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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
=====================================================================

1. 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.

2. 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

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

* 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)

* 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)

* 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)

* 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)

* 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)

* 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.

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
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

6. 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

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Red Hat Enterprise Linux Server (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

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

Red Hat Enterprise Linux Server Optional (v. 6):

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

Red Hat Enterprise Linux Workstation (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

Red Hat Enterprise Linux Workstation Optional (v. 6):

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/cve/CVE-2015-7872
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/

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