This script is Copyright (C) 2017 Tenable Network Security, Inc.
The remote Red Hat host is missing one or more security updates.
An update for kernel-rt is now available for Red Hat Enterprise Linux
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
Security Fix(es) :
* Linux kernel built with the Kernel-based Virtual Machine
(CONFIG_KVM) support is vulnerable to a NULL pointer dereference flaw.
It could occur on x86 platform, when emulating an undefined
instruction. An attacker could use this flaw to crash the host kernel
resulting in DoS. (CVE-2016-8630, Important)
* A race condition issue leading to a use-after-free flaw was found in
the way the raw packet sockets implementation in the Linux kernel
networking subsystem handled synchronization while creating the
TPACKET_V3 ring buffer. A local user able to open a raw packet socket
(requires the CAP_NET_RAW capability) could use this flaw to elevate
their privileges on the system. (CVE-2016-8655, Important)
* A flaw was discovered in the Linux kernel's implementation of VFIO.
An attacker issuing an ioctl can create a situation where memory is
corrupted and modify memory outside of the expected area. This may
overwrite kernel memory and subvert kernel execution. (CVE-2016-9083,
* The use of a kzalloc with an integer multiplication allowed an
integer overflow condition to be reached in vfio_pci_intrs.c. This
combined with CVE-2016-9083 may allow an attacker to craft an attack
and use unallocated memory, potentially crashing the machine.
Red Hat would like to thank Philip Pettersson for reporting
Bug Fix(es) :
* Previously, the asynchronous page fault woke code references
spinlocks, which were actually sleeping locks in the RT kernel.
Because of this, when the code was executed from the exception
context, a bug warning appeared on the console. With this update, the
regular wait queue and spinlock code in this area has been modified to
use simple-wait-queue and raw-spinlocks. This code change enables the
asynchronous page fault code to run in a non-preemptable state without
bug warnings. (BZ#1418035)
See also :
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.2
CVSS Temporal Score : 6.5
Public Exploit Available : true