Red Hat has released a kernel update for RHEL 6
===================================================================== Red Hat Security Advisory Synopsis: Moderate: kernel security, bug fix, and enhancement update Advisory ID: RHSA-2011:1106-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1106.html Issue date: 2011-08-02 CVE Names: CVE-2011-1576 ===================================================================== 1. Summary: Updated kernel packages that fix one security issue, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.0 Extended Update Support. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Server (v. 6.0.z) - i386, noarch, ppc64, s390x, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issue: * A flaw allowed napi_reuse_skb() to be called on VLAN (virtual LAN) packets. An attacker on the local network could trigger this flaw by sending specially-crafted packets to a target system, possibly causing a denial of service. (CVE-2011-1576, Moderate) Red Hat would like to thank Ryan Sweat for reporting this issue. This update also fixes the following bugs: * The LSI SAS2 controller firmware issued an 0x620f fault while performing I/O operations and with a Task Manager running, causing possible data corruption. This update corrects this issue. (BZ#710625) * The crashkernel memory region can overlap the RunTime Abstraction Services (RTAS) memory region. If the crashkernel memory region was freed, the RTAS memory region was freed as well and the system would crash. With this update, the crash_free_reserved_phys_range() function is overridden and overlaps with the RTAS memory region are checked so that system crashes no longer occur. (BZ#710626) * If the microcode module was loaded, saving and restoring a Xen guest returned a warning message and a backtrace error. With this update, backtrace errors are no longer returned, and saving and restoring a Xen guest works as expected. (BZ#710632) * When the Distributed Lock Manager (DLM) queued three callbacks for a lock in the following sequence: blocking - completion - blocking, it would consider the final blocking callback redundant and skip it. Because the callback was skipped, GFS would not release the lock, causing processes on other nodes to wait indefinitely for it. With this update, the DLM does not skip the necessary blocking callback. (BZ#710642) * The XFRM_SUB_POLICY feature causes all bundles to be at the finest granularity possible. As a result of the data structure used to implement this, the system performance would drop considerably. This update disables a part of XFRM_SUB_POLICY, eliminating the poor performance at the cost of sub-IP address selection granularity in the policy. (BZ#710645) * A kernel panic in the mpt2sas driver could occur on an IBM system using a drive with SMART (Self-Monitoring, Analysis and Reporting Technology) issues. This was because the driver was sending an SEP request while the kernel was in the interrupt context, causing the driver to enter the sleep state. With this update, a fake event is now executed from the interrupt context, assuring the SEP request is properly issued. (BZ#714189) Finally, this update provides the following enhancements: * This update introduces a kernel module option that allows the Flow Director to be disabled. (BZ#711549) * This update introduces parallel port printer support for Red Hat Enterprise Linux 6. (BZ#713825) * This update restricts access to the /proc/kcore file to ELF headers only. (BZ#710638) Users should upgrade to these updated packages, which contain backported patches to resolve these issues and add these enhancements. The system must be rebooted for this update to take effect. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259 To install kernel packages manually, use "rpm -ivh [package]". Do not use "rpm -Uvh" as that will remove the running kernel binaries from your system. You may use "rpm -e" to remove old kernels after determining that the new kernel functions properly on your system. 5. Bugs fixed (http://bugzilla.redhat.com/): 695173 - CVE-2011-1576 kernel: net: Fix memory leak/corruption on VLAN GRO_DROP 710632 - xen microcode WARN on save-restore 710638 - kernel: restrict access to /proc/kcore to just elf headers [rhel-6.0.z] 710642 - GFS2: inode glock stuck without holder 710645 - Big performance regression found on connect/request/response test through IPSEC (openswan) transport 713825 - Parallel port issue in RHEL 6.0 server 714189 - System Hang when there is smart error on IBM platform 6. Package List: Red Hat Enterprise Linux Server (v. 6.0.z): Source: kernel-2.6.32-71.34.1.el6.src.rpm i386: kernel-2.6.32-71.34.1.el6.i686.rpm kernel-debug-2.6.32-71.34.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-71.34.1.el6.i686.rpm kernel-debug-devel-2.6.32-71.34.1.el6.i686.rpm kernel-debuginfo-2.6.32-71.34.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-71.34.1.el6.i686.rpm kernel-devel-2.6.32-71.34.1.el6.i686.rpm kernel-headers-2.6.32-71.34.1.el6.i686.rpm noarch: kernel-doc-2.6.32-71.34.1.el6.noarch.rpm kernel-firmware-2.6.32-71.34.1.el6.noarch.rpm perf-2.6.32-71.34.1.el6.noarch.rpm ppc64: kernel-2.6.32-71.34.1.el6.ppc64.rpm kernel-bootwrapper-2.6.32-71.34.1.el6.ppc64.rpm kernel-debug-2.6.32-71.34.1.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-71.34.1.el6.ppc64.rpm kernel-debug-devel-2.6.32-71.34.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-71.34.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-71.34.1.el6.ppc64.rpm kernel-devel-2.6.32-71.34.1.el6.ppc64.rpm kernel-headers-2.6.32-71.34.1.el6.ppc64.rpm s390x: kernel-2.6.32-71.34.1.el6.s390x.rpm kernel-debug-2.6.32-71.34.1.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-71.34.1.el6.s390x.rpm kernel-debug-devel-2.6.32-71.34.1.el6.s390x.rpm kernel-debuginfo-2.6.32-71.34.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-71.34.1.el6.s390x.rpm kernel-devel-2.6.32-71.34.1.el6.s390x.rpm kernel-headers-2.6.32-71.34.1.el6.s390x.rpm kernel-kdump-2.6.32-71.34.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-71.34.1.el6.s390x.rpm kernel-kdump-devel-2.6.32-71.34.1.el6.s390x.rpm x86_64: kernel-2.6.32-71.34.1.el6.x86_64.rpm kernel-debug-2.6.32-71.34.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-71.34.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-71.34.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-71.34.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-71.34.1.el6.x86_64.rpm kernel-devel-2.6.32-71.34.1.el6.x86_64.rpm kernel-headers-2.6.32-71.34.1.el6.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2011-1576.html https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2011 Red Hat, Inc.