RHSA-2010:0882: 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: An array index error was found in the gdth driver in the Linux kernel. A local user could send a specially-crafted IOCTL request that would cause adenial of service or, possibly, privilege escalation. (CVE-2009-3080,Important) NULL pointer dereference flaws were found in the r128 driver in the Linux kernel. Checks to test if the Concurrent Command Engine state wasinitialized were missing in private IOCTL functions. An attacker could usethese flaws to cause a local denial of service or escalate theirprivileges. (CVE-2009-3620, Important) A flaw was found in the Intel PRO/1000 Linux driver, e1000, in the Linux kernel. A remote attacker using packets larger than the MTU could bypassthe existing fragment check, resulting in partial, invalid frames beingpassed to the network stack. This flaw could also possibly be used totrigger a remote denial of service. (CVE-2009-4536, Important) A use-after-free flaw was found in the tcprcvstateprocess() function in the Linux kernel TCP/IP protocol suite implementation. If a system usingIPv6 had the IPV6PKTINFO option set on a listening socket, a remoteattacker could send an IPv6 packet to that system, causing a kernel panic(denial of service). (CVE-2010-1188, Important) When an application has a stack overflow, the stack could silently overwrite another memory mapped area instead of a segmentation faultoccurring, which could cause an application to execute arbitrary code,possibly leading to privilege escalation. It is known that the X WindowSystem server can be used to trigger this flaw. (CVE-2010-2240, Important) The compatallocuserspace() function in the Linux kernel 32/64-bit compatibility layer implementation was missing sanity checks. This functioncould be abused in other areas of the Linux kernel. On 64-bit systems, alocal, unprivileged user could use this flaw to escalate their privileges.(CVE-2010-3081, Important)Red Hat would like to thank the X.Org security team for reporting theCVE-2010-2240 issue, with upstream acknowledging Rafal Wojtczuk as theoriginal reporter; and Ben Hawkes for reporting the CVE-2010-3081 issue.This update also fixes the following bug: The RHSA-2009:1550 kernel update introduced a regression that prevented certain custom kernel modules from loading, failing with "unresolvedsymbol" errors. This update corrects this issue, allowing the affectedmodules to load as expected. (BZ#556909)Users should upgrade to these updated packages, which contain backportedpatches to correct these issues. The system must be rebooted for thisupdate to take effect.