RHSA-2011:0429: 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 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) An inconsistency was found in the interaction between the Linux kernel's method for allocating NFSv4 (Network File System version 4) ACL data andthe method by which it was freed. This inconsistency led to a kernel panicwhich could be triggered by a local, unprivileged user with files owned bysaid user on an NFSv4 share. (CVE-2011-1090, 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 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) 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 discover theCPU register values of processes. (CVE-2011-0710, Low) A missing validation check was found in the Linux kernel's macpartition() implementation, used for supporting file systems createdon Mac OS operating systems. A local attacker could use this flaw to causea denial of service by mounting a disk that contains specially-craftedpartitions. (CVE-2011-1010, Low)Red Hat would like to thank Ryan Sweat for reporting CVE-2011-1478; TavisOrmandy for reporting CVE-2010-4346; and Timo Warns for reportingCVE-2011-1010.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.