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Red Hat Security Advisory 2017-2437-01

Red Hat Security Advisory 2017-2437-01
Posted Aug 8, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2437-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: A use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system. A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2015-8970, CVE-2016-10200, CVE-2017-2647, CVE-2017-8797
MD5 | 0684f5486bf12c5610fea042bfa7176e

Red Hat Security Advisory 2017-2437-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2017:2437-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2437
Issue date: 2017-08-08
CVE Names: CVE-2015-8970 CVE-2016-10200 CVE-2017-2647
CVE-2017-8797
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.3
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. 7.3) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.3) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.3) - ppc64, ppc64le, x86_64

3. Description:

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

Security Fix(es):

* A use-after-free flaw was found in the Linux kernel which enables a race
condition in the L2TPv3 IP Encapsulation feature. A local user could use
this flaw to escalate their privileges or crash the system.
(CVE-2016-10200, Important)

* A flaw was found that can be triggered in keyring_search_iterator in
keyring.c if type->match is NULL. A local user could use this flaw to crash
the system or, potentially, escalate their privileges. (CVE-2017-2647,
Important)

* It was found that the NFSv4 server in the Linux kernel did not properly
validate layout type when processing NFSv4 pNFS LAYOUTGET and GETDEVICEINFO
operands. A remote attacker could use this flaw to soft-lockup the system
and thus cause denial of service. (CVE-2017-8797, Important)

* The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5
allows local users to cause a system crash and a denial of service by the
NULL pointer dereference via accept(2) system call for AF_ALG socket
without calling setkey() first to set a cipher key. (CVE-2015-8970,
Moderate)

Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin
(Virtuozzo) for reporting CVE-2017-2647 and Igor Redko (Virtuozzo) and
Vasily Averin (Virtuozzo) for reporting CVE-2015-8970.

Bug Fix(es):

* When running the LPAR with IBM Power 8 SMT8 mode, system performance
degradation occurred due to the load getting spread across threads from the
same core. The provided patches fix scheduler performance issues and assure
the load is spread across cores, thus improving the system performance
significantly. (BZ#1434853)

* Upon reboot, the bond slave with some network adapter ports became
unresponsive in the backup state and never proceeded to the active state.
As a consequence, the bond slave never transmitted any LACP PDU and the
bond interface was never produced properly. With this update, the i40e
network driver has been fixed for long link-down notification time and the
bond slave now transmits LACP PDUs as expected. (BZ#1446783)

* When attempting to configure two or more Ethernet adapter cards using
Virtual Function I/O (VFIO) in the KVM guest, subsequent KVM guests
previously failed to boot returning an error message. The provided patch
adds the ability of VFIO to support more than one card in the KVM guest
environment. (BZ#1447718)

* It is possible to define the CPUs in which unbound kworkers can run by
setting a "mask" in a specific file in the sysfs file system, helping on
CPU isolation. However, this setup did not work properly, and unbounded
kworkers were being activated on CPUs in which they were set to _NOT_ run.
The provided patchset prevents unbound kworkers from being run on CPUs that
are masked, thus fixing this bug. (BZ#1458203)

* Due to a regression, the kernel previously failed to create the
/sys/block/<sd device>/devices/enclosure_device symlinks. The provided
patch corrects the call to the scsi_is_sas_rphy() function, which is now
made on the SAS end device, instead of the SCSI device. (BZ#1460204)

* Previously, the system panic occurred when running mkfs.ext4 on newly
created software RAID1 partitions on SATA SDD drives. The provided patch
ensures the ext4 file system is created on the /dev/md0 partition and is
mounted there successfully. (BZ#1463359)

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/):

1330056 - Kernel: ppc64 sbrk returns executable heap in 32-bit emulation mode
1386286 - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
1428353 - CVE-2017-2647 kernel: Null pointer dereference in search_keyring
1430347 - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature
1466329 - CVE-2017-8797 kernel: NFSv4 server does not properly validate layout type when processing NFSv4 pNFS LAYOUTGET operand

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.3):

Source:
kernel-3.10.0-514.28.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.28.1.el7.noarch.rpm
kernel-doc-3.10.0-514.28.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.28.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.28.1.el7.x86_64.rpm
perf-3.10.0-514.28.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3):

x86_64:
kernel-debug-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.28.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.3):

Source:
kernel-3.10.0-514.28.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.28.1.el7.noarch.rpm
kernel-doc-3.10.0-514.28.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-514.28.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debug-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.28.1.el7.ppc64.rpm
kernel-devel-3.10.0-514.28.1.el7.ppc64.rpm
kernel-headers-3.10.0-514.28.1.el7.ppc64.rpm
kernel-tools-3.10.0-514.28.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-514.28.1.el7.ppc64.rpm
perf-3.10.0-514.28.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
python-perf-3.10.0-514.28.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debug-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-devel-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-headers-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-tools-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-514.28.1.el7.ppc64le.rpm
perf-3.10.0-514.28.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
python-perf-3.10.0-514.28.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-514.28.1.el7.s390x.rpm
kernel-debug-3.10.0-514.28.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-514.28.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-514.28.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-514.28.1.el7.s390x.rpm
kernel-devel-3.10.0-514.28.1.el7.s390x.rpm
kernel-headers-3.10.0-514.28.1.el7.s390x.rpm
kernel-kdump-3.10.0-514.28.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-514.28.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-514.28.1.el7.s390x.rpm
perf-3.10.0-514.28.1.el7.s390x.rpm
perf-debuginfo-3.10.0-514.28.1.el7.s390x.rpm
python-perf-3.10.0-514.28.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.s390x.rpm

x86_64:
kernel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.28.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.28.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.28.1.el7.x86_64.rpm
perf-3.10.0-514.28.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.3):

ppc64:
kernel-debug-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.28.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-514.28.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-514.28.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.28.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.28.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.28.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.28.1.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-2015-8970
https://access.redhat.com/security/cve/CVE-2016-10200
https://access.redhat.com/security/cve/CVE-2017-2647
https://access.redhat.com/security/cve/CVE-2017-8797
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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