1. Ubuntu Security Notices
  2. USN-5385-1

USN-5385-1: Linux kernel vulnerabilities

Publication date

21 April 2022

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-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Brendan Dolan-Gavitt discovered that the aQuantia AQtion Ethernet device
driver in the Linux kernel did not properly validate meta-data coming from
the device. A local attacker who can control an emulated device can use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-43975)

It was discovered that the UDF file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious UDF image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2022-0617)

Lyu Tao discovered that the NFS implementation in the Linux kernel did not
properly handle requests to open a directory on a regular file. A local
attacker could use this to expose sensitive information (kernel memory).
(

Brendan Dolan-Gavitt discovered that the aQuantia AQtion Ethernet device
driver in the Linux kernel did not properly validate meta-data coming from
the device. A local attacker who can control an emulated device can use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-43975)

It was discovered that the UDF file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious UDF image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2022-0617)

Lyu Tao discovered that the NFS implementation in the Linux kernel did not
properly handle requests to open a directory on a regular file. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2022-24448)

It was discovered that the YAM AX.25 device driver in the Linux kernel did
not properly deallocate memory in some error conditions. A local privileged
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2022-24959)

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-virtual –  4.15.0.176.165
linux-image-azure-lts-18.04 –  4.15.0.1137.110
linux-image-aws-lts-18.04 –  4.15.0.1127.130
linux-image-generic –  4.15.0.176.165
linux-image-4.15.0-1127-aws –  4.15.0-1127.136
linux-image-4.15.0-176-generic –  4.15.0-176.185
linux-image-oracle-lts-18.04 –  4.15.0.1092.102
linux-image-4.15.0-1092-oracle –  4.15.0-1092.101
linux-image-4.15.0-1137-azure –  4.15.0-1137.150
linux-image-snapdragon –  4.15.0.1126.129
linux-image-dell300x –  4.15.0.1041.43
linux-image-4.15.0-1126-snapdragon –  4.15.0-1126.135
linux-image-4.15.0-1041-dell300x –  4.15.0-1041.46
linux-image-4.15.0-1121-gcp –  4.15.0-1121.135
linux-image-4.15.0-176-lowlatency –  4.15.0-176.185
linux-image-gcp-lts-18.04 –  4.15.0.1121.140
linux-image-4.15.0-1113-kvm –  4.15.0-1113.116
linux-image-kvm –  4.15.0.1113.109
linux-image-4.15.0-176-generic-lpae –  4.15.0-176.185
linux-image-generic-lpae –  4.15.0.176.165
linux-image-lowlatency –  4.15.0.176.165
16.04 xenial linux-image-lowlatency-hwe-16.04 –  4.15.0.176.168  
linux-image-oem –  4.15.0.176.168  
linux-image-4.15.0-176-generic –  4.15.0-176.185~16.04.1  
linux-image-4.15.0-1092-oracle –  4.15.0-1092.101~16.04.1  
linux-image-4.15.0-1137-azure –  4.15.0-1137.150~16.04.1  
linux-image-4.15.0-1127-aws-hwe –  4.15.0-1127.136~16.04.1  
linux-image-azure –  4.15.0.1137.127  
linux-image-gke –  4.15.0.1121.122  
linux-image-gcp –  4.15.0.1121.122  
linux-image-4.15.0-1121-gcp –  4.15.0-1121.135~16.04.1  
linux-image-4.15.0-176-lowlatency –  4.15.0-176.185~16.04.1  
linux-image-aws-hwe –  4.15.0.1127.117  
linux-image-generic-hwe-16.04 –  4.15.0.176.168  
linux-image-oracle –  4.15.0.1092.80  
linux-image-virtual-hwe-16.04 –  4.15.0.176.168  
14.04 trusty linux-image-4.15.0-1137-azure –  4.15.0-1137.150~14.04.1  
linux-image-azure –  4.15.0.1137.109  

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References

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