Red Hat Security Advisory: kernel security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:1366 Final 1 1 2012-10-16T13:12:00Z Current version 2012-10-16T13:12:00Z 2012-10-16T13:12:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-10-16T14:44:02Z Updated kernel packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having important 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. The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issue: * A flaw was found in the way socket buffers (skb) requiring TSO (TCP segment offloading) were handled by the sfc driver. If the skb did not fit within the minimum-size of the transmission queue, the network card could repeatedly reset itself. A remote attacker could use this flaw to cause a denial of service. (CVE-2012-3412, Important) Red Hat would like to thank Ben Hutchings of Solarflare (tm) for reporting this issue. 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 this issue, 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. Important https://rhn.redhat.com/errata/RHSA-2012-1366.html https://rhn.redhat.com/errata/RHSA-2012-1366.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/kernel.html#RHSA-2012-1366 https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/kernel.html#RHSA-2012-1366 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) 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) kernel-2.6.32-279.11.1.el6.src.rpm kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-279.11.1.el6 as a component of Red Hat Enterprise Linux Server Optional (v. 6) A flaw was found in the way socket buffers (skb) requiring TSO (TCP segment offloading) were handled by the sfc driver. If the skb did not fit within the minimum-size of the transmission queue, the network card could repeatedly reset itself. A remote attacker could use this flaw to cause a denial of service. 2012-07-11T00:00:00Z 2012-07-30T00:00:00Z CVE-2012-3412 6Client-6.3.z:kernel-2.6.32-279.11.1.el6 6Client-optional-6.3.z:kernel-2.6.32-279.11.1.el6 6ComputeNode-6.3.z:kernel-2.6.32-279.11.1.el6 6ComputeNode-optional-6.3.z:kernel-2.6.32-279.11.1.el6 6Server-6.3.z:kernel-2.6.32-279.11.1.el6 6Server-optional-6.3.z:kernel-2.6.32-279.11.1.el6 6Workstation-6.3.z:kernel-2.6.32-279.11.1.el6 6Workstation-optional-6.3.z:kernel-2.6.32-279.11.1.el6 Important 7.1 AV:N/AC:M/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-2012-1366.html https://www.redhat.com/security/data/cve/CVE-2012-3412.html CVE-2012-3412 https://bugzilla.redhat.com/show_bug.cgi?id=844714 bz#844714: CVE-2012-3412 kernel: sfc: potential remote denial of service through TCP MSS option Red Hat would like to thank Ben Hutchings of Solarflare (tm) for reporting this issue.