[RHSA-2016:0103-01] Important: kernel security, bug fix, and enhancement update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Important: kernel security, bug fix, and enhancement update

Advisory ID: RHSA-2016:0103-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0103.html

Issue date: 2016-02-02

CVE Names: CVE-2015-8104 CVE-2016-0728 CVE-2016-0774

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1. Summary:

 

Updated kernel packages that fix three security issues, multiple 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, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.1) - ppc64, ppc64le, s390x, x86_64

 

3. Description:

 

The kernel packages contain the Linux kernel, the core of any Linux

operating system.

 

* 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 #DB (debug exception) is handled. A privileged

user inside a guest could use this flaw to create denial of service

conditions on the host kernel. (CVE-2015-8104, Important)

 

* A use-after-free flaw was found in the way the Linux kernel's key

management subsystem handled keyring object reference counting in certain

error path of the join_session_keyring() function. A local, unprivileged

user could use this flaw to escalate their privileges on the system.

(CVE-2016-0728, Important)

 

* It was found that the fix for CVE-2015-1805 incorrectly kept buffer

offset and buffer length in sync on a failed atomic read, potentially

resulting in a pipe buffer state corruption. A local, unprivileged user

could use this flaw to crash the system or leak kernel memory to user

space. (CVE-2016-0774, Moderate)

 

Red Hat would like to thank the Perception Point research team for

reporting the CVE-2016-0728 issue. The security impact of the CVE-2016-0774

issue was discovered by Red Hat.

 

Bug fixes:

 

* NMI watchdog of guests using legacy LVT0-based NMI delivery did not work

with APICv. Now, NMI works with LVT0 regardless of APICv. (BZ#1244726)

 

* Parallel file-extending direct I/O writes could previously race to update

the size of the file. If they executed out-of-order, the file size could

move backwards and push a previously completed write beyond the end of the

file, causing it to be lost. (BZ#1258942)

 

* The GHES NMI handler had a global spin lock that significantly increased

the latency of each perf sample collection. This update simplifies locking

inside the handler. (BZ#1280200)

 

* Sometimes, iptables rules are updated along with ip rules, and routes are

reloaded. Previously, skb->sk was mistakenly attached to some IPv6

forwarding traffic packets, which could cause kernel panic. Now, such

packets are checked and not processed. (BZ#1281700)

 

* The NUMA node was not reported for PCI adapters, which affected every

POWER system deployed with Red Hat Enterprise Linux 7 and caused

significant decrease in the system performance. (BZ#1283525)

 

* Processing packets with a lot of different IPv6 source addresses caused

the kernel to return warnings concerning soft-lockups due to high lock

contention and latency increase. (BZ#1285369)

 

* Running edge triggered interrupts with an ack notifier when

simultaneously reconfiguring the Intel I/O IOAPIC did not work correctly,

so EOI in the interrupt did not cause a VM to exit if APICv was enabled.

Consequently, the VM sometimes became unresponsive. (BZ#1287001)

 

* Block device readahead was artificially limited, so the read performance

was poor, especially on RAID devices. Now, per-device readahead limits are

used for each device, which has improved read performance. (BZ#1287548)

 

* Identical expectations could not be tracked simultaneously even if they

resided in different connection tracking zones. Now, an expectation insert

attempt is rejected only if the zone is also identical. (BZ#1290093)

 

* The storvsc kernel driver for Microsoft Hyper-V storage was setting

incorrect SRB flags, and Red Hat Enterprise Linux 7 guests running on

Microsoft Hyper-V were experiencing slow I/O as well as I/O failures when

they were connected to a virtual SAN. Now, SRB flags are set correctly.

(BZ#1290095)

 

* When a NUMA system with no memory in node 0 was used, the system

terminated unexpectedly during boot or when using OpenVSwitch. Now, the

kernel tries to allocate memory from other nodes when node 0 is not

present. (BZ#1300950)

 

Enhancement:

 

* IPsec has been updated to provide many fixes and some enhancements.

Of particular note is the ability to match on outgoing interfaces.

(BZ#1287407)

 

4. Solution:

 

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.

