RHEL 6 : kernel (RHSA-2016:1815)

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 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 the RFC 5961 challenge ACK rate limiting as
implemented in the Linux kernel's networking subsystem allowed an
off-path attacker to leak certain information about a given connection
by creating congestion on the global challenge ACK rate limit counter
and then measuring the changes by probing packets. An off-path
attacker could use this flaw to either terminate TCP connection and/or
inject payload into non-secured TCP connection between two endpoints
on the network. (CVE-2016-5696, Important)

Red Hat would like to thank Yue Cao (Cyber Security Group of the CS
department of University of California in Riverside) for reporting
this issue.

Bug Fix(es) :

* When an interrupt request occurred and the new API was scheduled on
a different CPU, the enic driver previously generated a warning
message. This behavior was caused by a race condition between the
vnic_intr_unmask() function and the enic_poll_unlock_napi() function.
This update fixes the napi_poll() function to unlock before unmasking
the interrupt. As a result, the warning message no longer occurs in
the described situation. (BZ#1351192)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-5696.html
http://rhn.redhat.com/errata/RHSA-2016-1815.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.8
(CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P)
CVSS Temporal Score : 4.8
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 93365 ()

Bugtraq ID:

CVE ID: CVE-2016-5696

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