Red Hat Security Advisory: kernel security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:0743 Final 1 1 2012-06-18T12:12:00Z Current version 2012-06-18T12:12:00Z 2012-06-18T12:12:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-06-18T13:35:02Z Updated kernel packages that fix multiple 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 important 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 local, unprivileged user could use an integer overflow flaw in drm_mode_dirtyfb_ioctl() to cause a denial of service or escalate their privileges. (CVE-2012-0044, Important) * A buffer overflow flaw was found in the macvtap device driver, used for creating a bridged network between the guest and the host in KVM (Kernel-based Virtual Machine) environments. A privileged guest user in a KVM guest could use this flaw to crash the host. Note: This issue only affected hosts that have the vhost_net module loaded with the experimental_zcopytx module option enabled (it is not enabled by default), and that also have macvtap configured for at least one guest. (CVE-2012-2119, Important) * When a set user ID (setuid) application is executed, certain personality flags for controlling the application's behavior are cleared (that is, a privileged application will not be affected by those flags). It was found that those flags were not cleared if the application was made privileged via file system capabilities. A local, unprivileged user could use this flaw to change the behavior of such applications, allowing them to bypass intended restrictions. Note that for default installations, no application shipped by Red Hat for Red Hat Enterprise Linux is made privileged via file system capabilities. (CVE-2012-2123, Important) * It was found that the data_len parameter of the sock_alloc_send_pskb() function in the Linux kernel's networking implementation was not validated before use. A privileged guest user in a KVM guest could use this flaw to crash the host or, possibly, escalate their privileges on the host. (CVE-2012-2136, Important) * A buffer overflow flaw was found in the setup_routing_entry() function in the KVM subsystem of the Linux kernel in the way the Message Signaled Interrupts (MSI) routing entry was handled. A local, unprivileged user could use this flaw to cause a denial of service or, possibly, escalate their privileges. (CVE-2012-2137, Important) * A race condition was found in the Linux kernel's memory management subsystem in the way pmd_none_or_clear_bad(), when called with mmap_sem in read mode, and Transparent Huge Pages (THP) page faults interacted. A privileged user in a KVM guest with the ballooning functionality enabled could potentially use this flaw to crash the host. A local, unprivileged user could use this flaw to crash the system. (CVE-2012-1179, Moderate) * A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user on a KVM host who has the ability to assign a device to a guest could use this flaw to crash the host. (CVE-2012-2121, Moderate) * A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-2372, Moderate) * A race condition was found in the Linux kernel's memory management subsystem in the way pmd_populate() and pte_offset_map_lock() interacted on 32-bit x86 systems with more than 4GB of RAM. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-2373, Moderate) Red Hat would like to thank Chen Haogang for reporting CVE-2012-0044. 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. Important https://rhn.redhat.com/errata/RHSA-2012-0743.html https://rhn.redhat.com/errata/RHSA-2012-0743.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/updates/classification/#important https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_Technical_Notes/kernel.html#RHSA-2012-0743 https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_Technical_Notes/kernel.html#RHSA-2012-0743 https://bugzilla.redhat.com/show_bug.cgi?id=814657 https://bugzilla.redhat.com/show_bug.cgi?id=814657 https://bugzilla.redhat.com/show_bug.cgi?id=816226 https://bugzilla.redhat.com/show_bug.cgi?id=816226 https://bugzilla.redhat.com/show_bug.cgi?id=818504 https://bugzilla.redhat.com/show_bug.cgi?id=818504 https://bugzilla.redhat.com/show_bug.cgi?id=818505 https://bugzilla.redhat.com/show_bug.cgi?id=818505 https://bugzilla.redhat.com/show_bug.cgi?id=819614 https://bugzilla.redhat.com/show_bug.cgi?id=819614 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-2.6.32-220.23.1.el6.src.rpm kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Server Optional (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-220.23.1.el6 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) A local, unprivileged user could use an integer overflow flaw in drm_mode_dirtyfb_ioctl() to cause a denial of service or escalate their privileges. 2012-01-10T00:00:00Z 2011-11-23T00:00:00Z CVE-2012-0044 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Important 6.9 AV:L/AC:M/Au:N/C:C/I:C/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-0044.html CVE-2012-0044 https://bugzilla.redhat.com/show_bug.cgi?id=772894 bz#772894: CVE-2012-0044 kernel: drm: integer overflow in drm_mode_dirtyfb_ioctl() Red Hat would like to thank Chen Haogang for reporting this issue. A race condition was found in the Linux kernel's memory management subsystem in the way pmd_none_or_clear_bad(), when called with mmap_sem in read mode, and Transparent Huge Pages (THP) page faults interacted. A privileged user in a KVM guest with the ballooning functionality enabled could potentially use this flaw to crash the host. A local, unprivileged user could use this flaw to crash the system. 