Ubuntu Security Notice 3054-1 - Ben Hawkes discovered an integer overflow in the Linux netfilter implementation. On systems running 32 bit kernels, a local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code with administrative privileges. It was discovered that the keyring implementation in the Linux kernel did not ensure a data structure was initialized before referencing it after an error condition occurred. A local attacker could use this to cause a deni al of service. Various other issues were also addressed.
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Ubuntu Security Notice USN-3054-1
August 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:
Ben Hawkes discovered an integer overflow in the Linux netfilter
implementation. On systems running 32 bit kernels, a local unprivileged
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code with administrative privileges.
(CVE-2016-3135)
It was discovered that the keyring implementation in the Linux kernel did
not ensure a data structure was initialized before referencing it after a
n
error condition occurred. A local attacker could use this to cause a deni
al
of service (system crash). (CVE-2016-4470)
Sasha Levin discovered that a use-after-free existed in the percpu
allocator in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2016-4794)
Kangjie Lu discovered an information leak in the netlink implementation o
f
the Linux kernel. A local attacker could use this to obtain sensitive
information from kernel memory. (CVE-2016-5243)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 LTS:
linux-image-4.4.0-34-generic 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-generic-lpae 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-lowlatency 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-powerpc-e500mc 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-powerpc-smp 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-powerpc64-emb 4.4.0-34.53~14.04.1
linux-image-4.4.0-34-powerpc64-smp 4.4.0-34.53~14.04.1
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-3054-1
CVE-2016-3135, CVE-2016-4470, CVE-2016-4794, CVE-2016-5243
Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-34.53~14.04
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