Red Hat Security Advisory: kernel security, bug fix, and enhancement update

CVE-2011-4080 — kernel: sysctl: restrict write access to dmesg_restrict CVE-2012-0879 — kernel: block: CLONE_IO io_context refcounting issues CVE-2012-1090 — kernel: cifs: dentry refcount leak when opening a FIFO on lookup leads to panic on unmount CVE-2012-1097 — kernel: regset: Prevent null pointer reference on readonly regsets