Topic

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 5.

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.

Description

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

This update fixes the following security issues:

• An integer overflow flaw in ib_uverbs_poll_cq() could allow a local,

unprivileged user to cause a denial of service or escalate their
privileges. (CVE-2010-4649, Important)

• A race condition in the way new InfiniBand connections were set up could

allow a remote user to cause a denial of service. (CVE-2011-0695,
Important)

• A flaw in the Stream Control Transmission Protocol (SCTP) implementation

could allow a remote attacker to cause a denial of service if the sysctl
"net.sctp.addip_enable" variable was turned on (it is off by default).
(CVE-2011-1573, Important)

• Flaws in the AGPGART driver implementation when handling certain IOCTL

commands could allow a local, unprivileged user to cause a denial of
service or escalate their privileges. (CVE-2011-1745, CVE-2011-2022,
Important)

• An integer overflow flaw in agp_allocate_memory() could allow a local,

unprivileged user to cause a denial of service or escalate their
privileges. (CVE-2011-1746, Important)

• A flaw allowed napi_reuse_skb() to be called on VLAN (virtual LAN)

packets. An attacker on the local network could trigger this flaw by
sending specially-crafted packets to a target system, possibly causing a
denial of service. (CVE-2011-1576, Moderate)

• An integer signedness error in next_pidmap() could allow a local,

unprivileged user to cause a denial of service. (CVE-2011-1593, Moderate)

• A flaw in the way the Xen hypervisor implementation handled CPUID

instruction emulation during virtual machine exits could allow an
unprivileged guest user to crash a guest. This only affects systems that
have an Intel x86 processor with the Intel VT-x extension enabled.
(CVE-2011-1936, Moderate)

• A flaw in inet_diag_bc_audit() could allow a local, unprivileged user to

cause a denial of service (infinite loop). (CVE-2011-2213, Moderate)

• A missing initialization flaw in the XFS file system implementation

could lead to an information leak. (CVE-2011-0711, Low)

• A flaw in ib_uverbs_poll_cq() could allow a local, unprivileged user to

cause an information leak. (CVE-2011-1044, Low)

• A missing validation check was found in the signals implementation. A

local, unprivileged user could use this flaw to send signals via the
sigqueueinfo system call, with the si_code set to SI_TKILL and with spoofed
process and user IDs, to other processes. Note: 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)

• A heap overflow flaw in the EFI GUID Partition Table (GPT) implementation

could allow a local attacker to cause a denial of service by mounting a
disk containing specially-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)

Red Hat would like to thank Jens Kuehnel for reporting CVE-2011-0695;
Vasiliy Kulikov for reporting CVE-2011-1745, CVE-2011-2022, and
CVE-2011-1746; Ryan Sweat for reporting CVE-2011-1576; Robert Swiecki for
reporting CVE-2011-1593; Dan Rosenberg for reporting CVE-2011-2213 and
CVE-2011-0711; Julien Tinnes of the Google Security Team for reporting
CVE-2011-1182; Timo Warns for reporting CVE-2011-1776; and Marek Kroemeke
and Filip Palian for reporting CVE-2011-2492.

Bug fix documentation will be available shortly from the Technical Notes
document linked to in the References.

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.

Solution

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.

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 i386
• Red Hat Enterprise Linux Server - AUS 5.6 ia64
• Red Hat Enterprise Linux Server - AUS 5.6 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.6 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.6 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 i386
• Red Hat Enterprise Linux Server - AUS 5.6 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x

Fixes

• BZ - 653648 - CVE-2011-0695 kernel: panic in ib_cm:cm_work_handler
• BZ - 667916 - CVE-2010-4649 CVE-2011-1044 kernel: IB/uverbs: Handle large number of entries in poll CQ
• BZ - 677260 - CVE-2011-0711 kernel: xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1
• BZ - 690028 - CVE-2011-1182 kernel signal spoofing issue
• BZ - 695173 - CVE-2011-1576 kernel: net: Fix memory leak/corruption on VLAN GRO_DROP
• BZ - 695383 - CVE-2011-1573 kernel: sctp: fix to calc the INIT/INIT-ACK chunk length correctly to set
• BZ - 697822 - CVE-2011-1593 kernel: proc: signedness issue in next_pidmap()
• BZ - 698996 - CVE-2011-1745 CVE-2011-2022 kernel: agp: insufficient pg_start parameter checking in AGPIOC_BIND and AGPIOC_UNBIND ioctls
• BZ - 698998 - CVE-2011-1746 kernel: agp: insufficient page_count parameter checking in agp_allocate_memory()
• BZ - 703019 - CVE-2011-2492 kernel: bluetooth: l2cap and rfcomm: fix 1 byte infoleak to userspace
• BZ - 703026 - CVE-2011-1776 kernel: validate size of EFI GUID partition entries
• BZ - 703056 - [RHEL5.5] Panic in iscsi_sw_tcp_data_ready() [rhel-5.6.z]
• BZ - 706323 - CVE-2011-1936 kernel: xen: vmx: insecure cpuid vmexit
• BZ - 707899 - The pci resource for vf is not released after hot-removing Intel 82576 NIC [rhel-5.6.z]
• BZ - 711519 - GFS2: resource group bitmap corruption resulting in panics and withdraws
• BZ - 714536 - CVE-2011-2213 kernel: inet_diag: insufficient validation

CVEs

• CVE-2010-4649
• CVE-2011-1044
• CVE-2011-0695
• CVE-2011-0711
• CVE-2011-1573
• CVE-2011-1182
• CVE-2011-1776
• CVE-2011-1746
• CVE-2011-1745
• CVE-2011-1936
• CVE-2011-2492
• CVE-2011-1576
• CVE-2011-2213
• CVE-2011-1593
• CVE-2011-2022

References

• https://access.redhat.com/security/updates/classification/#important
• https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.6_Technical_Notes/kernel.html#RHSA-2011-0927