Red Hat Security Advisory: kernel security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:0571 Final 1 1 2012-05-15T19:37:00Z Current version 2012-05-15T19:37:00Z 2012-05-15T19:37:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-05-15T23:21:01Z Updated kernel packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * A flaw was found in the way the Linux kernel's journal_unmap_buffer() function handled buffer head states. On systems that have an ext4 file system with a journal mounted, a local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-4086, Moderate) * A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled. Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A local, unprivileged user on a KVM host could use this flaw to crash the host. (CVE-2012-1601, Moderate) This update also fixes several bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section. Users should upgrade to these updated packages, which contain backported patches to correct these issues, and fix the bugs noted in the Technical Notes. The system must be rebooted for this update to take effect. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate https://rhn.redhat.com/errata/RHSA-2012-0571.html https://rhn.redhat.com/errata/RHSA-2012-0571.html https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/updates/classification/#moderate https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_Technical_Notes/kernel.html#RHSA-2012-0571 https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_Technical_Notes/kernel.html#RHSA-2012-0571 https://bugzilla.redhat.com/show_bug.cgi?id=809374 https://bugzilla.redhat.com/show_bug.cgi?id=809374 https://bugzilla.redhat.com/show_bug.cgi?id=811135 https://bugzilla.redhat.com/show_bug.cgi?id=811135 https://bugzilla.redhat.com/show_bug.cgi?id=811299 https://bugzilla.redhat.com/show_bug.cgi?id=811299 Red Hat Enterprise Linux Workstation Optional (v. 6) Red Hat Enterprise Linux HPC Node (v. 6) Red Hat Enterprise Linux Desktop (v. 6) Red Hat Enterprise Linux Server Optional (v. 6) Red Hat Enterprise Linux HPC Node Optional (v. 6) Red Hat Enterprise Linux Server (v. 6) Red Hat Enterprise Linux Workstation (v. 6) Red Hat Enterprise Linux Desktop Optional (v. 6) kernel-2.6.32-220.17.1.el6.src.rpm kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Server Optional (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-220.17.1.el6 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) A flaw was found in the way the Linux kernel's journal_unmap_buffer() function handled buffer head states. On systems that have an ext4 file system with a journal mounted, a local, unprivileged user could use this flaw to cause a denial of service. 2011-10-26T00:00:00Z 2012-01-25T00:00:00Z CVE-2011-4086 6Client-6.2.z:kernel-2.6.32-220.17.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.17.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6Server-6.2.z:kernel-2.6.32-220.17.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.17.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.17.1.el6 Moderate 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C 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/knowledge/articles/11258 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. https://rhn.redhat.com/errata/RHSA-2012-0571.html https://www.redhat.com/security/data/cve/CVE-2011-4086.html CVE-2011-4086 https://bugzilla.redhat.com/show_bug.cgi?id=749143 bz#749143: CVE-2011-4086 kernel: jbd2: unmapped buffer with _Unwritten or _Delay flags set can lead to DoS A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled. Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A local, unprivileged user on a KVM host could use this flaw to crash the host. 2012-03-07T00:00:00Z 2012-02-07T00:00:00Z CVE-2012-1601 6Client-6.2.z:kernel-2.6.32-220.17.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.17.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6Server-6.2.z:kernel-2.6.32-220.17.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.17.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.17.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.17.1.el6 Moderate 4 AV:L/AC:H/Au:N/C:N/I:N/A:C 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/knowledge/articles/11258 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. https://rhn.redhat.com/errata/RHSA-2012-0571.html https://www.redhat.com/security/data/cve/CVE-2012-1601.html CVE-2012-1601 https://bugzilla.redhat.com/show_bug.cgi?id=808199 bz#808199: CVE-2012-1601 kernel: kvm: irqchip_in_kernel() and vcpu->arch.apic inconsistency