Important CentOS kernel Security Update

Metadata

high
unknown
kernel-3.10.0-327.el7.x86_64.rpm, kernel-abi-whitelists-3.10.0-327.el7.noarch.rpm, kernel-debug-3.10.0-327.el7.x86_64.rpm, kernel-debug-devel-3.10.0-327.el7.x86_64.rpm, kernel-devel-3.10.0-327.el7.x86_64.rpm, kernel-doc-3.10.0-327.el7.noarch.rpm, kernel-headers-3.10.0-327.el7.x86_64.rpm, kernel-tools-3.10.0-327.el7.x86_64.rpm, kernel-tools-libs-3.10.0-327.el7.x86_64.rpm, kernel-tools-libs-devel-3.10.0-327.el7.x86_64.rpm, perf-3.10.0-327.el7.x86_64.rpm, python-perf-3.10.0-327.el7.x86_64.rpm
rhn.redhat.com, lists.centos.org
2015-11-30
2018-01-18 11:11
2017-07-27 19:10
2017-04-01 19:09
2017-01-05 20:13

Description


Updated kernel packages that fix multiple security issues, address several
hundred bugs, and add numerous enhancements are now available as part of
the ongoing support and maintenance of Red Hat Enterprise Linux version 7.
This is the second regular update.

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.

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

* A flaw was found in the way the Linux kernel's file system implementation
handled rename operations in which the source was inside and the
destination was outside of a bind mount. A privileged user inside a
container could use this flaw to escape the bind mount and, potentially,
escalate their privileges on the system. (CVE-2015-2925, Important)

* A race condition flaw was found in the way the Linux kernel's IPC
subsystem initialized certain fields in an IPC object structure that were
later used for permission checking before inserting the object into a
globally visible list. A local, unprivileged user could potentially use
this flaw to elevate their privileges on the system. (CVE-2015-7613,
Important)

* It was found that reporting emulation failures to user space could lead
to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of
service. In the case of a local denial of service, an attacker must have
access to the MMIO area or be able to access an I/O port. (CVE-2010-5313,
CVE-2014-7842, Moderate)

* A flaw was found in the way the Linux kernel's KVM subsystem handled
non-canonical addresses when emulating instructions that change the RIP
(for example, branches or calls). A guest user with access to an I/O or
MMIO region could use this flaw to crash the guest. (CVE-2014-3647,
Moderate)

* It was found that the Linux kernel memory resource controller's (memcg)
handling of OOM (out of memory) conditions could lead to deadlocks.
An attacker could use this flaw to lock up the system. (CVE-2014-8171,
Moderate)

* A race condition flaw was found between the chown and execve system
calls. A local, unprivileged user could potentially use this flaw to
escalate their privileges on the system. (CVE-2015-3339, Moderate)

* A flaw was discovered in the way the Linux kernel's TTY subsystem handled
the tty shutdown phase. A local, unprivileged user could use this flaw to
cause a denial of service on the system. (CVE-2015-4170, Moderate)

* A NULL pointer dereference flaw was found in the SCTP implementation.
A local user could use this flaw to cause a denial of service on the system
by triggering a kernel panic when creating multiple sockets in parallel
while the system did not have the SCTP module loaded. (CVE-2015-5283,
Moderate)

* A flaw was found in the way the Linux kernel's perf subsystem retrieved
userlevel stack traces on PowerPC systems. A local, unprivileged user could
use this flaw to cause a denial of service on the system. (CVE-2015-6526,
Moderate)

* A flaw was found in the way the Linux kernel's Crypto subsystem handled
automatic loading of kernel modules. A local user could use this flaw to
load any installed kernel module, and thus increase the attack surface of
the running kernel. (CVE-2013-7421, CVE-2014-9644, Low)

* An information leak flaw was found in the way the Linux kernel changed
certain segment registers and thread-local storage (TLS) during a context
switch. A local, unprivileged user could use this flaw to leak the user
space TLS base address of an arbitrary process. (CVE-2014-9419, Low)

* It was found that the Linux kernel KVM subsystem's sysenter instruction
emulation was not sufficient. An unprivileged guest user could use this
flaw to escalate their privileges by tricking the hypervisor to emulate a
SYSENTER instruction in 16-bit mode, if the guest OS did not initialize the
SYSENTER model-specific registers (MSRs). Note: Certified guest operating
systems for Red Hat Enterprise Linux with KVM do initialize the SYSENTER
MSRs and are thus not vulnerable to this issue when running on a KVM
hypervisor. (CVE-2015-0239, Low)

* A flaw was found in the way the Linux kernel handled the securelevel
functionality after performing a kexec operation. A local attacker could
use this flaw to bypass the security mechanism of the
securelevel/secureboot combination. (CVE-2015-7837, Low)
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Affected package information

Release Package Patched in
7 kernel kernel-3.10.0-327.el7.x86_64.rpm
kernel-abi-whitelists kernel-abi-whitelists-3.10.0-327.el7.noarch.rpm
kernel-debug kernel-debug-3.10.0-327.el7.x86_64.rpm
kernel-debug-devel kernel-debug-devel-3.10.0-327.el7.x86_64.rpm
kernel-devel kernel-devel-3.10.0-327.el7.x86_64.rpm
kernel-doc kernel-doc-3.10.0-327.el7.noarch.rpm
kernel-headers kernel-headers-3.10.0-327.el7.x86_64.rpm
kernel-tools kernel-tools-3.10.0-327.el7.x86_64.rpm
kernel-tools-libs kernel-tools-libs-3.10.0-327.el7.x86_64.rpm
kernel-tools-libs-devel kernel-tools-libs-devel-3.10.0-327.el7.x86_64.rpm
perf perf-3.10.0-327.el7.x86_64.rpm
python-perf python-perf-3.10.0-327.el7.x86_64.rpm