[RHSA-2017:1297-01] Important: kernel-rt security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: kernel-rt security and bug fix update

Advisory ID: RHSA-2017:1297-01

Product: Red Hat Enterprise MRG for RHEL-6

Advisory URL: https://access.redhat.com/errata/RHSA-2017:1297

Issue date: 2017-05-25

CVE Names: CVE-2016-10208 CVE-2016-7910 CVE-2016-8646

CVE-2017-7308

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1. Summary:

 

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

 

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:

 

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

 

3. Description:

 

The kernel-rt packages provide the Real Time Linux Kernel, which enables

fine-tuning for systems with extremely high determinism requirements.

 

Security Fix(es):

 

* It was found that the packet_set_ring() function of the Linux kernel's

networking implementation did not properly validate certain block-size

data. A local attacker with CAP_NET_RAW capability could use this flaw to

trigger a buffer overflow, resulting in the crash of the system. Due to the

nature of the flaw, privilege escalation cannot be fully ruled out.

(CVE-2017-7308, Important)

 

* Mounting a crafted EXT4 image read-only leads to an attacker controlled

memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)

 

* A flaw was found in the Linux kernel's implementation of seq_file where a

local attacker could manipulate memory in the put() function pointer. This

could lead to memory corruption and possible privileged escalation.

(CVE-2016-7910, Moderate)

 

* A vulnerability was found in the Linux kernel. An unprivileged local user

could trigger oops in shash_async_export() by attempting to force the

in-kernel hashing algorithms into decrypting an empty data set.

(CVE-2016-8646, Moderate)

 

Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for

reporting CVE-2016-8646.

 

Bug Fix(es):

 

* The kernel-rt packages have been upgraded to the 3.10.0-514 source tree,

which provides a number of bug fixes over the previous version.

(BZ#1440807)

 

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/):

 

1388821 - CVE-2016-8646 kernel: Oops in shash_async_export()

1395190 - CVE-2016-10208 kernel: EXT4 memory corruption / SLAB out-of-bounds read

1399727 - CVE-2016-7910 kernel: Use after free in seq file

1437404 - CVE-2017-7308 kernel: net/packet: overflow in check for priv area size

1440807 - update the MRG 2.5.z 3.10 kernel-rt sources

 

6. Package List:

 

MRG Realtime for RHEL 6 Server v.2:

 

Source:

kernel-rt-3.10.0-514.rt56.221.el6rt.src.rpm

 

noarch:

kernel-rt-doc-3.10.0-514.rt56.221.el6rt.noarch.rpm

kernel-rt-firmware-3.10.0-514.rt56.221.el6rt.noarch.rpm

 

x86_64:

kernel-rt-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-debug-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-debug-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-debug-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-trace-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-trace-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-trace-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-vanilla-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm

kernel-rt-vanilla-devel-3.10.0-514.rt56.221.el6rt.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-2016-10208

https://access.redhat.com/security/cve/CVE-2016-7910

https://access.redhat.com/security/cve/CVE-2016-8646

https://access.redhat.com/security/cve/CVE-2017-7308

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2017 Red Hat, Inc.

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