USN-4041-2: Linux kernel (HWE) update
linux-lts-xenial, linux-aws, linux-azure update
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
Summary
Several security issues were fixed in the Linux kernel.
Software Description
- linux-aws – Linux kernel for Amazon Web Services (AWS) systems
- linux-azure – Linux kernel for Microsoft Azure Cloud systems
- linux-lts-xenial – Linux hardware enablement kernel from Xenial for Trusty
Details
USN-4041-1 provided updates for the Linux kernel in Ubuntu.
This update provides the corresponding updates for the Linux kernel
for Ubuntu 16.04 ESM.
USN-4017-2 fixed vulnerabilities in the Linux kernel. Unfortunately,
the update introduced a regression that interfered with networking
applications that setup very low SO_SNDBUF values. This update fixes
the problem.
We apologize for the inconvenience.
Jonathan Looney discovered that the Linux kernel could be coerced into
segmenting responses into multiple TCP segments. A remote attacker could
construct an ongoing sequence of requests to cause a denial of service.
(CVE-2019-11479)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.04 ESM
- linux-image-4.15.0-1049-azure – 4.15.0-1049.54~14.04.1
- linux-image-4.4.0-1048-aws – 4.4.0-1048.52
- linux-image-4.4.0-154-generic – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-generic-lpae – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-lowlatency – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-powerpc-e500mc – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-powerpc-smp – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-powerpc64-emb – 4.4.0-154.181~14.04.1
- linux-image-4.4.0-154-powerpc64-smp – 4.4.0-154.181~14.04.1
- linux-image-aws – 4.4.0.1048.49
- linux-image-azure – 4.15.0.1049.36
- linux-image-generic-lpae-lts-xenial – 4.4.0.154.135
- linux-image-generic-lts-xenial – 4.4.0.154.135
- linux-image-lowlatency-lts-xenial – 4.4.0.154.135
- linux-image-powerpc-e500mc-lts-xenial – 4.4.0.154.135
- linux-image-powerpc-smp-lts-xenial – 4.4.0.154.135
- linux-image-powerpc64-emb-lts-xenial – 4.4.0.154.135
- linux-image-powerpc64-smp-lts-xenial – 4.4.0.154.135
- linux-image-virtual-lts-xenial – 4.4.0.154.135
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.
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