RHEL 6 : kernel-rt (RHSA-2017:1297)

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


Synopsis :

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

Description :

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.

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)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-10208.html
https://www.redhat.com/security/data/cve/CVE-2016-7910.html
https://www.redhat.com/security/data/cve/CVE-2016-8646.html
https://www.redhat.com/security/data/cve/CVE-2017-7308.html
http://rhn.redhat.com/errata/RHSA-2017-1297.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.3
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 100455 ()

Bugtraq ID:

CVE ID: CVE-2016-10208
CVE-2016-7910
CVE-2016-8646
CVE-2017-7308

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