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AUSCERT External Security Bulletin Redistribution
ESB-2016.3055
Linux kernel vulnerabilities
21 December 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Console/Physical
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9555 CVE-2016-8645 CVE-2016-8633
CVE-2016-8630 CVE-2016-6213 CVE-2016-4568
CVE-2015-8964
Reference: ASB-2016.0103
ESB-2016.3019
ESB-2016.3005
ESB-2016.2941
ESB-2016.2918
Original Bulletin:
http://www.ubuntu.com/usn/usn-3161-1
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Ubuntu Security Notice USN-3161-1
December 20, 2016
linux vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description:
- - linux: Linux kernel
Details:
Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the
TTY implementation in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2015-8964)
It was discovered that the Video For Linux Two (v4l2) implementation in the
Linux kernel did not properly handle multiple planes when processing a
VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)
CAI Qian discovered that shared bind mounts in a mount namespace
exponentially added entries without restriction to the Linux kernel's mount
table. A local attacker could use this to cause a denial of service (system
crash). (CVE-2016-6213)
It was discovered that the KVM implementation for x86/x86_64 in the Linux
kernel could dereference a null pointer. An attacker in a guest virtual
machine could use this to cause a denial of service (system crash) in the
KVM host. (CVE-2016-8630)
Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation
in the Linux kernel contained a buffer overflow when handling fragmented
packets. A remote attacker could use this to possibly execute arbitrary
code with administrative privileges. (CVE-2016-8633)
Marco Grassi discovered that the TCP implementation in the Linux kernel
mishandles socket buffer (skb) truncation. A local attacker could use this
to cause a denial of service (system crash). (CVE-2016-8645)
Andrey Konovalov discovered that the SCTP implementation in the Linux
kernel improperly handled validation of incoming data. A remote attacker
could use this to cause a denial of service (system crash). (CVE-2016-9555)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.4.0-57-generic 4.4.0-57.78
linux-image-4.4.0-57-generic-lpae 4.4.0-57.78
linux-image-4.4.0-57-lowlatency 4.4.0-57.78
linux-image-4.4.0-57-powerpc-e500mc 4.4.0-57.78
linux-image-4.4.0-57-powerpc-smp 4.4.0-57.78
linux-image-4.4.0-57-powerpc64-emb 4.4.0-57.78
linux-image-4.4.0-57-powerpc64-smp 4.4.0-57.78
linux-image-generic 4.4.0.57.60
linux-image-generic-lpae 4.4.0.57.60
linux-image-lowlatency 4.4.0.57.60
linux-image-powerpc-e500mc 4.4.0.57.60
linux-image-powerpc-smp 4.4.0.57.60
linux-image-powerpc64-emb 4.4.0.57.60
linux-image-powerpc64-smp 4.4.0.57.60
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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
http://www.ubuntu.com/usn/usn-3161-1
CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630,
CVE-2016-8633, CVE-2016-8645, CVE-2016-9555
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78
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