RHEL 7 : kernel (RHSA-2016:1657)

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 7.1
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) :

* A flaw was found in the Linux kernel's keyring handling code, where
in key_reject_and_link() an uninitialised variable would eventually
lead to arbitrary free address which could allow attacker to use a
use-after-free style attack. (CVE-2016-4470, Important)

* A flaw was found in the way certain interfaces of the Linux kernel's
Infiniband subsystem used write() as bi-directional ioctl()
replacement, which could lead to insufficient memory security checks
when being invoked using the splice() system call. A local
unprivileged user on a system with either Infiniband hardware present
or RDMA Userspace Connection Manager Access module explicitly loaded,
could use this flaw to escalate their privileges on the system.
(CVE-2016-4565, Important)

* A flaw was found in the implementation of the Linux kernel's
handling of networking challenge ack where an attacker is able to
determine the shared counter which could be used to determine sequence
numbers for TCP stream injection. (CVE-2016-5696, Important)

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565 and
Yue Cao (Cyber Security Group of the CS department of University of
California in Riverside) for reporting CVE-2016-5696. The
CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).

See also :

http://rhn.redhat.com/errata/RHSA-2016-1657.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 : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 93094 ()

Bugtraq ID:

CVE ID: CVE-2016-4470
CVE-2016-4565
CVE-2016-5696

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