kernel: multiple vulnerabilities

From the Ubuntu advisory:

It was discovered that named pipes did not correctly handle certain fcntl calls. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2010-4256)

It was discovered that the key-based DNS resolver did not correctly handle certain error states. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-1076)