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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2016:1406-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1406
Issue date: 2016-07-12
CVE Names: CVE-2016-4565
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 6.

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

3. Description:

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

Security Fix:

* A flaw was found in the way certain interfaces of the Linux kernel’s
Infiniband subsystem used write() as bi-directional ioctl() replacement,
which could lead to insufficient memory security checks when being invoked
using the the splice() system call. A local unprivileged user on a system
with either Infiniband hardware present or RDMA Userspace Connection
Manager Access module explicitly loaded, could use this flaw to escalate
their privileges on the system. (CVE-2016-4565, Important)

Red Hat would like to thank Jann Horn for reporting this issue.

This update also fixes the following bugs:

* When providing some services and using the Integrated Services Digital
Network (ISDN), the system could terminate unexpectedly due to the call of
the tty_ldisc_flush() function. The provided patch removes this call and
the system no longer hangs in the described scenario. (BZ#1337443)

* An update to the Red Hat Enterprise Linux 6.8 kernel added calls of two
functions provided by the ipv6.ko kernel module, which added a dependency
on that module. On systems where ipv6.ko was prevented from being loaded,
the nfsd.ko and lockd.ko modules were unable to be loaded. Consequently, it
was not possible to run an NFS server or to mount NFS file systems as a
client. The underlying source code has been fixed by adding the
symbol_get() function, which determines if nfsd.ko and lock.ko are loaded
into memory and calls them through function pointers, not directly. As a
result, the aforementioned kernel modules are allowed to be loaded even if
ipv6.ko is not, and the NFS mount works as expected. (BZ#1341496)

* After upgrading the kernel, CPU load average increased compared to the
prior kernel version due to the modification of the scheduler. The provided
patch set reverts the calculation algorithm of this load average to the the
previous version thus resulting in relatively lower values under the same
system load. (BZ#1343015)

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/):

1310570 – CVE-2016-4565 kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-642.3.1.el6.src.rpm

i386:
kernel-2.6.32-642.3.1.el6.i686.rpm
kernel-debug-2.6.32-642.3.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debug-devel-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-642.3.1.el6.i686.rpm
kernel-devel-2.6.32-642.3.1.el6.i686.rpm
kernel-headers-2.6.32-642.3.1.el6.i686.rpm
perf-2.6.32-642.3.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.3.1.el6.noarch.rpm
kernel-doc-2.6.32-642.3.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.3.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debug-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-642.3.1.el6.i686.rpm
kernel-debug-devel-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-642.3.1.el6.x86_64.rpm
kernel-devel-2.6.32-642.3.1.el6.x86_64.rpm
kernel-headers-2.6.32-642.3.1.el6.x86_64.rpm
perf-2.6.32-642.3.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-642.3.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm
python-perf-2.6.32-642.3.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-642.3.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm
python-perf-2.6.32-642.3.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-642.3.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.3.1.el6.noarch.rpm
kernel-doc-2.6.32-642.3.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.3.1.el6.noarch.rpm

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

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-642.3.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.3.1.el6.noarch.rpm
kernel-doc-2.6.32-642.3.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.3.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-642.3.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debug-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-642.3.1.el6.ppc64.rpm
kernel-devel-2.6.32-642.3.1.el6.ppc64.rpm
kernel-headers-2.6.32-642.3.1.el6.ppc64.rpm
perf-2.6.32-642.3.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-642.3.1.el6.s390x.rpm
kernel-debug-2.6.32-642.3.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-642.3.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-642.3.1.el6.s390x.rpm
kernel-devel-2.6.32-642.3.1.el6.s390x.rpm
kernel-headers-2.6.32-642.3.1.el6.s390x.rpm
kernel-kdump-2.6.32-642.3.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-642.3.1.el6.s390x.rpm
perf-2.6.32-642.3.1.el6.s390x.rpm
perf-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

ppc64:
kernel-debug-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-642.3.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm
python-perf-2.6.32-642.3.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-642.3.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
perf-debuginfo-2.6.32-642.3.1.el6.s390x.rpm
python-perf-2.6.32-642.3.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-642.3.1.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-642.3.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.3.1.el6.noarch.rpm
kernel-doc-2.6.32-642.3.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.3.1.el6.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

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-2016-4565
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

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