VAR-201511-0294
Vulnerability from variot - Updated: 2025-12-21 20:45The 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:
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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)
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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)
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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. 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. (BZ#1274597)
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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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2015:2636-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2636.html Issue date: 2015-12-15 CVE Names: CVE-2015-2925 CVE-2015-5307 CVE-2015-7613 CVE-2015-7872 CVE-2015-8104 =====================================================================
- Summary:
Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.
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.
- Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
-
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) 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)
-
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)
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It was found that the Linux kernel's keys subsystem did not correctly garbage collect uninstantiated keyrings. A local attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2015-7872, 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:
-
Previously, Human Interface Device (HID) ran 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#1268203)
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The NFS client was previously failing to detect a directory loop for some NFS server directory structures. This failure could cause NFS inodes to remain referenced after attempting to unmount the file system, leading to a kernel crash. Loop checks have been added to VFS, which effectively prevents this problem from occurring. (BZ#1272858)
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Due to a race whereby the nfs_wb_pages_cancel() and nfs_commit_release_pages() calls both removed a request from the nfs_inode struct type, the kernel panicked with negative nfs_inode.npages count. The provided upstream patch performs the required serialization by holding the inode i_lock over the check of PagePrivate and locking the request, thus preventing the race and kernel panic from occurring. (BZ#1273721)
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Due to incorrect URB_ISO_ASAP semantics, playing an audio file using a USB sound card could previously fail for some hardware configurations. This update fixes the bug, and playing audio from a USB sound card now works as expected. (BZ#1273916)
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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. This update fixes the problem by introducing a required spinlock to the region tracking functions for proper serialization. The problem only affects software using huge pages through hugetlb interface. (BZ#1274599)
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.
- 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
- 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 1272371 - CVE-2015-7872 kernel: Keyrings crash triggerable by unprivileged user 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
- Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source: kernel-2.6.32-573.12.1.el6.src.rpm
i386: kernel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-devel-2.6.32-573.12.1.el6.i686.rpm kernel-headers-2.6.32-573.12.1.el6.i686.rpm perf-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-573.12.1.el6.noarch.rpm kernel-doc-2.6.32-573.12.1.el6.noarch.rpm kernel-firmware-2.6.32-573.12.1.el6.noarch.rpm
x86_64: kernel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm kernel-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-headers-2.6.32-573.12.1.el6.x86_64.rpm perf-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
x86_64: kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: kernel-2.6.32-573.12.1.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-573.12.1.el6.noarch.rpm kernel-doc-2.6.32-573.12.1.el6.noarch.rpm kernel-firmware-2.6.32-573.12.1.el6.noarch.rpm
x86_64: kernel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm kernel-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-headers-2.6.32-573.12.1.el6.x86_64.rpm perf-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: kernel-2.6.32-573.12.1.el6.src.rpm
i386: kernel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-devel-2.6.32-573.12.1.el6.i686.rpm kernel-headers-2.6.32-573.12.1.el6.i686.rpm perf-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-573.12.1.el6.noarch.rpm kernel-doc-2.6.32-573.12.1.el6.noarch.rpm kernel-firmware-2.6.32-573.12.1.el6.noarch.rpm
