RHSA-2010:0178: Important: Red Hat Enterprise Linux 5.5 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 race condition was found in the mac80211 implementation, a framework used for writing drivers for wireless devices. An attacker could triggerthis flaw by sending a Delete Block ACK (DELBA) packet to a target system,resulting in a remote denial of service. Note: This issue only affectedusers on 802.11n networks, and that also use the iwlagn driver with Intelwireless hardware. (CVE-2009-4027, Important) a flaw was found in the gfs2lock() implementation. The GFS2 locking code could skip the lock operation for files that have the SISGID bit(set-group-ID on execution) in their mode set. A local, unprivileged useron a system that has a GFS2 file system mounted could use this flaw tocause a kernel panic. (CVE-2010-0727, Moderate) a divide-by-zero flaw was found in the ext4 file system code. A local attacker could use this flaw to cause a denial of service by mounting aspecially-crafted ext4 file system. (CVE-2009-4307, Low)These updated packages also include several hundred bug fixes for andenhancements to the Linux kernel. Space precludes documenting each of thesechanges in this advisory and users are directed to the Red Hat EnterpriseLinux 5.5 Release Notes for information on the most significant of thesechanges:http://www.redhat.com/docs/en-US/RedHatEnterpriseLinux/5.5/html/ReleaseNotes/ Also, for details concerning every bug fixed in and every enhancement addedto the kernel for this release, refer to the kernel chapter in the Red HatEnterprise Linux 5.5 Technical Notes:http://www.redhat.com/docs/en-US/RedHatEnterpriseLinux/5.5/html/TechnicalNotes/kernel.html All Red Hat Enterprise Linux 5 users are advised to install these updatedpackages, which address these vulnerabilities as well as fixing the bugsand adding the enhancements noted in the Red Hat Enterprise Linux 5.5Release Notes and Technical Notes. The system must be rebooted for thisupdate to take effect.