2012-03-12T00:00:00Z 2012-03-15T00:00:00Z CVE-2012-1179 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Moderate 5.2 AV:A/AC:M/Au:S/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-1179.html CVE-2012-1179 https://bugzilla.redhat.com/show_bug.cgi?id=803793 bz#803793: CVE-2012-1179 kernel: thp:__split_huge_page() mapcount != page_mapcount BUG_ON() A buffer overflow flaw was found in the macvtap device driver, used for creating a bridged network between the guest and the host in KVM (Kernel-based Virtual Machine) environments. A privileged guest user in a KVM guest could use this flaw to crash the host. Note: This issue only affected hosts that have the vhost_net module loaded with the experimental_zcopytx module option enabled (it is not enabled by default), and that also have macvtap configured for at least one guest. 2012-04-16T00:00:00Z 2012-04-16T00:00:00Z CVE-2012-2119 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Important 5.2 AV:A/AC:M/Au:S/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2119.html CVE-2012-2119 https://bugzilla.redhat.com/show_bug.cgi?id=814278 bz#814278: CVE-2012-2119 kernel: macvtap: zerocopy: vector length is not validated before pinning user pages A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user on a KVM host who has the ability to assign a device to a guest could use this flaw to crash the host. 2012-04-11T00:00:00Z 2012-03-29T00:00:00Z CVE-2012-2121 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Moderate 4.7 AV:L/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2121.html CVE-2012-2121 https://bugzilla.redhat.com/show_bug.cgi?id=814149 bz#814149: CVE-2012-2121 kvm: device assignment page leak When a set user ID (setuid) application is executed, certain personality flags for controlling the application's behavior are cleared (that is, a privileged application will not be affected by those flags). It was found that those flags were not cleared if the application was made privileged via file system capabilities. A local, unprivileged user could use this flaw to change the behavior of such applications, allowing them to bypass intended restrictions. Note that for default installations, no application shipped by Red Hat for Red Hat Enterprise Linux is made privileged via file system capabilities. 2012-03-26T00:00:00Z 2012-04-17T00:00:00Z CVE-2012-2123 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Important 1.9 AV:L/AC:M/Au:N/C:N/I:P/A:N 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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2123.html CVE-2012-2123 https://bugzilla.redhat.com/show_bug.cgi?id=806722 bz#806722: CVE-2012-2123 kernel: fcaps: clear the same personality flags as suid when fcaps are used It was found that the data_len parameter of the sock_alloc_send_pskb() function in the Linux kernel's networking implementation was not validated before use. A privileged guest user in a KVM guest could use this flaw to crash the host or, possibly, escalate their privileges on the host. 2012-04-19T00:00:00Z 2012-05-29T00:00:00Z CVE-2012-2136 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Important 6.2 AV:L/AC:H/Au:N/C:C/I:C/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2136.html CVE-2012-2136 https://bugzilla.redhat.com/show_bug.cgi?id=816289 bz#816289: CVE-2012-2136 kernel: net: insufficient data_len validation in sock_alloc_send_pskb() A buffer overflow flaw was found in the setup_routing_entry() function in the KVM subsystem of the Linux kernel in the way the Message Signaled Interrupts (MSI) routing entry was handled. A local, unprivileged user could use this flaw to cause a denial of service or, possibly, escalate their privileges. 2012-04-18T00:00:00Z 2012-06-05T00:00:00Z CVE-2012-2137 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.el6 Important 6.9 AV:L/AC:M/Au:N/C:C/I:C/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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2137.html CVE-2012-2137 https://bugzilla.redhat.com/show_bug.cgi?id=816151 bz#816151: CVE-2012-2137 kernel: kvm: buffer overflow in kvm_set_irq() A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. 2012-05-18T00:00:00Z 2012-06-05T00:00:00Z CVE-2012-2372 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2372.html CVE-2012-2372 https://bugzilla.redhat.com/show_bug.cgi?id=822754 bz#822754: CVE-2012-2372 kernel: rds-ping cause kernel panic A race condition was found in the Linux kernel's memory management subsystem in the way pmd_populate() and pte_offset_map_lock() interacted on 32-bit x86 systems with more than 4GB of RAM. A local, unprivileged user could use this flaw to cause a denial of service. 2012-05-11T00:00:00Z 2012-05-17T00:00:00Z CVE-2012-2373 6Client-6.2.z:kernel-2.6.32-220.23.1.el6 6Client-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-6.2.z:kernel-2.6.32-220.23.1.el6 6ComputeNode-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-6.2.z:kernel-2.6.32-220.23.1.el6 6Server-optional-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-6.2.z:kernel-2.6.32-220.23.1.el6 6Workstation-optional-6.2.z:kernel-2.6.32-220.23.1.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-2012-0743.html https://www.redhat.com/security/data/cve/CVE-2012-2373.html CVE-2012-2373 https://bugzilla.redhat.com/show_bug.cgi?id=822821 bz#822821: CVE-2012-2373 kernel: mm: read_pmd_atomic: 32bit PAE pmd walk vs pmd_populate SMP race condition