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[RHSA-2016:0024-01] Important: kernel security and bug fix update

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=====================================================================

Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2016:0024-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0024.html

Issue date: 2016-01-12

CVE Names: CVE-2015-5307 CVE-2015-8104

=====================================================================

 

1. Summary:

 

Updated kernel packages that fix two security issues and several bugs are

now available for Red Hat Enterprise Linux 6.6 Extended Update Support.

 

Red Hat Product Security 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 Compute Node Optional EUS (v. 6.6) - x86_64

Red Hat Enterprise Linux HPC Node EUS (v. 6.6) - noarch, x86_64

Red Hat Enterprise Linux Server EUS (v. 6.6) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 6.6) - i386, ppc64, s390x, x86_64

 

3. Description:

 

The kernel packages contain the Linux kernel, the core of any Linux

operating system.

 

* It was found that the x86 ISA (Instruction Set Architecture) is prone to

a denial of service attack inside a virtualized environment in the form of

an infinite loop in the microcode due to the way (sequential) delivering of

benign exceptions such as #AC (alignment check exception) and #DB (debug

exception) is handled. A privileged user inside a guest could use these

flaws to create denial of service conditions on the host kernel.

(CVE-2015-5307, CVE-2015-8104, Important)

 

Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the

CVE-2015-5307 issue.

 

This update also fixes the following bugs:

 

* When doing TSO/GSO in the presence of VLAN headers on a macvtap device,

the header offsets were incorrectly calculated. As a consequence, when 2

guests on the same host communicated over a guest configured VLAN,

performance dropped to about 1 Mbps. A set of patches has been provided to

fix this bug, and network performance with VLAN tags now works with optimal

performance. (BZ#1215914)

 

* Prior to this update, TSO acceleration features have been removed from

the VLAN device which caused that VLAN performance on top of a virtio

device was much lower than that of a virtio device itself. This update

re-enables TSO acceleration features, and performance of VLAN devices on

top of a virtio device has thus been restored. (BZ#1240988)

 

* With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor

Advertisement (UNA) was previously sent using the link global IPv6 address

as source address. The underlying source code has been patched, and, after

the failover in bonding, UNA is sent using both the corresponding link IPv6

address and global IPv6 address of bond0 and bond0.vlan. (BZ#1258480)

 

* Previously, Human Interface Device (HID) would run a report on an

unaligned buffer, which could cause a page fault interrupt and an oops when

the end of the report was read. This update fixes this bug by padding the

end of the report with extra bytes, so the reading of the report never

crosses a page boundary. As a result, a page fault and subsequent oops no

longer occur. (BZ#1268202)

 

* Inside hugetlb, region data structures were protected by a combination of

a memory map semaphore and a single hugetlb instance mutex. However, a

page-fault scalability improvement backported to the kernel on previous

releases removed the single hugetlb instance mutex and introduced a new

mutex table, making the locking combination insufficient, leading to

possible race windows that could cause corruption and undefined behavior.

The problem could be seen for example with software mapping or re-mapping

hugetlb areas with concurrent threads reading/writing to same areas causing

page faults. This update fixes the problem by introducing now a required

spinlock to the region tracking functions for proper serialization. The

problem only affects software using huge pages through hugetlb interface.

(BZ#1274597)

 

* Previously, VLAN stacked on the macvlan or macvtap device did not work

for devices that implement and use VLAN filters. As a consequence, macvtap

passthrough mode failed to transfer VLAN packets over the be2net driver.

This update implements VLAN ndo calls to the macvlan driver to pass

appropriate VLAN tag IDs to lower devices. As a result, macvtap transfers

VLAN packets over be2net successfully. (BZ#1280205)

 

All kernel users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues. The system must be

rebooted for this update to take effect.

 

4. 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

 

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

 

1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception

1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception

 

6. Package List:

 

Red Hat Enterprise Linux HPC Node EUS (v. 6.6):

 

Source:

kernel-2.6.32-504.40.1.el6.src.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-504.40.1.el6.noarch.rpm

kernel-doc-2.6.32-504.40.1.el6.noarch.rpm

kernel-firmware-2.6.32-504.40.1.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-504.40.1.el6.x86_64.rpm

kernel-devel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-headers-2.6.32-504.40.1.el6.x86_64.rpm

perf-2.6.32-504.40.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.6):

 

x86_64:

kernel-debug-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-504.40.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server EUS (v. 6.6):

 

Source:

kernel-2.6.32-504.40.1.el6.src.rpm

 

i386:

kernel-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-504.40.1.el6.i686.rpm

kernel-devel-2.6.32-504.40.1.el6.i686.rpm

kernel-headers-2.6.32-504.40.1.el6.i686.rpm

perf-2.6.32-504.40.1.el6.i686.rpm

perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-504.40.1.el6.noarch.rpm

kernel-doc-2.6.32-504.40.1.el6.noarch.rpm

kernel-firmware-2.6.32-504.40.1.el6.noarch.rpm

 

ppc64:

kernel-2.6.32-504.40.1.el6.ppc64.rpm

kernel-bootwrapper-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debug-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-504.40.1.el6.ppc64.rpm

kernel-devel-2.6.32-504.40.1.el6.ppc64.rpm

kernel-headers-2.6.32-504.40.1.el6.ppc64.rpm

perf-2.6.32-504.40.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

 

s390x:

kernel-2.6.32-504.40.1.el6.s390x.rpm

kernel-debug-2.6.32-504.40.1.el6.s390x.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-504.40.1.el6.s390x.rpm

kernel-devel-2.6.32-504.40.1.el6.s390x.rpm

kernel-headers-2.6.32-504.40.1.el6.s390x.rpm

kernel-kdump-2.6.32-504.40.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

kernel-kdump-devel-2.6.32-504.40.1.el6.s390x.rpm

perf-2.6.32-504.40.1.el6.s390x.rpm

perf-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

 

x86_64:

kernel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.i686.rpm

kernel-debug-devel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-504.40.1.el6.x86_64.rpm

kernel-devel-2.6.32-504.40.1.el6.x86_64.rpm

kernel-headers-2.6.32-504.40.1.el6.x86_64.rpm

perf-2.6.32-504.40.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional EUS (v. 6.6):

 

i386:

kernel-debug-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-504.40.1.el6.i686.rpm

perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

python-perf-2.6.32-504.40.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.i686.rpm

 

ppc64:

kernel-debug-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-504.40.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

python-perf-2.6.32-504.40.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.ppc64.rpm

 

s390x:

kernel-debug-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-504.40.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

perf-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

python-perf-2.6.32-504.40.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-504.40.1.el6.s390x.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-504.40.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-2.6.32-504.40.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-504.40.1.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/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2015-5307

https://access.redhat.com/security/cve/CVE-2015-8104

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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