(RHSA-2015:1190) Important: kernel security and bug fix update

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

• It was found that the Linux kernel’s implementation of vectored pipe read
  and write functionality did not take into account the I/O vectors that were
  already processed when retrying after a failed atomic access operation,
  potentially resulting in memory corruption due to an I/O vector array
  overrun. A local, unprivileged user could use this flaw to crash the system
  or, potentially, escalate their privileges on the system. (CVE-2015-1805,
  Important)

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

This update also fixes the following bug:

• Previously, the signal delivery paths did not clear the TS_USEDFPU flag,
  which could cause problems in the switch_to() function and lead to
  floating-point unit (FPU) corruption. With this update, TS_USEDFPU is
  cleared as expected, and FPU is no longer under threat of corruption.
  (BZ#1214237)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.