 

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/):

 

1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception

1297475 - CVE-2016-0728 kernel: Possible use-after-free vulnerability in keyring facility

1303961 - CVE-2016-0774 kernel: pipe buffer state corruption after unsuccessful atomic read from pipe

 

6. Package List:

 

Red Hat Enterprise Linux ComputeNode EUS (v. 7.1):

 

Source:

kernel-3.10.0-229.26.2.el7.src.rpm

 

noarch:

kernel-abi-whitelists-3.10.0-229.26.2.el7.noarch.rpm

kernel-doc-3.10.0-229.26.2.el7.noarch.rpm

 

x86_64:

kernel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-devel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-common-x86_64-3.10.0-229.26.2.el7.x86_64.rpm

kernel-devel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-headers-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-libs-3.10.0-229.26.2.el7.x86_64.rpm

perf-3.10.0-229.26.2.el7.x86_64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1):

 

x86_64:

kernel-debug-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-common-x86_64-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-libs-devel-3.10.0-229.26.2.el7.x86_64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server EUS (v. 7.1):

 

Source:

kernel-3.10.0-229.26.2.el7.src.rpm

 

noarch:

kernel-abi-whitelists-3.10.0-229.26.2.el7.noarch.rpm

kernel-doc-3.10.0-229.26.2.el7.noarch.rpm

 

ppc64:

kernel-3.10.0-229.26.2.el7.ppc64.rpm

kernel-bootwrapper-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debug-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debug-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debug-devel-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debuginfo-common-ppc64-3.10.0-229.26.2.el7.ppc64.rpm

kernel-devel-3.10.0-229.26.2.el7.ppc64.rpm

kernel-headers-3.10.0-229.26.2.el7.ppc64.rpm

kernel-tools-3.10.0-229.26.2.el7.ppc64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-tools-libs-3.10.0-229.26.2.el7.ppc64.rpm

perf-3.10.0-229.26.2.el7.ppc64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

 

s390x:

kernel-3.10.0-229.26.2.el7.s390x.rpm

kernel-debug-3.10.0-229.26.2.el7.s390x.rpm

kernel-debug-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

kernel-debug-devel-3.10.0-229.26.2.el7.s390x.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

kernel-debuginfo-common-s390x-3.10.0-229.26.2.el7.s390x.rpm

kernel-devel-3.10.0-229.26.2.el7.s390x.rpm

kernel-headers-3.10.0-229.26.2.el7.s390x.rpm

kernel-kdump-3.10.0-229.26.2.el7.s390x.rpm

kernel-kdump-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

kernel-kdump-devel-3.10.0-229.26.2.el7.s390x.rpm

perf-3.10.0-229.26.2.el7.s390x.rpm

perf-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

 

x86_64:

kernel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debug-devel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-common-x86_64-3.10.0-229.26.2.el7.x86_64.rpm

kernel-devel-3.10.0-229.26.2.el7.x86_64.rpm

kernel-headers-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-libs-3.10.0-229.26.2.el7.x86_64.rpm

perf-3.10.0-229.26.2.el7.x86_64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server EUS (v. 7.1):

 

Source:

kernel-3.10.0-229.26.2.ael7b.src.rpm

 

noarch:

kernel-abi-whitelists-3.10.0-229.26.2.ael7b.noarch.rpm

kernel-doc-3.10.0-229.26.2.ael7b.noarch.rpm

 

ppc64le:

kernel-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-bootwrapper-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debug-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debug-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debuginfo-common-ppc64le-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-devel-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-headers-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-tools-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-tools-libs-3.10.0-229.26.2.ael7b.ppc64le.rpm

perf-3.10.0-229.26.2.ael7b.ppc64le.rpm

perf-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

python-perf-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

 

Red Hat Enterprise Linux Server Optional EUS (v. 7.1):

 

ppc64:

kernel-debug-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-debuginfo-common-ppc64-3.10.0-229.26.2.el7.ppc64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

kernel-tools-libs-devel-3.10.0-229.26.2.el7.ppc64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

python-perf-3.10.0-229.26.2.el7.ppc64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.ppc64.rpm

 

s390x:

kernel-debug-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

kernel-debuginfo-common-s390x-3.10.0-229.26.2.el7.s390x.rpm

kernel-kdump-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

perf-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

python-perf-3.10.0-229.26.2.el7.s390x.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.s390x.rpm

 

x86_64:

kernel-debug-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-debuginfo-common-x86_64-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

kernel-tools-libs-devel-3.10.0-229.26.2.el7.x86_64.rpm

perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-3.10.0-229.26.2.el7.x86_64.rpm

python-perf-debuginfo-3.10.0-229.26.2.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional EUS (v. 7.1):

 

ppc64le:

kernel-debug-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debug-devel-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-debuginfo-common-ppc64le-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-tools-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

kernel-tools-libs-devel-3.10.0-229.26.2.ael7b.ppc64le.rpm

perf-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.rpm

python-perf-3.10.0-229.26.2.ael7b.ppc64le.rpm

python-perf-debuginfo-3.10.0-229.26.2.ael7b.ppc64le.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-2015-8104

https://access.redhat.com/security/cve/CVE-2016-0728

https://access.redhat.com/security/cve/CVE-2016-0774

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 2016 Red Hat, Inc.

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