Home / mailings [USN-3005-1] Linux kernel (Xenial HWE) vulnerabilities
Posted on 10 June 2016
Ubuntu Security==========================
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Ubuntu Security Notice USN-3005-1
June 10, 2016
linux-lts-xenial vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trus=
ty
Details:
Justin Yackoski discovered that the Atheros L2 Ethernet Driver in the Lin=
ux
kernel incorrectly enables scatter/gather I/O. A remote attacker could us=
e
this to obtain potentially sensitive information from kernel memory.
(CVE-2016-2117)
Jann Horn discovered that eCryptfs improperly attempted to use the mmap()=
handler of a lower filesystem that did not implement one, causing a
recursive page fault to occur. A local unprivileged attacker could use to=
cause a denial of service (system crash) or possibly execute arbitrary co=
de
with administrative privileges. (CVE-2016-1583)
Multiple race conditions where discovered in the Linux kernel's ext4 file=
system. A local user could exploit this flaw to cause a denial of service=
(disk corruption) by writing to a page that is associated with a differen=
t
users file after unsynchronized hole punching and page-fault handling.
(CVE-2015-8839)
Ralf Spenneberg discovered that the Linux kernel's GTCO digitizer USB
device driver did not properly validate endpoint descriptors. An attacker=
with physical access could use this to cause a denial of service (system
crash). (CVE-2016-2187)
Vitaly Kuznetsov discovered that the Linux kernel did not properly suppre=
ss
hugetlbfs support in X86 paravirtualized guests. An attacker in the guest=
OS could cause a denial of service (guest system crash). (CVE-2016-3961)
Kangjie Lu discovered an information leak in the ANSI/IEEE 802.2 LLC type=
2
Support implementations in the Linux kernel. A local attacker could use
this to obtain potentially sensitive information from kernel memory.
(CVE-2016-4485)
Kangjie Lu discovered an information leak in the routing netlink socket
interface (rtnetlink) implementation in the Linux kernel. A local attacke=
r
could use this to obtain potentially sensitive information from kernel
memory. (CVE-2016-4486)
Jann Horn discovered that the extended Berkeley Packet Filter (eBPF)
implementation in the Linux kernel could overflow reference counters on
systems with more than 32GB of physical ram and with RLIMIT_MEMLOCK set t=
o
infinite. A local unprivileged attacker could use to create a use-after-
free situation, causing a denial of service (system crash) or possibly ga=
in
administrative privileges. (CVE-2016-4558)
Jann Horn discovered that the InfiniBand interfaces within the Linux kern=
el
could be coerced into overwriting kernel memory. A local unprivileged
attacker could use this to possibly gain administrative privileges on
systems where InifiniBand related kernel modules are loaded.
(CVE-2016-4565)
It was discovered that in some situations the Linux kernel did not handle=
propagated mounts correctly. A local unprivileged attacker could use this=
to cause a denial of service (system crash). (CVE-2016-4581)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 LTS:
linux-image-4.4.0-24-generic 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-generic-lpae 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-lowlatency 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-powerpc-e500mc 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-powerpc-smp 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-powerpc64-emb 4.4.0-24.43~14.04.1
linux-image-4.4.0-24-powerpc64-smp 4.4.0-24.43~14.04.1
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-3005-1
CVE-2015-8839, CVE-2016-1583, CVE-2016-2117, CVE-2016-2187,
CVE-2016-3961, CVE-2016-4485, CVE-2016-4486, CVE-2016-4558,
CVE-2016-4565, CVE-2016-4581
Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-24.43~14.04=
=2E1
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