guests starting. Refer to Red Hat Bugzilla bug
715555 for details. (CVE-2011-1898, Important)

* Flaw in the client-side NLM implementation could allow a local,
unprivileged user to cause a denial of service. (CVE-2011-2491, Important)

* Integer underflow in the Bluetooth implementation could allow a remote
attacker to cause a denial of service or escalate their privileges by
sending a specially-crafted request to a target system via Bluetooth.
(CVE-2011-2497, Important)

* Buffer overflows in the netlink-based wireless configuration interface
implementation could allow a local user, who has the CAP_NET_ADMIN
capability, to cause a denial of service or escalate their privileges on
systems that have an active wireless interface. (CVE-2011-2517, Important)

* Flaw in the way the maximum file offset was handled for ext4 file systems
could allow a local, unprivileged user to cause a denial of service.
(CVE-2011-2695, Important)

* Flaw allowed napi_reuse_skb() to be called on VLAN packets. An attacker
on the local network could use this flaw to send crafted packets to a
target, possibly causing a denial of service. (CVE-2011-1576, Moderate)

* Integer signedness error in next_pidmap() could allow a local,
unprivileged user to cause a denial of service. (CVE-2011-1593, Moderate)

* Race condition in the memory merging support (KSM) could allow a local,
unprivileged user to cause a denial of service. KSM is off by default, but
on systems running VDSM, or on KVM hosts, it is likely turned on by the
ksm/ksmtuned services. (CVE-2011-2183, Moderate)

* Flaw in inet_diag_bc_audit() could allow a local, unprivileged user to
cause a denial of service. (CVE-2011-2213, Moderate)

* Flaw in the way space was allocated in the Global File System 2 (GFS2)
implementation. If the file system was almost full, and a local,
unprivileged user made an fallocate() request, it could result in a denial
of service. Setting quotas to prevent users from using all available disk
space would prevent exploitation of this flaw. (CVE-2011-2689, Moderate)

* Local, unprivileged users could send signals via the sigqueueinfo system
call, with si_code set to SI_TKILL and with spoofed process and user IDs,
to other processes. This flaw does not allow existing permission checks to
be bypassed; signals can only be sent if your privileges allow you to
already do so. (CVE-2011-1182, Low)

* Heap overflow in the EFI GUID Partition Table (GPT) implementation could
allow a local attacker to cause a denial of service by mounting a disk
containing crafted partition tables. (CVE-2011-1776, Low)

* Structure padding in two structures in the Bluetooth implementation was
not initialized properly before being copied to user-space, possibly
allowing local, unprivileged users to leak kernel stack memory to
user-space. (CVE-2011-2492, Low)

* /proc/[PID]/io is world-readable by default. Previously, these files
could be read without any further restrictions. A local, unprivileged user
could read these files, belonging to other, possibly privileged processes
to gather confidential information, such as the length of a password used
in a process. (CVE-2011-2495, Low)

Red Hat would like to thank Vasily Averin for reporting CVE-2011-2491; Dan
Rosenberg for reporting CVE-2011-2497 and CVE-2011-2213; Ryan Sweat for
reporting CVE-2011-1576; Robert Swiecki for reporting CVE-2011-1593; Andrea
Righi for reporting CVE-2011-2183; Julien Tinnes of the Google Security
Team for reporting CVE-2011-1182; Timo Warns for reporting CVE-2011-1776;
Marek Kroemeke and Filip Palian for reporting CVE-2011-2492; and Vasiliy
Kulikov of Openwall for reporting CVE-2011-2495.

4. Solution:

Refer to the Technical Notes, available shortly from the link in the
References, for bug fix and enhancement details.

Users should upgrade to these updated packages, which contain
backported patches to correct these issues, and fix the bugs and add
the enhancements 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.

5. Bugs fixed (http://bugzilla.redhat.com/):

690028 - CVE-2011-1182 kernel signal spoofing issue
695173 - CVE-2011-1576 kernel: net: Fix memory leak/corruption on VLAN GRO_DROP
697822 - CVE-2011-1593 kernel: proc: signedness issue in next_pidmap()
703019 - CVE-2011-2492 kernel: bluetooth: l2cap and rfcomm: fix 1 byte infoleak to userspace
703026 - CVE-2011-1776 kernel: validate size of EFI GUID partition entries
709393 - CVE-2011-2491 kernel: rpc task leak after flock()ing  NFS share
710338 - CVE-2011-2183 kernel: ksm: race between ksmd and exiting task
713827 - Parallel port issue in RHEL 6.0 server
714536 - CVE-2011-2213 kernel: inet_diag: insufficient validation
714982 - GFS2: Update to rhel6.1 broke dovecot writing to a gfs2 filesystem
715555 - CVE-2011-1898 virt: VT-d (PCI passthrough) MSI trap injection
716539 - bump domain memory limits [6.1.z]
716805 - CVE-2011-2497 kernel: bluetooth: buffer overflow in l2cap config request
716825 - CVE-2011-2495 kernel: /proc/PID/io infoleak
718152 - CVE-2011-2517 kernel: nl80211: missing check for valid SSID size in scan operations
720861 - CVE-2011-2689 kernel: gfs2: make sure fallocate bytes is a multiple of blksize
722557 - CVE-2011-2695 kernel: ext4: kernel panic when writing data to the last block of sparse file

