(RHSA-2016:0617) Moderate: kernel security and bug fix update

2016-04-12T04:00:00
ID RHSA-2016:0617
Type redhat
Reporter RedHat
Modified 2016-09-04T02:18:37

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

  • It was found that the fix for CVE-2015-1805 incorrectly kept buffer offset and buffer length in sync on a failed atomic read, potentially resulting in a pipe buffer state corruption. A local, unprivileged user could use this flaw to crash the system or leak kernel memory to user space. (CVE-2016-0774, Moderate)

The security impact of this issue was discovered by Red Hat.

Bug Fix(es):

  • Due to prematurely decremented calc_load_task, the calculated load average was off by up to the number of CPUs in the machine. As a consequence, job scheduling worked improperly causing a drop in the system performance. This update keeps the delta of the CPU going into NO_HZ idle separately, and folds the pending idle delta into the global active count while correctly aging the averages for the idle-duration when leaving NO_HZ mode. Now, job scheduling works correctly, ensuring balanced CPU load. (BZ#1308968)

  • Previously, the Stream Control Transmission Protocol (SCTP) retransmission path selection was not fully RFC compliant when Partial Failover had been enabled. The provided patch provides SCTP path selection updates, thus fixing this bug. (BZ#1306565)