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Red Hat Security Advisory 2016-1581-01

Red Hat Security Advisory 2016-1581-01
Posted Aug 9, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-1581-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2016-4565
MD5 | 48e9b4a44feac2bce80993045b0ecb3e

Red Hat Security Advisory 2016-1581-01

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

Synopsis: Important: kernel security update
Advisory ID: RHSA-2016:1581-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1581.html
Issue date: 2016-08-09
CVE Names: CVE-2016-4565
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.4
Advanced 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 Server AUS (v. 6.4) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64

3. Description:

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

Security Fix(es):

* A flaw was found in the way certain interfaces of the Linux kernel's
Infiniband subsystem used write() as bi-directional ioctl() replacement,
which could lead to insufficient memory security checks when being invoked
using the splice() system call. A local unprivileged user on a system with
either Infiniband hardware present or RDMA Userspace Connection Manager
Access module explicitly loaded, could use this flaw to escalate their
privileges on the system. (CVE-2016-4565)

Red Hat would like to thank Jann Horn for reporting this issue.

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/):

1310570 - CVE-2016-4565 kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.4):

Source:
kernel-2.6.32-358.72.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-358.72.1.el6.noarch.rpm
kernel-firmware-2.6.32-358.72.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debug-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.72.1.el6.x86_64.rpm
kernel-devel-2.6.32-358.72.1.el6.x86_64.rpm
kernel-headers-2.6.32-358.72.1.el6.x86_64.rpm
perf-2.6.32-358.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.4):

Source:
kernel-2.6.32-358.72.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.72.1.el6.x86_64.rpm
python-perf-2.6.32-358.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.72.1.el6.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-2016-4565
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 2016 Red Hat, Inc.
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