Advisory Published

USN-4211-1: Linux kernel vulnerabilities

First published: Tue Dec 03 2019(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.4.0-1063-kvm<4.4.0-1063.70
4.4.0-1063.70
=16.04
All of
ubuntu/linux-image-4.4.0-1099-aws<4.4.0-1099.110
4.4.0-1099.110
=16.04
All of
ubuntu/linux-image-4.4.0-1126-raspi2<4.4.0-1126.135
4.4.0-1126.135
=16.04
All of
ubuntu/linux-image-4.4.0-1130-snapdragon<4.4.0-1130.138
4.4.0-1130.138
=16.04
All of
ubuntu/linux-image-4.4.0-170-generic<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-generic-lpae<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-lowlatency<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-powerpc-e500mc<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-powerpc-smp<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-powerpc64-emb<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-4.4.0-170-powerpc64-smp<4.4.0-170.199
4.4.0-170.199
=16.04
All of
ubuntu/linux-image-aws<4.4.0.1099.103
4.4.0.1099.103
=16.04
All of
ubuntu/linux-image-generic<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-generic-lpae<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-kvm<4.4.0.1063.63
4.4.0.1063.63
=16.04
All of
ubuntu/linux-image-lowlatency<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-powerpc-e500mc<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-powerpc-smp<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-powerpc64-emb<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-powerpc64-smp<4.4.0.170.178
4.4.0.170.178
=16.04
All of
ubuntu/linux-image-raspi2<4.4.0.1126.126
4.4.0.1126.126
=16.04
All of
ubuntu/linux-image-snapdragon<4.4.0.1130.122
4.4.0.1130.122
=16.04
All of
ubuntu/linux-image-virtual<4.4.0.170.178
4.4.0.170.178
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is CVE-2018-20784.

  • What is the severity of CVE-2018-20784?

    The severity of CVE-2018-20784 is not mentioned in the provided information.

  • How can a local attacker exploit CVE-2018-20784?

    A local attacker can exploit CVE-2018-20784 by triggering an infinite loop in the CFS Linux kernel process scheduler, causing a denial of service.

  • Which versions and packages are affected by CVE-2018-20784?

    The Linux kernel versions 4.4.0-1063.70, 4.4.0-1099.110, 4.4.0-1126.135, 4.4.0-1130.138, 4.4.0-170.199, 4.4.0-170.199, 4.4.0-170.199, 4.4.0-170.199, 4.4.0-170.199, 4.4.0.1099.103, 4.4.0.170.178, 4.4.0.170.178, 4.4.0.1063.63, 4.4.0.170.178, 4.4.0.170.178, 4.4.0.170.178, 4.4.0.170.178, 4.4.0.170.178, 4.4.0.1126.126, 4.4.0.1130.122, and 4.4.0.170.178 are affected by CVE-2018-20784.

  • Where can I find more information about CVE-2018-20784?

    You can find more information about CVE-2018-20784 at the following reference: [CVE-2018-20784](https://ubuntu.com/security/CVE-2018-20784).

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