ppc64: kernel-2.6.32-573.12.1.el6.ppc64.rpm kernel-bootwrapper-2.6.32-573.12.1.el6.ppc64.rpm kernel-debug-2.6.32-573.12.1.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm kernel-debug-devel-2.6.32-573.12.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-573.12.1.el6.ppc64.rpm kernel-devel-2.6.32-573.12.1.el6.ppc64.rpm kernel-headers-2.6.32-573.12.1.el6.ppc64.rpm perf-2.6.32-573.12.1.el6.ppc64.rpm perf-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm
s390x: kernel-2.6.32-573.12.1.el6.s390x.rpm kernel-debug-2.6.32-573.12.1.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.s390x.rpm kernel-debug-devel-2.6.32-573.12.1.el6.s390x.rpm kernel-debuginfo-2.6.32-573.12.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-573.12.1.el6.s390x.rpm kernel-devel-2.6.32-573.12.1.el6.s390x.rpm kernel-headers-2.6.32-573.12.1.el6.s390x.rpm kernel-kdump-2.6.32-573.12.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-573.12.1.el6.s390x.rpm kernel-kdump-devel-2.6.32-573.12.1.el6.s390x.rpm perf-2.6.32-573.12.1.el6.s390x.rpm perf-debuginfo-2.6.32-573.12.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.s390x.rpm
x86_64: kernel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm kernel-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-headers-2.6.32-573.12.1.el6.x86_64.rpm perf-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
ppc64: kernel-debug-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-573.12.1.el6.ppc64.rpm perf-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm python-perf-2.6.32-573.12.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.ppc64.rpm
s390x: kernel-debug-debuginfo-2.6.32-573.12.1.el6.s390x.rpm kernel-debuginfo-2.6.32-573.12.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-573.12.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-573.12.1.el6.s390x.rpm perf-debuginfo-2.6.32-573.12.1.el6.s390x.rpm python-perf-2.6.32-573.12.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.s390x.rpm
x86_64: kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source: kernel-2.6.32-573.12.1.el6.src.rpm
i386: kernel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-devel-2.6.32-573.12.1.el6.i686.rpm kernel-headers-2.6.32-573.12.1.el6.i686.rpm perf-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-573.12.1.el6.noarch.rpm kernel-doc-2.6.32-573.12.1.el6.noarch.rpm kernel-firmware-2.6.32-573.12.1.el6.noarch.rpm
x86_64: kernel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm kernel-devel-2.6.32-573.12.1.el6.x86_64.rpm kernel-headers-2.6.32-573.12.1.el6.x86_64.rpm perf-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm python-perf-2.6.32-573.12.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm
x86_64: kernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm python-perf-2.6.32-573.12.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.12.1.el6.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/
- 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/cve/CVE-2015-7872 https://access.redhat.com/security/cve/CVE-2015-8104 https://access.redhat.com/security/updates/classification/#important
- 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
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 6.2) - x86_64
- 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.
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. Content-Disposition: inline
==========================================================================Ubuntu Security Notice USN-2800-1 November 10, 2015
linux vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 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 12.04 LTS: linux-image-3.2.0-94-generic 3.2.0-94.134 linux-image-3.2.0-94-generic-pae 3.2.0-94.134 linux-image-3.2.0-94-highbank 3.2.0-94.134 linux-image-3.2.0-94-omap 3.2.0-94.134 linux-image-3.2.0-94-powerpc-smp 3.2.0-94.134 linux-image-3.2.0-94-powerpc64-smp 3.2.0-94.134 linux-image-3.2.0-94-virtual 3.2.0-94.134
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
Show details on source website{
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"data": "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. \nAn attacker with a guest account can exploit this issue to cause an infinite loop in the host, denying service to legitimate users. \n\nThis update also fixes the following bugs:\n\n* When doing TSO/GSO in the presence of VLAN headers on a macvtap device,\nthe header offsets were incorrectly calculated. As a consequence, when 2\nguests on the same host communicated over a guest configured VLAN,\nperformance dropped to about 1 Mbps. A set of patches has been provided to\nfix this bug, and network performance with VLAN tags now works with optimal\nperformance. (BZ#1215914)\n\n* Prior to this update, TSO acceleration features have been removed from\nthe VLAN device which caused that VLAN performance on top of a virtio\ndevice was much lower than that of a virtio device itself. This update\nre-enables TSO acceleration features, and performance of VLAN devices on\ntop of a virtio device has thus been restored. (BZ#1240988)\n\n* With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor\nAdvertisement (UNA) was previously sent using the link global IPv6 address\nas source address. The underlying source code has been patched, and, after\nthe failover in bonding, UNA is sent using both the corresponding link IPv6\naddress and global IPv6 address of bond0 and bond0.vlan. \nThe problem could be seen for example with software mapping or re-mapping\nhugetlb areas with concurrent threads reading/writing to same areas causing\npage faults. \n(BZ#1274597)\n\n* Previously, VLAN stacked on the macvlan or macvtap device did not work\nfor devices that implement and use VLAN filters. As a consequence, macvtap\npassthrough mode failed to transfer VLAN packets over the be2net driver. \nThis update implements VLAN ndo calls to the macvlan driver to pass\nappropriate VLAN tag IDs to lower devices. As a result, macvtap transfers\nVLAN packets over be2net successfully. