RHEL 7 : kernel (RHSA-2015:0290)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

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 first 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 XFS file system
handled replacing of remote attributes under certain conditions. A
local user with access to XFS file system mount could potentially use
this flaw to escalate their privileges on the system. (CVE-2015-0274,
Important)

* It was found that the Linux kernel's KVM implementation did not
ensure that the host CR4 control register value remained unchanged
across VM entries on the same virtual CPU. A local, unprivileged user
could use this flaw to cause denial of service on the system.
(CVE-2014-3690, Moderate)

* A flaw was found in the way Linux kernel's Transparent Huge Pages
(THP) implementation handled non-huge page migration. A local,
unprivileged user could use this flaw to crash the kernel by migrating
transparent hugepages. (CVE-2014-3940, Moderate)

* An out-of-bounds memory access flaw was found in the syscall tracing
functionality of the Linux kernel's perf subsystem. A local,
unprivileged user could use this flaw to crash the system.
(CVE-2014-7825, Moderate)

* An out-of-bounds memory access flaw was found in the syscall tracing
functionality of the Linux kernel's ftrace subsystem. On a system with
ftrace syscall tracing enabled, a local, unprivileged user could use
this flaw to crash the system, or escalate their privileges.
(CVE-2014-7826, Moderate)

* A race condition flaw was found in the Linux kernel's ext4 file
system implementation that allowed a local, unprivileged user to crash
the system by simultaneously writing to a file and toggling the
O_DIRECT flag using fcntl(F_SETFL) on that file. (CVE-2014-8086,
Moderate)

* A flaw was found in the way the Linux kernel's netfilter subsystem
handled generic protocol tracking. As demonstrated in the Stream
Control Transmission Protocol (SCTP) case, a remote attacker could use
this flaw to bypass intended iptables rule restrictions when the
associated connection tracking module was not loaded on the system.
(CVE-2014-8160, Moderate)

* It was found that due to excessive files_lock locking, a soft lockup
could be triggered in the Linux kernel when performing asynchronous
I/O operations. A local, unprivileged user could use this flaw to
crash the system. (CVE-2014-8172, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux
kernel's madvise MADV_WILLNEED functionality handled page table
locking. A local, unprivileged user could use this flaw to crash the
system. (CVE-2014-8173, Moderate)

* An information leak flaw was found in the Linux kernel's IEEE 802.11
wireless networking implementation. When software encryption was used,
a remote attacker could use this flaw to leak up to 8 bytes of
plaintext. (CVE-2014-8709, Low)

* A stack-based buffer overflow flaw was found in the
TechnoTrend/Hauppauge DEC USB device driver. A local user with write
access to the corresponding device could use this flaw to crash the
kernel or, potentially, elevate their privileges on the system.
(CVE-2014-8884, Low)

Red Hat would like to thank Eric Windisch of the Docker project for
reporting CVE-2015-0274, Andy Lutomirski for reporting CVE-2014-3690,
and Robert Swiecki for reporting CVE-2014-7825 and CVE-2014-7826.

This update also fixes several hundred bugs and adds numerous
enhancements. Refer to the Red Hat Enterprise Linux 7.1 Release Notes
for information on the most significant of these changes, and the
following Knowledgebase article for further information:
https://access.redhat.com/articles/1352803

All Red Hat Enterprise Linux 7 users are advised to install these
updated packages, which correct these issues and add these
enhancements. The system must be rebooted for this update to take
effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-3690.html
https://www.redhat.com/security/data/cve/CVE-2014-3940.html
https://www.redhat.com/security/data/cve/CVE-2014-7825.html
https://www.redhat.com/security/data/cve/CVE-2014-7826.html
https://www.redhat.com/security/data/cve/CVE-2014-8086.html
https://www.redhat.com/security/data/cve/CVE-2014-8160.html
https://www.redhat.com/security/data/cve/CVE-2014-8172.html
https://www.redhat.com/security/data/cve/CVE-2014-8173.html
https://www.redhat.com/security/data/cve/CVE-2014-8709.html
https://www.redhat.com/security/data/cve/CVE-2014-8884.html
https://www.redhat.com/security/data/cve/CVE-2015-0274.html
https://access.redhat.com/articles/1352803
http://rhn.redhat.com/errata/RHSA-2015-0290.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

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