Ubuntu Security Notice 4017-2 - USN-4017-1 fixed vulnerabilities in the Linux kernel for Ubuntu. This update provides the corresponding updates for the Linux kernel for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM. Jonathan Looney discovered that the TCP retransmission queue implementation in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment sequences. A remote attacker could use this to cause a denial of service. Various other issues were also addressed.
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