ID

VAR-201511-0101

CVE

CVE-2015-8104

TITLE

Linux Kernel CVE-2015-8104 Denial of Service Vulnerability

DESCRIPTION

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c. Linux Kernel is prone to a denial-of-service vulnerability. An attacker with a guest account can exploit this issue to cause an infinite loop in the host, denying service to legitimate users. 6.6) - i386, ppc64, s390x, x86_64 3. This update also fixes the following bugs: * When doing TSO/GSO in the presence of VLAN headers on a macvtap device, the header offsets were incorrectly calculated. As a consequence, when 2 guests on the same host communicated over a guest configured VLAN, performance dropped to about 1 Mbps. A set of patches has been provided to fix this bug, and network performance with VLAN tags now works with optimal performance. (BZ#1215914) * Prior to this update, TSO acceleration features have been removed from the VLAN device which caused that VLAN performance on top of a virtio device was much lower than that of a virtio device itself. This update re-enables TSO acceleration features, and performance of VLAN devices on top of a virtio device has thus been restored. (BZ#1240988) * With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor Advertisement (UNA) was previously sent using the link global IPv6 address as source address. The underlying source code has been patched, and, after the failover in bonding, UNA is sent using both the corresponding link IPv6 address and global IPv6 address of bond0 and bond0.vlan. (BZ#1258480) * Previously, Human Interface Device (HID) would run a report on an unaligned buffer, which could cause a page fault interrupt and an oops when the end of the report was read. This update fixes this bug by padding the end of the report with extra bytes, so the reading of the report never crosses a page boundary. As a result, a page fault and subsequent oops no longer occur. (BZ#1268202) * Inside hugetlb, region data structures were protected by a combination of a memory map semaphore and a single hugetlb instance mutex. However, a page-fault scalability improvement backported to the kernel on previous releases removed the single hugetlb instance mutex and introduced a new mutex table, making the locking combination insufficient, leading to possible race windows that could cause corruption and undefined behavior. The problem could be seen for example with software mapping or re-mapping hugetlb areas with concurrent threads reading/writing to same areas causing page faults. This update fixes the problem by introducing now a required spinlock to the region tracking functions for proper serialization. The problem only affects software using huge pages through hugetlb interface. (BZ#1274597) * Previously, VLAN stacked on the macvlan or macvtap device did not work for devices that implement and use VLAN filters. As a consequence, macvtap passthrough mode failed to transfer VLAN packets over the be2net driver. This update implements VLAN ndo calls to the macvlan driver to pass appropriate VLAN tag IDs to lower devices. As a result, macvtap transfers VLAN packets over be2net successfully. For the oldstable distribution (wheezy), an update will be provided later. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2015:2552-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2552.html Issue date: 2015-12-08 CVE Names: CVE-2015-5307 CVE-2015-8104 ===================================================================== 1. Summary: Updated kernel packages that fix two security issues, several bugs, and add one enhancement are now available for Red Hat Enterprise Linux 7. Red Hat Product Security 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. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. * It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) and #DB (debug exception) is handled. A privileged user inside a guest could use these flaws to create denial of service conditions on the host kernel. (CVE-2015-5307, CVE-2015-8104, Important) Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the CVE-2015-5307 issue. This update also fixes the following bugs: * On Intel Xeon v5 platforms, the processor frequency was always tied to the highest possible frequency. Switching p-states on these client platforms failed. This update sets the idle frequency, busy frequency, and processor frequency values by determining the range and adjusting the minimal and maximal percent limit values. Now, switching p-states on the aforementioned client platforms proceeds successfully. (BZ#1273926) * Due to a validation error of in-kernel memory-mapped I/O (MMIO) tracing, a VM became previously unresponsive when connected to Red Hat Enterprise Virtualization Hypervisor. The provided patch fixes this bug by dropping the check in MMIO handler, and a VM continues running as expected. (BZ#1275150) * Due to retry-able command errors, the NVMe driver previously leaked I/O descriptors and DMA mappings. As a consequence, the kernel could become unresponsive during the hot-unplug operation if a driver was removed. This update fixes the driver memory leak bug on command retries, and the kernel no longer hangs in this situation. (BZ#1279792) * The hybrid_dma_data() function was not initialized before use, which caused an invalid memory access when hot-plugging a PCI card. As a consequence, a kernel oops occurred. The provided patch makes sure hybrid_dma_data() is initialized before use, and the kernel oops no longer occurs in this situation. (BZ#1279793) * When running PowerPC (PPC) KVM guests and the host was