1. Ubuntu Security Notices
  2. USN-4877-1

USN-4877-1: Linux kernel vulnerabilities

Publication date

16 March 2021

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-dell300x - Linux kernel for Dell 300x platforms
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

It was discovered that the Marvell WiFi-Ex device driver in the Linux
kernel did not properly validate ad-hoc SSIDs. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2020-36158)

吴异 discovered that the NFS implementation in the Linux kernel did not
properly prevent access outside of an NFS export that is a subdirectory of
a file system. An attacker could possibly use this to bypass NFS access
restrictions. (CVE-2021-3178)

It was discovered that the Marvell WiFi-Ex device driver in the Linux
kernel did not properly validate ad-hoc SSIDs. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2020-36158)

吴异 discovered that the NFS implementation in the Linux kernel did not
properly prevent access outside of an NFS export that is a subdirectory of
a file system. An attacker could possibly use this to bypass NFS access
restrictions. (CVE-2021-3178)

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
18.04 bionic linux-image-4.15.0-1013-dell300x –  4.15.0-1013.17
linux-image-4.15.0-1066-oracle –  4.15.0-1066.74
linux-image-4.15.0-1080-raspi2 –  4.15.0-1080.85
linux-image-4.15.0-1086-kvm –  4.15.0-1086.88
linux-image-4.15.0-1094-gcp –  4.15.0-1094.107
linux-image-4.15.0-1095-aws –  4.15.0-1095.102
linux-image-4.15.0-1097-snapdragon –  4.15.0-1097.106
linux-image-4.15.0-1109-azure –  4.15.0-1109.121
linux-image-4.15.0-137-generic –  4.15.0-137.141
linux-image-4.15.0-137-generic-lpae –  4.15.0-137.141
linux-image-4.15.0-137-lowlatency –  4.15.0-137.141
linux-image-aws-lts-18.04 –  4.15.0.1095.98
linux-image-azure-lts-18.04 –  4.15.0.1109.82
linux-image-dell300x –  4.15.0.1013.15
linux-image-gcp-lts-18.04 –  4.15.0.1094.112
linux-image-generic –  4.15.0.137.124
linux-image-generic-lpae –  4.15.0.137.124
linux-image-kvm –  4.15.0.1086.82
linux-image-lowlatency –  4.15.0.137.124
linux-image-oracle-lts-18.04 –  4.15.0.1066.76
linux-image-raspi2 –  4.15.0.1080.77
linux-image-snapdragon –  4.15.0.1097.100
linux-image-virtual –  4.15.0.137.124
16.04 xenial linux-image-4.15.0-1066-oracle –  4.15.0-1066.74~16.04.1
linux-image-4.15.0-1094-gcp –  4.15.0-1094.107~16.04.1
linux-image-4.15.0-1095-aws –  4.15.0-1095.102~16.04.1
linux-image-4.15.0-1109-azure –  4.15.0-1109.121~16.04.1
linux-image-4.15.0-137-generic –  4.15.0-137.141~16.04.1
linux-image-4.15.0-137-generic-lpae –  4.15.0-137.141~16.04.1
linux-image-4.15.0-137-lowlatency –  4.15.0-137.141~16.04.1
linux-image-aws-hwe –  4.15.0.1095.88
linux-image-azure –  4.15.0.1109.100
linux-image-gcp –  4.15.0.1094.95
linux-image-generic-hwe-16.04 –  4.15.0.137.133
linux-image-generic-lpae-hwe-16.04 –  4.15.0.137.133
linux-image-gke –  4.15.0.1094.95
linux-image-lowlatency-hwe-16.04 –  4.15.0.137.133
linux-image-oem –  4.15.0.137.133
linux-image-oracle –  4.15.0.1066.54
linux-image-virtual-hwe-16.04 –  4.15.0.137.133
14.04 trusty linux-image-4.15.0-1109-azure –  4.15.0-1109.121~14.04.1
linux-image-azure –  4.15.0.1109.82

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References

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