========================================================================== Ubuntu Security Notice USN-1696-1 January 18, 2013 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: Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual machine) subsystem's handling of the XSAVE CPU feature. On hosts without the XSAVE CPU feature, using qemu userspace, an unprivileged local attacker could exploit this flaw to crash the system. (CVE-2012-4461) A flaw was discovered in the Linux kernel's handling of script execution when module loading is enabled. A local attacker could exploit this flaw to cause a leak of kernel stack contents. (CVE-2012-4530) Florian Weimer discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating source addresses of netlink packets. An untrusted local user can cause a denial of service by causing hypervkvpd to exit. (CVE-2012-5532) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 LTS: linux-image-3.2.0-36-generic 3.2.0-36.57 linux-image-3.2.0-36-generic-pae 3.2.0-36.57 linux-image-3.2.0-36-highbank 3.2.0-36.57 linux-image-3.2.0-36-omap 3.2.0-36.57 linux-image-3.2.0-36-powerpc-smp 3.2.0-36.57 linux-image-3.2.0-36-powerpc64-smp 3.2.0-36.57 linux-image-3.2.0-36-virtual 3.2.0-36.57 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. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well. References: http://www.ubuntu.com/usn/usn-1696-1 CVE-2012-4461, CVE-2012-4530, CVE-2012-5532 Package Information: https://launchpad.net/ubuntu/+source/linux/3.2.0-36.57
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