ID

VAR-201511-0294

CVE

CVE-2015-5307

TITLE

Linux Kernel of KVM Subsystem and Xen Service disruption in (DoS) Vulnerabilities

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 #AC (aka Alignment Check) exceptions, related to svm.c and vmx.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. 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. (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. Content-Disposition: inline ==========================================================================Ubuntu Security Notice USN-2801-1 November 10, 2015 linux vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: The system could be made to crash under certain conditions. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.13.0-68-generic 3.13.0-68.111 linux-image-3.13.0-68-generic-lpae 3.13.0-68.111 linux-image-3.13.0-68-lowlatency 3.13.0-68.111 linux-image-3.13.0-68-powerpc-e500 3.13.0-68.111 linux-image-3.13.0-68-powerpc-e500mc 3.13.0-68.111 linux-image-3.13.0-68-powerpc-smp 3.13.0-68.111 linux-image-3.13.0-68-powerpc64-emb 3.13.0-68.111 linux-image-3.13.0-68-powerpc64-smp 3.13.0-68.111 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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security, bug fix, and enhancement update Advisory ID: RHSA-2015:2587-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2587.html Issue date: 2015-12-09 CVE Names: CVE-2015-2925 CVE-2015-5307 CVE-2015-7613 ===================================================================== 1. Summary: Updated kernel packages that fix three security issues, several bugs, and one enhancement are now available for Red Hat Enterprise Linux 7.1 Extended Update Support. 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 ComputeNode EUS (v. 7.1) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.1) - noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.1) - ppc64, s390x, x86_64 3. * A flaw was found in the way the Linux kernel's file system implementation handled rename operations in which the source was inside and the destination was outside of a bind mount. A privileged user inside a container could use this flaw to escape the bind mount and, potentially, escalate their privileges on the system. (CVE-2015-2925, Important) * 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) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel. (CVE-2015-5307, Important) * A race condition flaw was found in the way the Linux kernel's IPC subsystem initialized certain fields in an IPC object structure that were later used for permission checking before inserting the object into a globally visible list. A local, unprivileged user could potentially use this flaw to elevate their privileges on the system. (CVE-2015-7613, 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 and adds one enhancement: * When setting up an ESP IPsec connection, the aes_ctr algorithm did not work for ESP on a Power little endian VM host. As a consequence, a kernel error was previously returned and the connection failed to be established. A set of patches has been provided to fix this bug, and aes_ctr works for ESP in the described situation as expected. (BZ#1247127) * The redistribute3() function distributed entries across 3 nodes. However, some entries were moved an incorrect way, breaking the ordering. As a result, BUG() in the dm-btree-remove.c:shift() function occurred when entries were removed from the btree. A patch has been provided to fix this bug, and redistribute3() now works as expected. (BZ#1263945) * When booting an mpt2sas adapter in a huge DDW enabled slot on Power, the kernel previously generated a warning followed by a call trace. The provided patch set enhances the Power kernel to be able to support IOMMU as a fallback for the cases where the coherent mask of the device is not suitable for direct DMA. As a result, neither the warning nor the call trace occur in this scenario. (BZ#1267133) * If the client mounted /exports and tried to execute the "chown -R" command across the entire mountpoint, a warning about a circular directory structure was previously returned because mount points all had the same inode number. A set of patches has been provided to fix this bug, and mount points are now assigned with unique inode numbers as expected. (BZ#1273239) * Due to a validation error of in-kernel 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#1275149) * The NFS client could previously fail to send a CLOSE operation if the file was opened with O_WRONLY and the server restarted after the OPEN. Consequently, the server appeared in a state that could block other NFS operations from completing. The client's state flags have been modified to catch this condition and correctly CLOSE the file. (BZ#1275298) * This update sets multicast filters for multicast packets when the interface is not in promiscuous mode. This change has an impact on the RAR usage such that SR-IOV has some RARs reserved for its own usage as well. (BZ#1265091) All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add this enhancement. 