Ubuntu Security Notice 3509-3 - USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesystem from being used. This update fixes the problem. Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
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