Ubuntu Security Notice 6089-1 - It was discovered that the Intel i915 graphics driver in the Linux kernel did not perform a GPU TLB flush in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.
d7733ea3680714a70e7b2c6637cf17a3d21472fdbfbcb86a7d70a45b40c6f4bc