USN-2843-2: Linux kernel (Wily HWE) vulnerabilities
17 December 2015
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Several security issues were fixed in the kernel.
- linux-lts-wily - Linux hardware enablement kernel from Wily
Jan Beulich discovered that the KVM svm hypervisor implementation in the Linux kernel did not properly catch Debug exceptions on AMD processors. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the host OS. (CVE-2015-8104)
郭永刚 discovered that the ppp implementation in the Linux kernel did not ensure that certain slot numbers are valid. A local attacker with the privilege to call ioctl() on /dev/ppp could cause a denial of service (system crash). (CVE-2015-7799)
Dmitry Vyukov discovered that the Linux kernel’s keyring handler attempted to garbage collect incompletely instantiated keys. A local unprivileged attacker could use this to cause a denial of service (system crash). (CVE-2015-7872)
It was discovered that the virtual video osd test driver in the Linux kernel did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7884)
It was discovered that the driver for Digi Neo and ClassicBoard devices did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7885)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.04 LTS
- linux-image-4.2.0-21-generic - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-generic-lpae - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-lowlatency - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-powerpc-e500mc - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-powerpc-smp - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-powerpc64-emb - 4.2.0-21.25~14.04.1
- linux-image-4.2.0-21-powerpc64-smp - 4.2.0-21.25~14.04.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.