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/): 1209367 - CVE-2015-2925 Kernel: vfs: Do not allow escaping from bind mounts 1268270 - CVE-2015-7613 kernel: Unauthorized access to IPC objects with SysV shm 1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception 6. Package List: Red Hat Enterprise Linux ComputeNode EUS (v. 7.1): Source: kernel-3.10.0-229.24.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-229.24.2.el7.noarch.rpm kernel-doc-3.10.0-229.24.2.el7.noarch.rpm x86_64: kernel-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-229.24.2.el7.x86_64.rpm kernel-devel-3.10.0-229.24.2.el7.x86_64.rpm kernel-headers-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-229.24.2.el7.x86_64.rpm perf-3.10.0-229.24.2.el7.x86_64.rpm perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1): x86_64: kernel-debug-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-229.24.2.el7.x86_64.rpm perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm python-perf-3.10.0-229.24.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.1): Source: kernel-3.10.0-229.24.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-229.24.2.el7.noarch.rpm kernel-doc-3.10.0-229.24.2.el7.noarch.rpm ppc64: kernel-3.10.0-229.24.2.el7.ppc64.rpm kernel-bootwrapper-3.10.0-229.24.2.el7.ppc64.rpm kernel-debug-3.10.0-229.24.2.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-debug-devel-3.10.0-229.24.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-229.24.2.el7.ppc64.rpm kernel-devel-3.10.0-229.24.2.el7.ppc64.rpm kernel-headers-3.10.0-229.24.2.el7.ppc64.rpm kernel-tools-3.10.0-229.24.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-tools-libs-3.10.0-229.24.2.el7.ppc64.rpm perf-3.10.0-229.24.2.el7.ppc64.rpm perf-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm s390x: kernel-3.10.0-229.24.2.el7.s390x.rpm kernel-debug-3.10.0-229.24.2.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-229.24.2.el7.s390x.rpm kernel-debug-devel-3.10.0-229.24.2.el7.s390x.rpm kernel-debuginfo-3.10.0-229.24.2.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-229.24.2.el7.s390x.rpm kernel-devel-3.10.0-229.24.2.el7.s390x.rpm kernel-headers-3.10.0-229.24.2.el7.s390x.rpm kernel-kdump-3.10.0-229.24.2.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-229.24.2.el7.s390x.rpm kernel-kdump-devel-3.10.0-229.24.2.el7.s390x.rpm perf-3.10.0-229.24.2.el7.s390x.rpm perf-debuginfo-3.10.0-229.24.2.el7.s390x.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.s390x.rpm x86_64: kernel-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-229.24.2.el7.x86_64.rpm kernel-devel-3.10.0-229.24.2.el7.x86_64.rpm kernel-headers-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-229.24.2.el7.x86_64.rpm perf-3.10.0-229.24.2.el7.x86_64.rpm perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.1): ppc64: kernel-debug-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-229.24.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-229.24.2.el7.ppc64.rpm perf-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm python-perf-3.10.0-229.24.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.ppc64.rpm s390x: kernel-debug-debuginfo-3.10.0-229.24.2.el7.s390x.rpm kernel-debuginfo-3.10.0-229.24.2.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-229.24.2.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-229.24.2.el7.s390x.rpm perf-debuginfo-3.10.0-229.24.2.el7.s390x.rpm python-perf-3.10.0-229.24.2.el7.s390x.rpm python-perf-debuginfo-3.10.0-229.24.2.el7.s390x.rpm x86_64: kernel-debug-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-229.24.2.el7.x86_64.rpm perf-debuginfo-3.10.0-229.24.2.el7.x86_64.rpm python-perf-3.10.0-229.24.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-229.24.2.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-2015-2925 https://access.redhat.com/security/cve/CVE-2015-5307 https://access.redhat.com/security/cve/CVE-2015-7613 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 iD8DBQFWaAiYXlSAg2UNWIIRAjb5AJ0THm670EXOpN5VXBXR0ZoN8xBr7ACePLVK BJGtx2g8OK60Hii9aeZCS3w= =GEL4 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 6.2) - x86_64 3. This leads to a panic of the host kernel. CVE-2015-7833 Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a flaw in the processing of certain USB device descriptors in the usbvision driver. An attacker with physical access to the system can use this flaw to crash the system. CVE-2015-7872 Dmitry Vyukov discovered a vulnerability in the keyrings garbage collector allowing a local user to trigger a kernel panic. CVE-2015-7990 It was discovered that the fix for CVE-2015-6937 was incomplete. A race condition when sending a message on unbound socket can still cause a NULL pointer dereference. A remote attacker might be able to cause a denial of service (crash) by sending a crafted packet. For the oldstable distribution (wheezy), these problems have been fixed in version 3.2.68-1+deb7u6. For the stable distribution (jessie), these problems have been fixed in version 3.16.7-ckt11-1+deb8u6

AFFECTED PRODUCTS