1. Ubuntu Security Notices
  2. USN-5267-2

USN-5267-2: Linux kernel regression

Publication date

11 February 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-5.4 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke - Linux kernel for Google Container Engine (GKE) systems
  • linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-ibm - Linux kernel for IBM cloud systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.4 - Linux kernel for Oracle Cloud systems

Details

USN-5267-1 fixed vulnerabilities in the Linux kernel. Unfortunately,
that update introduced a regression that caused the kernel to freeze
when accessing CIFS shares in some situations. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the Bluetooth subsystem in the Linux kernel
contained a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)

Luo Likang discovered that the FireDTV Firewire...

USN-5267-1 fixed vulnerabilities in the Linux kernel. Unfortunately,
that update introduced a regression that caused the kernel to freeze
when accessing CIFS shares in some situations. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the Bluetooth subsystem in the Linux kernel
contained a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-42739)

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
20.04 focal linux-image-5.4.0-99-lowlatency –  5.4.0-99.112
linux-image-gkeop –  5.4.0.1033.36
linux-image-virtual –  5.4.0.99.103
linux-image-5.4.0-99-generic –  5.4.0-99.112
linux-image-generic –  5.4.0.99.103
linux-image-oem –  5.4.0.99.103
linux-image-5.4.0-1033-gkeop –  5.4.0-1033.34
linux-image-5.4.0-1055-kvm –  5.4.0-1055.57
linux-image-5.4.0-1065-aws –  5.4.0-1065.68
linux-image-ibm –  5.4.0.1014.15
linux-image-5.4.0-1063-oracle –  5.4.0-1063.67
linux-image-oem-osp1 –  5.4.0.99.103
linux-image-gke-5.4 –  5.4.0.1062.72
linux-image-5.4.0-1062-gke –  5.4.0-1062.65
linux-image-5.4.0-1014-ibm –  5.4.0-1014.15
linux-image-5.4.0-1069-azure –  5.4.0-1069.72
linux-image-5.4.0-99-generic-lpae –  5.4.0-99.112
linux-image-azure-lts-20.04 –  5.4.0.1069.67
linux-image-gkeop-5.4 –  5.4.0.1033.36
linux-image-gcp-lts-20.04 –  5.4.0.1064.74
linux-image-ibm-lts-20.04 –  5.4.0.1014.15
linux-image-aws-lts-20.04 –  5.4.0.1065.67
linux-image-5.4.0-1064-gcp –  5.4.0-1064.68
linux-image-generic-lpae –  5.4.0.99.103
linux-image-gke –  5.4.0.1062.72
linux-image-oracle-lts-20.04 –  5.4.0.1063.63
linux-image-kvm –  5.4.0.1055.54
linux-image-lowlatency –  5.4.0.99.103
18.04 bionic linux-image-generic-hwe-18.04 –  5.4.0.99.112~18.04.86
linux-image-5.4.0-99-generic –  5.4.0-99.112~18.04.1
linux-image-oem –  5.4.0.99.112~18.04.86
linux-image-5.4.0-1033-gkeop –  5.4.0-1033.34~18.04.1
linux-image-aws –  5.4.0.1065.47
linux-image-5.4.0-1063-oracle –  5.4.0-1063.67~18.04.1
linux-image-oem-osp1 –  5.4.0.99.112~18.04.86
linux-image-5.4.0-1062-gke –  5.4.0-1062.65~18.04.1
linux-image-generic-lpae-hwe-18.04 –  5.4.0.99.112~18.04.86
linux-image-5.4.0-99-generic-lpae –  5.4.0-99.112~18.04.1
linux-image-snapdragon-hwe-18.04 –  5.4.0.99.112~18.04.86
linux-image-gkeop-5.4 –  5.4.0.1033.34~18.04.33
linux-image-azure –  5.4.0.1069.48
linux-image-virtual-hwe-18.04 –  5.4.0.99.112~18.04.86
linux-image-5.4.0-1064-gcp –  5.4.0-1064.68~18.04.1
linux-image-gcp –  5.4.0.1064.49
linux-image-5.4.0-1069-azure –  5.4.0-1069.72~18.04.1
linux-image-oracle –  5.4.0.1063.67~18.04.42
linux-image-5.4.0-99-lowlatency –  5.4.0-99.112~18.04.1
linux-image-lowlatency-hwe-18.04 –  5.4.0.99.112~18.04.86
linux-image-gke-5.4 –  5.4.0.1062.65~18.04.26

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References

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