USN-4211-1: Linux kernel vulnerabilities
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
- linux – Linux kernel
- linux-aws – Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm – Linux kernel for cloud environments
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-snapdragon – Linux kernel for Snapdragon processors
Details
Zhipeng Xie discovered that an infinite loop could be triggered in the CFS
Linux kernel process scheduler. A local attacker could possibly use this to
cause a denial of service. (CVE-2018-20784)
Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel
did not properly validate SSID lengths. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2019-17133)
Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux
kernel performed DMA from a kernel stack. A local attacker could use this
to cause a denial of service (system crash). (CVE-2019-17075)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.4.0-1063-kvm – 4.4.0-1063.70
- linux-image-4.4.0-1099-aws – 4.4.0-1099.110
- linux-image-4.4.0-1126-raspi2 – 4.4.0-1126.135
- linux-image-4.4.0-1130-snapdragon – 4.4.0-1130.138
- linux-image-4.4.0-170-generic – 4.4.0-170.199
- linux-image-4.4.0-170-generic-lpae – 4.4.0-170.199
- linux-image-4.4.0-170-lowlatency – 4.4.0-170.199
- linux-image-4.4.0-170-powerpc-e500mc – 4.4.0-170.199
- linux-image-4.4.0-170-powerpc-smp – 4.4.0-170.199
- linux-image-4.4.0-170-powerpc64-emb – 4.4.0-170.199
- linux-image-4.4.0-170-powerpc64-smp – 4.4.0-170.199
- linux-image-aws – 4.4.0.1099.103
- linux-image-generic – 4.4.0.170.178
- linux-image-generic-lpae – 4.4.0.170.178
- linux-image-kvm – 4.4.0.1063.63
- linux-image-lowlatency – 4.4.0.170.178
- linux-image-powerpc-e500mc – 4.4.0.170.178
- linux-image-powerpc-smp – 4.4.0.170.178
- linux-image-powerpc64-emb – 4.4.0.170.178
- linux-image-powerpc64-smp – 4.4.0.170.178
- linux-image-raspi2 – 4.4.0.1126.126
- linux-image-snapdragon – 4.4.0.1130.122
- linux-image-virtual – 4.4.0.170.178
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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