USN-3054-1: Linux kernel (Xenial HWE) vulnerabilities

Releases

• Ubuntu 14.04 ESM

Packages

• linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

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 an
error condition occurred. A local attacker could use this to cause a denial
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 of
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

• 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

• CVE-2016-3135
• CVE-2016-4470
• CVE-2016-4794
• CVE-2016-5243

Related notices

• USN-3057-1: linux-snapdragon, linux-image-4.4.0-1022-snapdragon
• USN-2930-2: linux-image-4.2.0-34-generic-lpae, linux-image-4.2.0-34-powerpc-e500mc, linux-image-4.2.0-34-lowlatency, linux-image-4.2.0-34-powerpc64-smp, linux-image-4.2.0-34-powerpc64-emb, linux-image-extra-4.2.0-34-generic, linux-image-4.2.0-34-generic, linux-lts-wily, linux-image-4.2.0-34-powerpc-smp
• USN-3056-1: linux-raspi2, linux-image-4.4.0-1019-raspi2
• USN-3055-1: linux-image-4.4.0-34-powerpc64-smp, linux-image-4.4.0-34-generic-lpae, linux, linux-image-4.4.0-34-powerpc64-emb, linux-image-4.4.0-34-lowlatency, linux-image-4.4.0-34-powerpc-e500mc, linux-image-4.4.0-34-powerpc-smp, linux-image-extra-4.4.0-34-generic, linux-image-4.4.0-34-generic
• USN-2930-3: linux-raspi2, linux-image-4.2.0-1027-raspi2
• USN-2930-1: linux-image-4.2.0-34-generic-lpae, linux-image-4.2.0-34-powerpc-e500mc, linux-image-4.2.0-34-lowlatency, linux, linux-image-4.2.0-34-powerpc64-smp, linux-image-4.2.0-34-powerpc64-emb, linux-image-4.2.0-34-generic, linux-image-4.2.0-34-powerpc-smp
• USN-3052-1: linux-image-3.13.0-93-powerpc64-smp, linux-image-3.13.0-93-powerpc-smp, linux, linux-image-3.13.0-93-powerpc-e500, linux-image-3.13.0-93-lowlatency, linux-image-3.13.0-93-powerpc64-emb, linux-image-extra-3.13.0-93-generic, linux-image-3.13.0-93-generic-lpae, linux-image-3.13.0-93-powerpc-e500mc, linux-image-3.13.0-93-generic
• USN-3050-1: linux-ti-omap4, linux-image-3.2.0-1485-omap4
• USN-3053-1: linux-image-3.19.0-66-generic-lpae, linux-image-3.19.0-66-powerpc-smp, linux-lts-vivid, linux-image-3.19.0-66-powerpc64-emb, linux-image-3.19.0-66-generic, linux-image-3.19.0-66-powerpc-e500mc, linux-image-3.19.0-66-lowlatency, linux-image-3.19.0-66-powerpc64-smp, linux-image-extra-3.19.0-66-generic
• USN-3051-1: linux-lts-trusty, linux-image-3.13.0-93-generic, linux-image-3.13.0-93-generic-lpae
• USN-3049-1: linux-image-3.2.0-107-virtual, linux-image-3.2.0-107-omap, linux-image-3.2.0-107-generic, linux, linux-image-3.2.0-107-highbank, linux-image-3.2.0-107-powerpc-smp, linux-image-3.2.0-107-powerpc64-smp, linux-image-3.2.0-107-generic-pae