RHSA-2011:0162: Important: 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: A heap overflow flaw was found in the Linux kernel's Transparent Inter-Process Communication protocol (TIPC) implementation. A local,unprivileged user could use this flaw to escalate their privileges.(CVE-2010-3859, Important) Missing sanity checks were found in gdthioctlalloc() in the gdth driver in the Linux kernel. A local user with access to "/dev/gdth" on a 64-bitsystem could use these flaws to cause a denial of service or escalate theirprivileges. (CVE-2010-4157, Moderate) A NULL pointer dereference flaw was found in the Bluetooth HCI UART driver in the Linux kernel. A local, unprivileged user could use this flawto cause a denial of service. (CVE-2010-4242, Moderate) A flaw was found in the Linux kernel's garbage collector for AFUNIX sockets. A local, unprivileged user could use this flaw to trigger adenial of service (out-of-memory condition). (CVE-2010-4249, Moderate) Missing initialization flaws were found in the Linux kernel. A local, unprivileged user could use these flaws to cause information leaks.(CVE-2010-3876, CVE-2010-4072, CVE-2010-4073, CVE-2010-4075, CVE-2010-4080,CVE-2010-4083, CVE-2010-4158, Low)Red Hat would like to thank Alan Cox for reporting CVE-2010-4242; VegardNossum for reporting CVE-2010-4249; Vasiliy Kulikov for reportingCVE-2010-3876; Kees Cook for reporting CVE-2010-4072; and Dan Rosenberg forreporting CVE-2010-4073, CVE-2010-4075, CVE-2010-4080, CVE-2010-4083, andCVE-2010-4158.This update also fixes the following bugs: A flaw was found in the Linux kernel where, if used in conjunction with another flaw that can result in a kernel Oops, could possibly lead toprivilege escalation. It does not affect Red Hat Enterprise Linux 4 as thesysctl paniconoops variable is turned on by default. However, as apreventive measure if the variable is turned off by an administrator, thisupdate addresses the issue. Red Hat would like to thank Nelson Elhage forreporting this vulnerability. (BZ#659568) On Intel I/O Controller Hub 9 (ICH9) hardware, jumbo frame support is achieved by using page-based skbuff buffers without any packet split. Theentire frame data is copied to the page(s) rather than some to theskb->data area and some to the page(s) when performing a typicalpacket-split. This caused problems with the filtering code and frames weregetting dropped before they were received by listening applications. Thisbug could eventually lead to the IP address being released and not beingable to be re-acquired from DHCP if the MTU (Maximum Transfer Unit) waschanged (for an affected interface using the e1000e driver). With thisupdate, frames are no longer dropped and an IP address is correctlyre-acquired after a previous release. (BZ#664667)Users should upgrade to these updated packages, which contain backportedpatches to correct these issues. The system must be rebooted for thisupdate to take effect.