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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2017:1766-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1766
Issue date:        2017-07-18
CVE Names:         CVE-2017-7895 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.2
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, x86_64

3. Description:

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

Security Fix(es):

* The NFSv2 and NFSv3 server implementations in the Linux kernel through
4.10.13 lacked certain checks for the end of a buffer. A remote attacker
could trigger a pointer-arithmetic error or possibly cause other
unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and
fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

Red Hat would like to thank Ari Kauppi for reporting this issue.

Bug Fix(es):

* Previously, a race condition between Linux kernel module error handling
and kprobe registration code existed in the Linux kernel. The protection
that was applied during module error handling code could be overridden by
kprobe registration code before the module was deallocated. Consequently,
the mapped page could be freed and become not 'writable'. When this page
was later accessed, a page fault occurred, which led to a kernel panic.
This update fixes the race condition, and the kernel no longer panics due
to this bug. (BZ#1454683)

* Due to a race with another NFS mount, the nfs41_walk_client_list()
function previously established a lease on the nfs_client pointer before
the check for trunking was finished. This update ensures the processes
follow the correct order and the race no longer occurs in this scenario.
(BZ#1447383)

* If a duplicate IPv6 address or an issue setting an address was present in
the net/ipv6/addrconf.c file, a race condition occurred that could cause an
IFP refcount leak. Attempts to unregister a netdevice then produced
"Unregister Netdevice Failed" error messages. The provided patch fixes this
bug, and race conditions no longer occur in this situation. (BZ#1449103)

* Previously, subtracting from vCPU threads could cause a steal_time
overflow on QEMU live migration. This update makes sure steal_time
accumulation to vCPU entry time is moved before copying steal_time data to
QEMU guest, thus fixing this bug. (BZ#1274919)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

The system must be rebooted for this update to take effect.

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

1446103 - CVE-2017-7895 kernel: NFSv3 server does not properly handle payload bounds checking of WRITE requests

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2):

Source:
kernel-3.10.0-327.58.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.58.1.el7.noarch.rpm
kernel-doc-3.10.0-327.58.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.58.1.el7.x86_64.rpm
perf-3.10.0-327.58.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.58.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
kernel-3.10.0-327.58.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.58.1.el7.noarch.rpm
kernel-doc-3.10.0-327.58.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-327.58.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debug-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.58.1.el7.ppc64.rpm
kernel-devel-3.10.0-327.58.1.el7.ppc64.rpm
kernel-headers-3.10.0-327.58.1.el7.ppc64.rpm
kernel-tools-3.10.0-327.58.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-327.58.1.el7.ppc64.rpm
perf-3.10.0-327.58.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
python-perf-3.10.0-327.58.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debug-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-devel-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-headers-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-tools-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.58.1.el7.ppc64le.rpm
perf-3.10.0-327.58.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
python-perf-3.10.0-327.58.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-327.58.1.el7.s390x.rpm
kernel-debug-3.10.0-327.58.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-327.58.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-327.58.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-327.58.1.el7.s390x.rpm
kernel-devel-3.10.0-327.58.1.el7.s390x.rpm
kernel-headers-3.10.0-327.58.1.el7.s390x.rpm
kernel-kdump-3.10.0-327.58.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-327.58.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-327.58.1.el7.s390x.rpm
perf-3.10.0-327.58.1.el7.s390x.rpm
perf-debuginfo-3.10.0-327.58.1.el7.s390x.rpm
python-perf-3.10.0-327.58.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.s390x.rpm

x86_64:
kernel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.58.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.58.1.el7.x86_64.rpm
perf-3.10.0-327.58.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.2):

ppc64:
kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.58.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-327.58.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.58.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.58.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.58.1.el7.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-2017-7895
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/

Copyright 2017 Red Hat, Inc.
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