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=====================================================================\n Red Hat Security Advisory\n\nSynopsis: Important: kernel security and bug fix update\nAdvisory ID: RHSA-2015:2636-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://rhn.redhat.com/errata/RHSA-2015-2636.html\nIssue date: 2015-12-15\nCVE Names: CVE-2015-2925 CVE-2015-5307 CVE-2015-7613 \n CVE-2015-7872 CVE-2015-8104 \n=====================================================================\n\n1. Summary:\n\nUpdated kernel packages that fix multiple security issues and several bugs\nare now available for Red Hat Enterprise Linux 6. \n\nRed Hat Product Security has rated this update as having Important security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64\nRed Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64\nRed Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64\nRed Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64\n\n3. \n\n* A flaw was found in the way the Linux kernel\u0027s file system implementation\nhandled rename operations in which the source was inside and the\ndestination was outside of a bind mount. A privileged user inside a\ncontainer could use this flaw to escape the bind mount and, potentially,\nescalate their privileges on the system. (CVE-2015-2925, Important)\n\n* It was found that the x86 ISA (Instruction Set Architecture) is prone to\na denial of service attack inside a virtualized environment in the form of\nan infinite loop in the microcode due to the way (sequential) delivering of\nbenign exceptions such as #AC (alignment check exception) and #DB (debug\nexception) is handled. A privileged user inside a guest could use these\nflaws to create denial of service conditions on the host kernel. \n(CVE-2015-5307, CVE-2015-8104, Important)\n\n* A race condition flaw was found in the way the Linux kernel\u0027s IPC\nsubsystem initialized certain fields in an IPC object structure that were\nlater used for permission checking before inserting the object into a\nglobally visible list. A local, unprivileged user could potentially use\nthis flaw to elevate their privileges on the system. (CVE-2015-7613,\nImportant)\n\n* It was found that the Linux kernel\u0027s keys subsystem did not correctly\ngarbage collect uninstantiated keyrings. A local attacker could use this\nflaw to crash the system or, potentially, escalate their privileges on\nthe system. (CVE-2015-7872, Important)\n\nRed Hat would like to thank Ben Serebrin of Google Inc. for reporting the\nCVE-2015-5307 issue. \n\nThis update also fixes the following bugs:\n\n* Previously, Human Interface Device (HID) ran a report on an unaligned\nbuffer, which could cause a page fault interrupt and an oops when the end\nof the report was read. This update fixes this bug by padding the end of\nthe report with extra bytes, so the reading of the report never crosses a\npage boundary. As a result, a page fault and subsequent oops no longer\noccur. (BZ#1268203)\n\n* The NFS client was previously failing to detect a directory loop for some\nNFS server directory structures. This failure could cause NFS inodes to\nremain referenced after attempting to unmount the file system, leading to a\nkernel crash. Loop checks have been added to VFS, which effectively\nprevents this problem from occurring. (BZ#1272858)\n\n* Due to a race whereby the nfs_wb_pages_cancel() and\nnfs_commit_release_pages() calls both removed a request from the nfs_inode\nstruct type, the kernel panicked with negative nfs_inode.npages count. \nThe provided upstream patch performs the required serialization by holding\nthe inode i_lock over the check of PagePrivate and locking the request,\nthus preventing the race and kernel panic from occurring. (BZ#1273721)\n\n* Due to incorrect URB_ISO_ASAP semantics, playing an audio file using a\nUSB sound card could previously fail for some hardware configurations. \nThis update fixes the bug, and playing audio from a USB sound card now\nworks as expected. (BZ#1273916)\n\n* Inside hugetlb, region data structures were protected by a combination of\na memory map semaphore and a single hugetlb instance mutex. However, a\npage-fault scalability improvement backported to the kernel on previous\nreleases removed the single hugetlb instance mutex and introduced a new\nmutex table, making the locking combination insufficient, leading to\npossible race windows that could cause corruption