RHEL 6 : kernel (RHSA-2017:2760)

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 is now available for Red Hat Enterprise Linux 6.7
Extended 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.

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

Security Fix(es) :

* It was found that stacking a file system over procfs in the Linux
kernel could lead to a kernel stack overflow due to deep nesting, as
demonstrated by mounting ecryptfs over procfs and creating a recursion
by mapping /proc/ environ. An unprivileged, local user could
potentially use this flaw to escalate their privileges on the system.
(CVE-2016-1583, Important)

Bug Fix(es) :

* Previously, while the MAP_GROWSDOWN flag was set, writing to the
memory which was mapped with the mmap system call failed with the
SIGBUS signal. This update fixes memory management in the Linux kernel
by backporting an upstream patch that enlarges the stack guard page
gap. As a result, mmap now works as expected under the described
circumstances. (BZ#1474721)

See also :

http://rhn.redhat.com/errata/RHSA-2017-2760.html
https://www.redhat.com/security/data/cve/CVE-2016-1583.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 : 6.8
(CVSS2#E:F/RL:ND/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 103350 ()

Bugtraq ID:

CVE ID: CVE-2016-1583

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