1. Ubuntu Security Notices
  2. USN-4211-1

USN-4211-1: Linux kernel vulnerabilities

Publication date

3 December 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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)

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
16.04 xenial 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

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References

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