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[RHSA-2015:2636-01] Important: kernel security and bug fix update

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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

 

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/

 

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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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--

 

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