RHSA-2012:0116: Moderate: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linuxoperating system.This update fixes the following security issues: The proc file system could allow a local, unprivileged user to obtain sensitive information or possibly cause integrity issues. (CVE-2011-1020,Moderate) Non-member VLAN (virtual LAN) packet handling for interfaces in promiscuous mode and also using the be2net driver could allow an attackeron the local network to cause a denial of service. (CVE-2011-3347,Moderate) A missing validation flaw was found in the Linux kernel's mstop() implementation. A local, unprivileged user could use this flaw to triggera denial of service. (CVE-2011-3637, Moderate) A flaw was found in the Linux kernel in the way splitting two extents in ext4extconverttoinitialized() worked. A local, unprivileged user withthe ability to mount and unmount ext4 file systems could use this flaw tocause a denial of service. (CVE-2011-3638, Moderate) A NULL pointer dereference flaw was found in the way the Linux kernel's key management facility handled user-defined key types. A local,unprivileged user could use the keyctl utility to cause a denial ofservice. (CVE-2011-4110, Moderate)Red Hat would like to thank Kees Cook for reporting CVE-2011-1020; SomnathKotur for reporting CVE-2011-3347; and Zheng Liu for reportingCVE-2011-3638.This update also fixes several bugs. Documentation for these changes willbe available shortly from the Technical Notes document linked to in theReferences section.Users should upgrade to these updated packages, which contain backportedpatches to correct these issues, and fix the bugs noted in the TechnicalNotes. The system must be rebooted for this update to take effect.