RHSA-2017:0323: Important: kernel security update

The kernel packages contain the Linux kernel, the core of any Linux operatingsystem.Security Fix(es): A use-after-free flaw was found in the way the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer)resources for a DCCPPKTREQUEST packet when the IPV6RECVPKTINFO option is seton the socket. A local, unprivileged user could use this flaw to alter thekernel memory, allowing them to escalate their privileges on the system.(CVE-2017-6074, Important) It was found that the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation used the IPv4-only inetskrebuildheader() function forboth IPv4 and IPv6 DCCP connections, which could result in memory corruptions. Aremote attacker could use this flaw to crash the system. (CVE-2017-2634,Moderate)Important: This update disables the DCCP kernel module at load time by using thekernel module blacklist method. The module is disabled in an attempt to reducefurther exposure to additional issues. Please see Red Hat Bugzilla (BZ#1425177)for additional information.Red Hat would like to thank Andrey Konovalov (Google) for reportingCVE-2017-6074. The CVE-2017-2634 issue was discovered by Wade Mealing (Red HatProduct Security).