RHEL 6 : kernel (RHSA-2016:1096)

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 6.4
Advanced 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) :

* Two flaws were found in the way the Linux kernel's networking
implementation handled UDP packets with incorrect checksum values. A
remote attacker could potentially use these flaws to trigger an
infinite loop in the kernel, resulting in a denial of service on the
system, or cause a denial of service in applications using the edge
triggered epoll functionality. (CVE-2015-5364, CVE-2015-5366,
Important)

Bug Fix(es) :

* Prior to this update, if processes that generate interrupts were
active during the guest shutdown sequence, the virtio driver in some
cases did not correctly clear the interrupts. As a consequence, the
guest kernel became unresponsive, which prevented the shutdown from
completing. With this update, the virtio driver processes interrupts
more effectively, and guests now shut down reliably in the described
scenario. (BZ#1323568)

* At a process or thread exit, when the Linux kernel undoes any SysV
semaphore operations done previously (the ones done using semop with
the SEM_UNDO flag), there was a possible flaw and race with another
process or thread removing the same semaphore set where the operations
occurred, leading to possible use of in-kernel-freed memory and then
to possible unpredictable behavior. This bug could be noticed with
software which uses IPC SysV semaphores, such as IBM DB2, which for
example in certain cases could lead to some of its processes or
utilities to get incorrectly stalled in some IPC semaphore operation
or syscall after the race or problem happened. A patch has been
provided to fix this bug, and the kernel now behaves as expected in
the aforementioned scenario. (BZ#1326341)

See also :

https://www.redhat.com/security/data/cve/CVE-2015-5364.html
https://www.redhat.com/security/data/cve/CVE-2015-5366.html
http://rhn.redhat.com/errata/RHSA-2016-1096.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:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 91307 ()

Bugtraq ID:

CVE ID: CVE-2015-5364
CVE-2015-5366

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