========================================================================== Ubuntu Security Notice USN-2682-1 July 23, 2015 linux-lts-utopic vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the kernel. Software Description: - linux-lts-utopic: Linux hardware enablement kernel from Utopic Details: A flaw was discovered in the kvm (kernel virtual machine) subsystem's kvm_apic_has_events function. A unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4692) A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker could exploit this flaw to cause a denial of service using a flood of UDP packets with invalid checksums. (CVE-2015-5364) A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker can cause a denial of service against applications that use epoll by injecting a single packet with an invalid checksum. (CVE-2015-5366) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.16.0-44-generic 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-generic-lpae 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-lowlatency 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-powerpc-e500mc 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-powerpc-smp 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-powerpc64-emb 3.16.0-44.59~14.04.1 linux-image-3.16.0-44-powerpc64-smp 3.16.0-44.59~14.04.1 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-2682-1 CVE-2015-4692, CVE-2015-5364, CVE-2015-5366 Package Information: https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-44.59~14.04.1