RHSA-2011:0421: 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 flaw was found in the sctpicmpprotounreachable() function in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation.A remote attacker could use this flaw to cause a denial of service.(CVE-2010-4526, Important) A missing boundary check was found in the dvbcaioctl() function in the Linux kernel's av7110 module. On systems that use old DVB cards thatrequire the av7110 module, a local, unprivileged user could use this flawto cause a denial of service or escalate their privileges. (CVE-2011-0521,Important) A race condition was found in the way the Linux kernel's InfiniBand implementation set up new connections. This could allow a remote user tocause a denial of service. (CVE-2011-0695, Important) A heap overflow flaw in the iowarriorwrite() function could allow a user with access to an IO-Warrior USB device, that supports more than 8bytes per report, to cause a denial of service or escalate theirprivileges. (CVE-2010-4656, Moderate) A flaw was found in the way the Linux Ethernet bridge implementation handled certain IGMP (Internet Group Management Protocol) packets. A local,unprivileged user on a system that has a network interface in an Ethernetbridge could use this flaw to crash that system. (CVE-2011-0716, Moderate) A NULL pointer dereference flaw was found in the Generic Receive Offload (GRO) functionality in the Linux kernel's networking implementation. Ifboth GRO and promiscuous mode were enabled on an interface in a virtual LAN(VLAN), it could result in a denial of service when a malformed VLAN frameis received on that interface. (CVE-2011-1478, Moderate) A missing initialization flaw in the Linux kernel could lead to an information leak. (CVE-2010-3296, Low) A missing security check in the Linux kernel's implementation of the installspecialmapping() function could allow a local, unprivileged userto bypass the mmapminaddr protection mechanism. (CVE-2010-4346, Low) A logic error in the orinocoioctlsetauth() function in the Linux kernel's ORiNOCO wireless extensions support implementation could renderTKIP countermeasures ineffective when it is enabled, as it enabled the cardinstead of shutting it down. (CVE-2010-4648, Low) A missing initialization flaw was found in the ethtoolgetregs() function in the Linux kernel's ethtool IOCTL handler. A local user who hasthe CAPNETADMIN capability could use this flaw to cause an informationleak. (CVE-2010-4655, Low) An information leak was found in the Linux kernel's taskshowregs() implementation. On IBM S/390 systems, a local, unprivileged user could usethis flaw to read /proc/[PID]/status files, allowing them to discoverthe CPU register values of processes. (CVE-2011-0710, Low)Red Hat would like to thank Jens Kuehnel for reporting CVE-2011-0695; KeesCook for reporting CVE-2010-4656 and CVE-2010-4655; Dan Rosenberg forreporting CVE-2010-3296; and Tavis Ormandy for reporting CVE-2010-4346.This update also fixes several bugs. Documentation for these bug fixes 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.