Today, October 11, 2016, Canonical published several security advisories to inform Ubuntu users about new Linux kernel updates for their supported operating systems.
Four new kernel vulnerabilities are affecting Ubuntu 16.04 LTS (Xenial Xerus) and Ubuntu 14.04 LTS (Trusty Tahr) or later versions, and three the Ubuntu 12.04 LTS (Precise Pangolin) series of operating systems. They are also affecting the Ubuntu 16.04 LTS for Raspberry Pi 2 kernel.
The first security flaw is an unbounded recursion in Linux kernel’s VLAN and TEB Generic Receive Offload (GRO) processing implementations, which could have allowed a remote attacker to crash the system through a denial of service or cause a stack corruption. It was discovered by Vladimír Beneš and affects Ubuntu 16.04 and 14.04.
The second vulnerability is a use-after-free condition in Linux kernel’s TCP retransmit queue handling code, which could have allowed a local attacker to crash the system through a denial of service… (read more)
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