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Ubuntu 15.10: USN-2852-1 Critical: Kernel Namespace Access Threat

The system could be made to provide access outside of namespace sandbox.. =========================================================================Ubuntu Security Notice USN-2852-1 December 19, 2015 linux-raspi2 vulnerability ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 Summary: The system could be made to provide access outside of namespace sandbox. Software Description: - linux-raspi2: Linux kernel for Raspberry Pi 2 Details: Jann Horn discovered a ptrace issue with user namespaces in the Linux kernel. The namespace owner could potentially exploit this flaw by ptracing a root owned process entering the user namespace to elevate its privileges and potentially gain access outside of the namespace. (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527374) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: linux-image-4.2.0-1017-raspi2 4.2.0-1017.24 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 requires you 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-2852-1 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527374 Package Information: https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1017.24 . Ubuntu Security Alert USN-2853-1 highlights a critical kernel flaw enabling unauthorized access to namespaces. Swift action is necessary.. Linux Kernel Security, Ubuntu Kernel Update, RaspberryPi Security, ptrace Vulnerability. . Severity: Critical. LinuxSecurity.com Team

Dec 20, 2015 •Critical Ubuntu