RHSA-2011:0429 - Security Advisory

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:

• 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)

• An inconsistency was found in the interaction between the Linux kernel's

method for allocating NFSv4 (Network File System version 4) ACL data and
the method by which it was freed. This inconsistency led to a kernel panic
which could be triggered by a local, unprivileged user with files owned by
said user on an NFSv4 share. (CVE-2011-1090, 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 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)

• 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)

• A missing validation check was found in the Linux kernel's

mac_partition() implementation, used for supporting file systems created
on Mac OS operating systems. A local attacker could use this flaw to cause
a denial of service by mounting a disk that contains specially-crafted
partitions. (CVE-2011-1010, Low)

Red Hat would like to thank Ryan Sweat for reporting CVE-2011-1478; Tavis
Ormandy for reporting CVE-2010-4346; and Timo Warns for reporting
CVE-2011-1010.

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.

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 - 662189 - CVE-2010-4346 kernel: install_special_mapping skips security_file_mmap check
• BZ - 672398 - CVE-2011-0521 kernel: av7110 negative array offset
• BZ - 675664 - Kernel panic when restart network on vlan with bonding [rhel-5.6.z]
• BZ - 675909 - GFS2: Blocks not marked free on delete [rhel-5.6.z]
• BZ - 677173 - mpctl module doesn't release fasync_struct at file close [rhel-5.6.z]
• BZ - 677850 - CVE-2011-0710 kernel: s390 task_show_regs infoleak
• BZ - 679282 - CVE-2011-1010 kernel: fs/partitions: Validate map_count in Mac partition tables
• BZ - 680043 - [usb-audio] unable to set capture mixer levels [rhel-5.6.z]
• BZ - 680350 - WARNING: APIC timer calibration may be wrong [rhel-5.6.z]
• BZ - 681795 - [NetApp 5.6 Bug] Erroneous TPG ID check in SCSI ALUA Handler [rhel-5.6.z]
• BZ - 682641 - CVE-2011-1090 kernel: nfs4: Ensure that ACL pages sent over NFS were not allocated from the slab
• BZ - 682673 - system fails to boot do to x86-64 kernel corrupting bios memory area [rhel-5.6.z]
• BZ - 683443 - kernel panic in pg_init_done - pgpath already deleted [rhel-5.6.z]
• BZ - 684128 - HP_GETHOSTINFO ioctl always causes mpt controller reset [rhel-5.6.z]
• BZ - 691270 - CVE-2011-1478 kernel: gro: reset dev and skb_iff on skb reuse

CVEs

• CVE-2011-0521
• CVE-2010-4346
• CVE-2011-1478
• CVE-2011-0710
• CVE-2011-1090
• CVE-2011-1010

References

• https://access.redhat.com/security/updates/classification/#important
• http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.6_Technical_Notes/kernel.html#RHSA-2011-0429