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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:2390-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2390
Issue date: 2018-08-14
CVE Names: CVE-2017-0861 CVE-2017-15265 CVE-2018-3620
CVE-2018-3646 CVE-2018-3693 CVE-2018-7566
CVE-2018-10901 CVE-2018-1000004
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.

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 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(es):

* Modern operating systems implement virtualization of physical memory to
efficiently use available system resources and provide inter-domain
protection through access control and isolation. The L1TF issue was found
in the way the x86 microprocessor designs have implemented speculative
execution of instructions (a commonly used performance optimisation) in
combination with handling of page-faults caused by terminated virtual to
physical address resolving process. As a result, an unprivileged attacker
could use this flaw to read privileged memory of the kernel or other
processes and/or cross guest/host boundaries to read host memory by
conducting targeted cache side-channel attacks. (CVE-2018-3620,
CVE-2018-3646)

* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions past bounds
check. The flaw relies on the presence of a precisely-defined instruction
sequence in the privileged code and the fact that memory writes occur to an
address which depends on the untrusted value. Such writes cause an update
into the microprocessor’s data cache even for speculatively executed
instructions that never actually commit (retire). As a result, an
unprivileged attacker could use this flaw to influence speculative
execution and/or read privileged memory by conducting targeted cache
side-channel attacks. (CVE-2018-3693)

* kernel: kvm: vmx: host GDT limit corruption (CVE-2018-10901)

* kernel: Use-after-free in snd_pcm_info function in ALSA subsystem
potentially leads to privilege escalation (CVE-2017-0861)

* kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265)

* kernel: race condition in snd_seq_write() may lead to UAF or OOB-access
(CVE-2018-7566)

* kernel: Race condition in sound system can lead to denial of service
(CVE-2018-1000004)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting
CVE-2018-3620 and CVE-2018-3646; Vladimir Kiriansky (MIT) and Carl
Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693; and
Vegard Nossum (Oracle Corporation) for reporting CVE-2018-10901.

Bug Fix(es):

* The Least recently used (LRU) operations are batched by caching pages in
per-cpu page vectors to prevent contention of the heavily used lru_lock
spinlock. The page vectors can hold even the compound pages. Previously,
the page vectors were cleared only if they were full. Subsequently, the
amount of memory held in page vectors, which is not reclaimable, was
sometimes too high. Consequently the page reclamation started the Out of
Memory (OOM) killing processes. With this update, the underlying source
code has been fixed to clear LRU page vectors each time when a compound
page is added to them. As a result, OOM killing processes due to high
amounts of memory held in page vectors no longer occur. (BZ#1575819)

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/):

1501878 – CVE-2017-15265 kernel: Use-after-free in snd_seq_ioctl_create_port()
1535315 – CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service
1550142 – CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access
1563994 – CVE-2017-0861 kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation
1581650 – CVE-2018-3693 Kernel: speculative bounds check bypass store
1585005 – CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF)
1601849 – CVE-2018-10901 kernel: kvm: vmx: host GDT limit corruption

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-754.3.5.el6.src.rpm

i386:
kernel-2.6.32-754.3.5.el6.i686.rpm
kernel-debug-2.6.32-754.3.5.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm
kernel-devel-2.6.32-754.3.5.el6.i686.rpm
kernel-headers-2.6.32-754.3.5.el6.i686.rpm
perf-2.6.32-754.3.5.el6.i686.rpm
perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm
kernel-doc-2.6.32-754.3.5.el6.noarch.rpm
kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm

x86_64:
kernel-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debug-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm
kernel-debug-devel-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm
kernel-devel-2.6.32-754.3.5.el6.x86_64.rpm
kernel-headers-2.6.32-754.3.5.el6.x86_64.rpm
perf-2.6.32-754.3.5.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm
perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm

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

i386:
kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm
perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm
python-perf-2.6.32-754.3.5.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm
python-perf-2.6.32-754.3.5.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm

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

Source:
kernel-2.6.32-754.3.5.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm
kernel-doc-2.6.32-754.3.5.el6.noarch.rpm
kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm

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

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-754.3.5.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm
kernel-doc-2.6.32-754.3.5.el6.noarch.rpm
kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm

ppc64:
kernel-2.6.32-754.3.5.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debug-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debug-devel-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-754.3.5.el6.ppc64.rpm
kernel-devel-2.6.32-754.3.5.el6.ppc64.rpm
kernel-headers-2.6.32-754.3.5.el6.ppc64.rpm
perf-2.6.32-754.3.5.el6.ppc64.rpm
perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm

s390x:
kernel-2.6.32-754.3.5.el6.s390x.rpm
kernel-debug-2.6.32-754.3.5.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
kernel-debug-devel-2.6.32-754.3.5.el6.s390x.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-754.3.5.el6.s390x.rpm
kernel-devel-2.6.32-754.3.5.el6.s390x.rpm
kernel-headers-2.6.32-754.3.5.el6.s390x.rpm
kernel-kdump-2.6.32-754.3.5.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
kernel-kdump-devel-2.6.32-754.3.5.el6.s390x.rpm
perf-2.6.32-754.3.5.el6.s390x.rpm
perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm

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

ppc64:
kernel-debug-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-754.3.5.el6.ppc64.rpm
perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm
python-perf-2.6.32-754.3.5.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
kernel-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-754.3.5.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm
python-perf-2.6.32-754.3.5.el6.s390x.rpm
python-perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-754.3.5.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm
kernel-doc-2.6.32-754.3.5.el6.noarch.rpm
kernel-firmware-2.6.32-754.3.5.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-2017-0861
https://access.redhat.com/security/cve/CVE-2017-15265
https://access.redhat.com/security/cve/CVE-2018-3620
https://access.redhat.com/security/cve/CVE-2018-3646
https://access.redhat.com/security/cve/CVE-2018-3693
https://access.redhat.com/security/cve/CVE-2018-7566
https://access.redhat.com/security/cve/CVE-2018-10901
https://access.redhat.com/security/cve/CVE-2018-1000004
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/L1TF

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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