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:

i386:
kernel-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-131.12.1.el6.i686.rpm
kernel-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-headers-2.6.32-131.12.1.el6.i686.rpm
perf-2.6.32-131.12.1.el6.i686.rpm
perf-debuginfo-2.6.32-131.12.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-131.12.1.el6.noarch.rpm
kernel-firmware-2.6.32-131.12.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-131.12.1.el6.x86_64.rpm
kernel-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-headers-2.6.32-131.12.1.el6.x86_64.rpm
perf-2.6.32-131.12.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:

noarch:
kernel-doc-2.6.32-131.12.1.el6.noarch.rpm
kernel-firmware-2.6.32-131.12.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-131.12.1.el6.x86_64.rpm
kernel-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-headers-2.6.32-131.12.1.el6.x86_64.rpm
perf-2.6.32-131.12.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:

i386:
kernel-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-131.12.1.el6.i686.rpm
kernel-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-headers-2.6.32-131.12.1.el6.i686.rpm
perf-2.6.32-131.12.1.el6.i686.rpm
perf-debuginfo-2.6.32-131.12.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-131.12.1.el6.noarch.rpm
kernel-firmware-2.6.32-131.12.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-131.12.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-131.12.1.el6.ppc64.rpm
kernel-debug-2.6.32-131.12.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-131.12.1.el6.ppc64.rpm
kernel-devel-2.6.32-131.12.1.el6.ppc64.rpm
kernel-headers-2.6.32-131.12.1.el6.ppc64.rpm
perf-2.6.32-131.12.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-131.12.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-131.12.1.el6.s390x.rpm
kernel-debug-2.6.32-131.12.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-131.12.1.el6.s390x.rpm
kernel-devel-2.6.32-131.12.1.el6.s390x.rpm
kernel-headers-2.6.32-131.12.1.el6.s390x.rpm
kernel-kdump-2.6.32-131.12.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-131.12.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-131.12.1.el6.s390x.rpm
perf-2.6.32-131.12.1.el6.s390x.rpm
perf-debuginfo-2.6.32-131.12.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-131.12.1.el6.x86_64.rpm
kernel-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-headers-2.6.32-131.12.1.el6.x86_64.rpm
perf-2.6.32-131.12.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:

i386:
kernel-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-131.12.1.el6.i686.rpm
kernel-devel-2.6.32-131.12.1.el6.i686.rpm
kernel-headers-2.6.32-131.12.1.el6.i686.rpm
perf-2.6.32-131.12.1.el6.i686.rpm
perf-debuginfo-2.6.32-131.12.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-131.12.1.el6.noarch.rpm
kernel-firmware-2.6.32-131.12.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-131.12.1.el6.x86_64.rpm
kernel-devel-2.6.32-131.12.1.el6.x86_64.rpm
kernel-headers-2.6.32-131.12.1.el6.x86_64.rpm
perf-2.6.32-131.12.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-131.12.1.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-1182.html
https://www.redhat.com/security/data/cve/CVE-2011-1576.html
https://www.redhat.com/security/data/cve/CVE-2011-1593.html
https://www.redhat.com/security/data/cve/CVE-2011-1776.html
https://www.redhat.com/security/data/cve/CVE-2011-1898.html
https://www.redhat.com/security/data/cve/CVE-2011-2183.html
https://www.redhat.com/security/data/cve/CVE-2011-2213.html
https://www.redhat.com/security/data/cve/CVE-2011-2491.html
https://www.redhat.com/security/data/cve/CVE-2011-2492.html
https://www.redhat.com/security/data/cve/CVE-2011-2495.html
https://www.redhat.com/security/data/cve/CVE-2011-2497.html
https://www.redhat.com/security/data/cve/CVE-2011-2517.html
https://www.redhat.com/security/data/cve/CVE-2011-2689.html
https://www.redhat.com/security/data/cve/CVE-2011-2695.html
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/search/
https://bugzilla.redhat.com/show_bug.cgi?id=715555

8. Contact:

The Red Hat security contact is .  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.