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[RHSA-2015:2587-01] Important: kernel security, bug fix, and enhancement update

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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. 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) 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 . More contact

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

 

Copyright 2015 Red Hat, Inc.

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