RHSA-2011:1530: Moderate: Red Hat Enterprise Linux 6 kernel security, bug fix and enhancement 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 flaw was found in the Linux kernel in the way splitting two extents in ext4extconverttoinitialized() worked. A local, unprivileged user withaccess to mount and unmount ext4 file systems could use this flaw to causea 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 hundred bugs and adds enhancements. Refer tothe Red Hat Enterprise Linux 6.2 Release Notes for information on the mostsignificant of these changes, and the Technical Notes for furtherinformation, both linked to in the References.All Red Hat Enterprise Linux 6 users are advised to install these updatedpackages, which correct these issues, and fix the bugs and add theenhancements noted in the Red Hat Enterprise Linux 6.2 Release Notes andTechnical Notes. The system must be rebooted for this update to takeeffect.