A very serious security problem has been found in the Linux kernel called “The Stack Clash.” It can be exploited by attackers to corrupt memory and execute arbitrary code. An attacker could leverage this with another vulnerability to execute arbitrary code and gain administrative/root account privileges. How do I fix this problem on Linux? The Qualys Research Labs discovered various problems in the dynamic linker of the GNU C Library (CVE- 2. Linux kernel. This bug affects Linux, Open. BSD, Net. BSD, Free. BSD and Solaris, on i.

Is the problem specific to a certain guest OS? Specific release of a guest OS? Especially with Linux guest related problems, the issue may be.

It can be exploited by attackers to corrupt memory and execute arbitrary code. What is CVE- 2. 01. From RHN: A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel- side mitigation which increases the stack guard gap size from one page to 1 Mi.

In this article we will explain how to easily upgrade the Linux kernel on Ubuntu or one of their derivatives such as Debian and Linux Mint. The shell is a command interpreter. More than just the insulating layer between the operating system kernel and the user, it's also a fairly powerful. Images/ where all the images (kernel image, bootloader and root filesystem images) are stored. These are the files you need to put on your target system.

How To Install Kernel Headers Fedora 17 Desktop Drop

B to make successful exploitation of this issue more difficult. As per the original research post: Each program running on a computer uses a special memory region called the stack. This memory region is special because it grows automatically when the program needs more stack memory.

But if it grows too much and gets too close to another memory region, the program may confuse the stack with the other memory region. An attacker can exploit this confusion to overwrite the stack with the other memory region, or the other way around. A list of affected Linux distros. Red Hat Enterprise Linux Server 5.

Red Hat Enterprise Linux Server 6. Red Hat Enterprise Linux Server 7.

Cent. OS Linux Server 5. Cent. OS Linux Server 6. Cent. OS Linux Server 7. Oracle Enterprise Linux Server 5. Phoenix Rc Simulator V3 Cracker. Oracle Enterprise Linux Server 6. Oracle Enterprise Linux Server 7.

Ubuntu 1. 7. 1. 0Ubuntu 1. Ubuntu 1. 6. 1. 0Ubuntu 1. LTSUbuntu 1. 2. 0. ESM (Precise Pangolin)Debian 9 stretch. Debian 8 jessie. Debian 7 wheezy. Debian unstable. SUSE Linux Enterprise Desktop 1.

SP2. SUSE Linux Enterprise High Availability 1. SP2. SUSE Linux Enterprise Live Patching 1. SUSE Linux Enterprise Module for Public Cloud 1. SUSE Linux Enterprise Build System Kit 1. SP2. SUSE Openstack Cloud Magnum Orchestration 7.

SUSE Linux Enterprise Server 1. SP3- LTSSSUSE Linux Enterprise Server 1. SP4. SUSE Linux Enterprise Server 1. SP1- LTSSSUSE Linux Enterprise Server 1. SP2. SUSE Linux Enterprise Server for Raspberry Pi 1. SP2. Do I need to reboot my box?

Yes, as most services depends upon the dynamic linker of the GNU C Library and kernel itself needs to be reloaded in memory. How do I fix CVE- 2. Linux? Type the commands as per your Linux distro.

You need to reboot the box. Before you apply patch, note down your current kernel version: $ uname - a$ uname - mrs. Sample outputs: Linux 4. Done. Building dependency tree. Reading state information.. Done. Calculating upgrade.. Done. The following packages will be upgraded.

Done. Preconfiguring packages .. Preparing to unpack ../libc. Preparing to unpack ../libc- bin. Preparing to unpack ../multiarch- support.

Preparing to unpack ../0- libc- l. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

How to Install or Upgrade to Latest Kernel Version in Cent. OS 7. Although some people use the word Linux to represent the operating system as a whole, it is important to note that, strictly speaking, Linux is only the kernel. On the other hand, a distribution is a fully- functional system built on top of the kernel with a wide variety of application tools and libraries. During normal operations, the kernel is responsible for performing two important tasks: Acting as an interface between the hardware and the software running on the system. Managing system resources as efficiently as possible. To do this, the kernel communicates with the hardware through the drivers that are built into it or those that can be later installed as a module. For example, when an application running on your machine wants to connect to a wireless network, it submits that request to the kernel, which in turns uses the right driver to connect to the network.

Suggested Read: How to Upgrade Kernel in Ubuntu. With new devices and technology coming out periodically, it is important to keep our kernel up to date if we want to make the most of out them. Additionally, updating our kernel will help us to leverage new kernel functions and to protect ourselves from vulnerabilities that have been discovered in previous versions.

Ready to update your kernel on Cent. OS 7 or one of their derivatives such as RHEL 7 and Fedora? If so, keep reading!

Step 1: Checking Installed Kernel Version. When we install a distribution it includes a certain version of the Linux kernel. To show the current version installed on our system we can do.

The following image shows the output of the above command in a Cent. OS 7 server: Check Kernel Version in Cent. OS 7. If we now go to https: //www. One important thing to consider is the life cycle of a kernel version – if the version you are currently using is approaching its end of life, no more bug fixes will be provided after that date. For more info, refer to the kernel Releases page.

Step 2: Upgrading Kernel in Cent. OS 7. Most modern distributions provide a way to upgrade the kernel using a package management system such as yum and an officially- supported repository. However, this will only perform the upgrade to the most recent version available from the distribution’s repositories – not the latest one available in the https: //www. Unfortunately, Red Hat only allows to upgrade the kernel using the former option. As opposed to Red Hat, Cent. OS allows the use of ELRepo, a third- party repository that makes the upgrade to a recent version a kernel. To enable the ELRepo repository on Cent.

OS 7, do. # rpm - -import https: //www. RPM- GPG- KEY- elrepo. Uvh http: //www. elrepo. Enable ELRepo in Cent. OS 7. Once the repository has been enabled, you can use the following command to list the available kernel. This means that the first kernel in the GRUB initial screen will be used as default.

You have upgraded your kernel in Cent. OS 7! Summary. In this article we have explained how to easily upgrade the Linux kernel on your system. There is yet another method which we haven’t covered as it involves compiling the kernel from source, which would deserve an entire book and is not recommended on production systems.

Although it represents one of the best learning experiences and allows for a fine- grained configuration of the kernel, you may render your system unusable and may have to reinstall it from scratch. If you are still interested in building the kernel as a learning experience, you will find instructions on how to do it at the Kernel Newbies page. As always, feel free to use the form below if you have any questions or comments about this article.