RHSA-2012:1426: Moderate: 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 use-after-free flaw was found in the Linux kernel's memory management subsystem in the way quota handling for huge pages was performed. A local,unprivileged user could use this flaw to cause a denial of service or,potentially, escalate their privileges. (CVE-2012-2133, Moderate) A use-after-free flaw was found in the madvise() system call implementation in the Linux kernel. A local, unprivileged user could usethis flaw to cause a denial of service or, potentially, escalate theirprivileges. (CVE-2012-3511, Moderate) It was found that when running a 32-bit binary that uses a large number of shared libraries, one of the libraries would always be loaded at apredictable address in memory. An attacker could use this flaw to bypassthe Address Space Layout Randomization (ASLR) security feature.(CVE-2012-1568, Low) Buffer overflow flaws were found in the udfloadlogicalvol() function in the Universal Disk Format (UDF) file system implementation in the Linuxkernel. An attacker with physical access to a system could use these flawsto cause a denial of service or escalate their privileges. (CVE-2012-3400,Low)Red Hat would like to thank Shachar Raindel for reporting CVE-2012-2133.This update also fixes several bugs. Documentation for these changes 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.