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Ubuntu 12.04 LTS USN-2846-1 Critical Kernel Denial Of Service

Several security issues were fixed in the kernel.. =========================================================================Ubuntu Security Notice USN-2846-1 December 19, 2015 linux vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 LTS Summary: Several security issues were fixed in the kernel. Software Description: - linux: Linux kernel Details: Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of service (crash the host) or potentially execute arbitrary code on the host. (CVE-2015-8550) Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform sanity checks on the device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the host. (CVE-2015-8551) Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform sanity checks on the device's state. An attacker could exploit this flaw to cause a denial of service by flooding the logging system with WARN() messages causing the initial domain to exhaust disk space. (CVE-2015-8552) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 LTS: linux-image-3.2.0-97-generic 3.2.0-97.137 linux-image-3.2.0-97-generic-pae 3.2.0-97.137 linux-image-3.2.0-97-highbank 3.2.0-97.137 linux-image-3.2.0-97-omap 3.2.0-97.137 linux-image-3.2.0-97-powerpc-smp 3.2.0-97.137 linux-image-3.2.0-97-powerpc64-smp 3.2.0-97.137 linux-image-3.2.0-97-virtual 3.2.0-97.137 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requiresyou to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-2846-1 CVE-2015-8550, CVE-2015-8551, CVE-2015-8552 Package Information: https://launchpad.net/ubuntu/+source/linux/3.2.0-97.137 . Essential patches for Ubuntu address kernel vulnerabilities that lead to service interruptions and possible breaches. Protect your system immediately.. kernel exploits, ubuntu security updates, xen vulnerabilities. . Severity: Critical. LinuxSecurity.com Team

Dec 20, 2015 •Critical Ubuntu