RHEL 6 : kernel-rt (RHSA-2016:2107) (Dirty COW)

This script is Copyright (C) 2016-2017 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
2.5.

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) :

* A race condition was found in the way the Linux kernel's memory
subsystem handled the copy-on-write (COW) breakage of private
read-only memory mappings. An unprivileged, local user could use this
flaw to gain write access to otherwise read-only memory mappings and
thus increase their privileges on the system. (CVE-2016-5195,
Important)

* Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q)
OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with
Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a
stack overflow issue. It could occur while receiving large packets via
GRO path; As an unlimited recursion could unfold in both VLAN and TEB
modules, leading to a stack corruption in the kernel. (CVE-2016-7039,
Important)

Red Hat would like to thank Phil Oester for reporting CVE-2016-5195.

See also :

https://www.redhat.com/security/data/cve/CVE-2016-5195.html
https://www.redhat.com/security/data/cve/CVE-2016-7039.html
https://access.redhat.com/security/vulnerabilities/2706661
http://rhn.redhat.com/errata/RHSA-2016-2107.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.8
(CVSS2#E:POC/RL:OF/RC:UR)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 94315 ()

Bugtraq ID:

CVE ID: CVE-2016-5195
CVE-2016-7039

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