USN-4211-1: Linux kernel vulnerabilities

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.

References

• CVE-2018-20784
• CVE-2019-17075
• CVE-2019-17133

Source: USN-4211-1: Linux kernel vulnerabilities