experiencing a lot of page faults, for example because it was running low on memory, the host sometimes triggered an incorrect kind of interrupt in the guest: a data storage exception instead of a data segment exception. This caused a kernel panic of the PPC KVM guest. With this update, the host kernel synthesizes a segment fault if the corresponding Segment Lookaside Buffer (SLB) lookup fails, which prevents the kernel panic from occurring. (BZ#1281423) * The kernel accessed an incorrect area of the khugepaged process causing Logical Partitioning (LPAR) to become unresponsive, and an oops occurred in medlp5. The backported upstream patch prevents an LPAR hang, and the oops no longer occurs. (BZ#1281424) * When the sctp module was loaded and a route to an association endpoint was removed after receiving an Out-of-The-Blue (OOTB) chunk but before incrementing the "dropped because of missing route" SNMP statistic, a Null Pointer Dereference kernel panic previously occurred. This update fixes the race condition between OOTB response and route removal. (BZ#1281426) * The cpuscaling test of the certification test suite previously failed due to a rounding bug in the intel-pstate driver. This bug has been fixed and the cpuscaling test now passes. (BZ#1281491) All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. 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. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception 1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: kernel-3.10.0-327.3.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: kernel-3.10.0-327.3.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: kernel-3.10.0-327.3.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm ppc64: kernel-3.10.0-327.3.1.el7.ppc64.rpm kernel-bootwrapper-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.3.1.el7.ppc64.rpm kernel-devel-3.10.0-327.3.1.el7.ppc64.rpm kernel-headers-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.ppc64.rpm perf-3.10.0-327.3.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm python-perf-3.10.0-327.3.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm ppc64le: kernel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.3.1.el7.ppc64le.rpm kernel-devel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-headers-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-libs-3.10.0-327.3.1.el7.ppc64le.rpm perf-3.10.0-327.3.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm s390x: kernel-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-devel-3.10.0-327.3.1.el7.s390x.rpm kernel-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-327.3.1.el7.s390x.rpm kernel-devel-3.10.0-327.3.1.el7.s390x.rpm kernel-headers-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-devel-3.10.0-327.3.1.el7.s390x.rpm perf-3.10.0-327.3.1.el7.s390x.rpm perf-debuginfo-3.10.0-327.3.1.el7.s390x.rpm python-perf-3.10.0-327.3.1.el7.s390x.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.s390x.rpm x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-devel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: kernel-3.10.0-327.3.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.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/ 7. References: https://access.redhat.com/security/cve/CVE-2015-5307 https://access.redhat.com/security/cve/CVE-2015-8104 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2015 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFWZubYXlSAg2UNWIIRAsvDAJ46kkXWcTnnN5EtbqyO0fc2+uZZawCeNnnr 2T4VNHyutcGOZycd46ObXOk= =v6PE -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . Upstream support for the 4.1 release series has ended and since no information is available which would allow backports of isolated security fixes, security support for virtualbox in wheezy/oldstable needed to be ended as well. If you use virtualbox with externally procured VMs (e.g. through vagrant) we advise you to update to Debian jessie. For the stable distribution (jessie), these problems have been fixed in version 4.3.36-dfsg-1+deb8u1. For the testing distribution (stretch), these problems have been fixed in version 5.0.14-dfsg-1. For the unstable distribution (sid), these problems have been fixed in version 5.0.14-dfsg-1. We recommend that you upgrade your virtualbox packages. Content-Disposition: inline ============================================================================ Ubuntu Security Notice USN-2842-1 December 17, 2015 linux vulnerabilities ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.04 Summary: Several security issues were fixed in the kernel. (CVE-2015-8104) =E9=83=AD=E6=B0=B8=E5=88=9A discovered that the ppp implementation in the Linux kernel did not ensure that certain slot numbers are valid. A local attacker with the privilege to call ioctl() on /dev/ppp could cause a denial of service (system crash). (CVE-2015-7799) It was discovered that the virtual video osd test driver in the Linux kernel did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7884) It was discovered that the driver for Digi Neo and ClassicBoard devices did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7885) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.04: linux-image-3.19.0-41-generic 3.19.0-41.46 linux-image-3.19.0-41-generic-lpae 3.19.0-41.46 linux-image-3.19.0-41-lowlatency 3.19.0-41.46 linux-image-3.19.0-41-powerpc-e500mc 3.19.0-41.46 linux-image-3.19.0-41-powerpc-smp 3.19.0-41.46 linux-image-3.19.0-41-powerpc64-emb 3.19.0-41.46 linux-image-3.19.0-41-powerpc64-smp 3.19.0-41.46 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well

AFFECTED PRODUCTS