and undefined behavior. \nThis update fixes the problem by introducing a required spinlock to the\nregion tracking functions for proper serialization. The problem only\naffects software using huge pages through hugetlb interface. (BZ#1274599)\n\nAll kernel users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. The system must be\nrebooted for this update to take effect. \n\n4. Solution:\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. \n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1209367 - CVE-2015-2925 Kernel: vfs: Do not allow escaping from bind mounts\n1268270 - CVE-2015-7613 kernel: Unauthorized access to IPC objects with SysV shm\n1272371 - CVE-2015-7872 kernel: Keyrings crash triggerable by unprivileged user\n1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception\n1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception\n\n6. 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6):\n\nSource:\nkernel-2.6.32-573.12.1.el6.src.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-573.12.1.el6.noarch.rpm\nkernel-doc-2.6.32-573.12.1.el6.noarch.rpm\nkernel-firmware-2.6.32-573.12.1.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debug-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-573.12.1.el6.i686.rpm\nkernel-debug-devel-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm\nkernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-devel-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-headers-2.6.32-573.12.1.el6.x86_64.rpm\nperf-2.6.32-573.12.1.el6.x86_64.rpm\nperf-debuginfo-2.6.32-573.12.1.el6.i686.rpm\nperf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm\npython-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\n\nRed 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Hat Enterprise Linux Workstation Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-573.12.1.el6.i686.rpm\nkernel-debuginfo-2.6.32-573.12.1.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-573.12.1.el6.i686.rpm\nperf-debuginfo-2.6.32-573.12.1.el6.i686.rpm\npython-perf-2.6.32-573.12.1.el6.i686.rpm\npython-perf-debuginfo-2.6.32-573.12.1.el6.i686.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-573.12.1.el6.x86_64.rpm\nperf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\npython-perf-2.6.32-573.12.1.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-573.12.1.el6.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2015-2925\nhttps://access.redhat.com/security/cve/CVE-2015-5307\nhttps://access.redhat.com/security/cve/CVE-2015-7613\nhttps://access.redhat.com/security/cve/CVE-2015-7872\nhttps://access.redhat.com/security/cve/CVE-2015-8104\nhttps://access.redhat.com/security/updates/classification/#important\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2015 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niD8DBQFWcCufXlSAg2UNWIIRApkiAJ9XBPnSeORe1eAT52pJsfNVDlUeZQCgh8J+\nIfVNFw9sWvERIlqjgH4uc6I=\n=Grj7\n-----END PGP SIGNATURE-----\n\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. 6.2) - x86_64\n\n3. This leads to a panic of the\n host kernel. \n\nCVE-2015-7833\n\n Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a\n flaw in the processing of certain USB device descriptors in the\n usbvision driver. \n\nCVE-2015-7872\n\n Dmitry Vyukov discovered a vulnerability in the keyrings garbage\n collector allowing a local user to trigger a kernel panic. \n\nCVE-2015-7990\n\n It was discovered that the fix for CVE-2015-6937 was incomplete. A\n race condition when sending a message on unbound socket can still\n cause a NULL pointer dereference. A remote attacker might be able to\n cause a denial of service (crash) by sending a crafted packet. \n\nFor the oldstable distribution (wheezy), these problems have been fixed\nin version 3.2.68-1+deb7u6. \n\nFor the stable distribution (jessie), these problems have been fixed in\nversion 3.16.7-ckt11-1+deb8u6. Content-Disposition: inline\n\n==========================================================================Ubuntu Security Notice USN-2800-1\nNovember 10, 2015\n\nlinux vulnerability\n==========================================================================\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 12.04 LTS\n\nSummary:\n\nThe system could be made to crash under certain conditions. \n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 12.04 LTS:\n linux-image-3.2.0-94-generic 3.2.0-94.134\n linux-image-3.2.0-94-generic-pae 3.2.0-94.134\n linux-image-3.2.0-94-highbank 3.2.0-94.134\n linux-image-3.2.0-94-omap 3.2.0-94.134\n linux-image-3.2.0-94-powerpc-smp 3.2.0-94.134\n linux-image-3.2.0-94-powerpc64-smp 3.2.0-94.134\n linux-image-3.2.0-94-virtual 3.2.0-94.134\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. If\nyou use linux-restricted-modules, you have to update that package as\nwell to get modules which work with the new kernel version. Unless you\nmanually uninstalled the standard kernel metapackages (e.g. linux-generic,\nlinux-server, linux-powerpc), a standard system upgrade will automatically\nperform this as well",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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