RHSA-2015:1272 - Security Advisory

Topic

Updated kernel packages that fix multiple security issues, address several
hundred bugs, and add numerous enhancements are now available as part of
the ongoing support and maintenance of Red Hat Enterprise Linux version 6.
This is the seventh regular update.

Red Hat Product Security has rated this update as having Moderate 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.

• A flaw was found in the way Linux kernel's Transparent Huge Pages (THP)

implementation handled non-huge page migration. A local, unprivileged user
could use this flaw to crash the kernel by migrating transparent hugepages.
(CVE-2014-3940, Moderate)

• A buffer overflow flaw was found in the way the Linux kernel's eCryptfs

implementation decoded encrypted file names. A local, unprivileged user
could use this flaw to crash the system or, potentially, escalate their
privileges on the system. (CVE-2014-9683, Moderate)

• A race condition flaw was found between the chown and execve system

calls. When changing the owner of a setuid user binary to root, the race
condition could momentarily make the binary setuid root. A local,
unprivileged user could potentially use this flaw to escalate their
privileges on the system. (CVE-2015-3339, Moderate)

• Multiple out-of-bounds write flaws were found in the way the Cherry

Cymotion keyboard driver, KYE/Genius device drivers, Logitech device
drivers, Monterey Genius KB29E keyboard driver, Petalynx Maxter remote
control driver, and Sunplus wireless desktop driver handled HID reports
with an invalid report descriptor size. An attacker with physical access to
the system could use either of these flaws to write data past an allocated
memory buffer. (CVE-2014-3184, Low)

• An information leak flaw was found in the way the Linux kernel's Advanced

Linux Sound Architecture (ALSA) implementation handled access of the user
control's state. A local, privileged user could use this flaw to leak
kernel memory to user space. (CVE-2014-4652, Low)

• It was found that the espfix functionality could be bypassed by

installing a 16-bit RW data segment into GDT instead of LDT (which espfix
checks), and using that segment on the stack. A local, unprivileged user
could potentially use this flaw to leak kernel stack addresses.
(CVE-2014-8133, Low)

• An information leak flaw was found in the Linux kernel's IEEE 802.11

wireless networking implementation. When software encryption was used, a
remote attacker could use this flaw to leak up to 8 bytes of plaintext.
(CVE-2014-8709, Low)

• It was found that the Linux kernel KVM subsystem's sysenter instruction

emulation was not sufficient. An unprivileged guest user could use this
flaw to escalate their privileges by tricking the hypervisor to emulate a
SYSENTER instruction in 16-bit mode, if the guest OS did not initialize the
SYSENTER model-specific registers (MSRs). Note: Certified guest operating
systems for Red Hat Enterprise Linux with KVM do initialize the SYSENTER
MSRs and are thus not vulnerable to this issue when running on a KVM
hypervisor. (CVE-2015-0239, Low)

Red Hat would like to thank Andy Lutomirski for reporting the CVE-2014-8133
issue, and Nadav Amit for reporting the CVE-2015-0239 issue.

This update fixes several hundred bugs and adds numerous enhancements.
Refer to the Red Hat Enterprise Linux 6.7 Release Notes for information on
the most significant of these changes, and the following Knowledgebase
article for further information:

https://access.redhat.com/articles/1466073

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements. 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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 734360 - "opcontrol --deinit" cause kernel panic inside guest os.
• BZ - 840708 - misleading (typo) print for "max_report_luns"
• BZ - 986761 - guest kernel will print many "serial8250: too much work for irq3" when using kvm with isa-serial
• BZ - 1025868 - kernel panic when installing RHEL4 with Opteron G3 CPU model
• BZ - 1066702 - Hugepage allocations hang on numa nodes with insufficient memory
• BZ - 1104097 - CVE-2014-3940 Kernel: missing check during hugepage migration
• BZ - 1113406 - CVE-2014-4652 Kernel: ALSA: control: protect user controls against races & memory disclosure
• BZ - 1115545 - NFS4: remove incorrect "Lock reclaim failed!" warning when delegations are used
• BZ - 1116398 - RHEV-H crashes and reboots when ksmd (MOM) is enabled
• BZ - 1141391 - CVE-2014-3184 Kernel: HID: off by one error in various _report_fixup routines
• BZ - 1144128 - FUSE: Scheduling while atomic OOPSes when using inval_entry
• BZ - 1145751 - kvm_clock lacks protection against tsc going backwards
• BZ - 1150510 - kernel ignores ACPI memory devices (PNP0C80) present at boot time
• BZ - 1156661 - Kernel crash when unmounting Ext4 filesystem
• BZ - 1171317 - xfs may crash after unmount if a log write is delayed
• BZ - 1172797 - CVE-2014-8133 kernel: x86: espfix(64) bypass via set_thread_area and CLONE_SETTLS
• BZ - 1173580 - CVE-2014-8709 kernel: net: mac80211: plain text information leak
• BZ - 1183773 - clock_event_device:min_delta_ns can overflow and can never go down
• BZ - 1186448 - CVE-2015-0239 kernel: kvm: insufficient sysenter emulation when invoked from 16-bit code
• BZ - 1187940 - Regression: Loading memory mapped files does not use the optimal sized (large) I/O any more in kernel 2.6.32-504.3.3.el6.x86_64
• BZ - 1193830 - CVE-2014-9683 kernel: buffer overflow in eCryptfs
• BZ - 1196319 - Backport the dm-switch target to RHEL 6
• BZ - 1200541 - Reset socket ignored when socket state is LAST-ACK and connection state is SYN-SENT
• BZ - 1208065 - O_TRUNC ignored on NFS file with invalid cache entry
• BZ - 1214030 - CVE-2015-3339 kernel: race condition between chown() and execve()

CVEs

• CVE-2014-3940
• CVE-2014-4652
• CVE-2014-3184
• CVE-2014-8709
• CVE-2014-9683
• CVE-2014-8133
• CVE-2015-0239
• CVE-2015-3339

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/articles/1466073