--- title: 'USN-5267-2: Linux kernel regression | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-5267-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/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 [20.04 LTS](https://ubuntu.com/security/notices?release=focal) [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) --- Open side navigation ## Packages * [linux](https://ubuntu.com/security/cves?package=linux) - Linux kernel * [linux-aws](https://ubuntu.com/security/cves?package=linux-aws) - Linux kernel for Amazon Web Services (AWS) systems * [linux-aws-5.4](https://ubuntu.com/security/cves?package=linux-aws-5.4) - Linux kernel for Amazon Web Services (AWS) systems * [linux-azure](https://ubuntu.com/security/cves?package=linux-azure) - Linux kernel for Microsoft Azure Cloud systems * [linux-azure-5.4](https://ubuntu.com/security/cves?package=linux-azure-5.4) - Linux kernel for Microsoft Azure cloud systems * [linux-gcp](https://ubuntu.com/security/cves?package=linux-gcp) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gcp-5.4](https://ubuntu.com/security/cves?package=linux-gcp-5.4) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gke](https://ubuntu.com/security/cves?package=linux-gke) - Linux kernel for Google Container Engine (GKE) systems * [linux-gke-5.4](https://ubuntu.com/security/cves?package=linux-gke-5.4) - Linux kernel for Google Container Engine (GKE) systems * [linux-gkeop](https://ubuntu.com/security/cves?package=linux-gkeop) - Linux kernel for Google Container Engine (GKE) systems * [linux-gkeop-5.4](https://ubuntu.com/security/cves?package=linux-gkeop-5.4) - Linux kernel for Google Container Engine (GKE) systems * [linux-hwe-5.4](https://ubuntu.com/security/cves?package=linux-hwe-5.4) - Linux hardware enablement (HWE) kernel * [linux-ibm](https://ubuntu.com/security/cves?package=linux-ibm) - Linux kernel for IBM cloud systems * [linux-kvm](https://ubuntu.com/security/cves?package=linux-kvm) - Linux kernel for cloud environments * [linux-oracle](https://ubuntu.com/security/cves?package=linux-oracle) - Linux kernel for Oracle Cloud systems * [linux-oracle-5.4](https://ubuntu.com/security/cves?package=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](https://ubuntu.com/security/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](https://ubuntu.com/security/CVE-2021-3752)) Luo Likang discovered that the FireDTV Firewire... --- Show more ## 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.](https://ubuntu.com/security/cves/about#security) 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 LTS focal | [linux-image-5.4.0-99-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.4.0-99.112](https://launchpad.net/ubuntu/+source/linux-signed/5.4.0-99.112) | | | | [linux-image-gkeop](https://launchpad.net/ubuntu/+source/linux-meta-gkeop) –  [5.4.0.1033.36](https://launchpad.net/ubuntu/+source/linux-meta-gkeop/5.4.0.1033.36) | | | | [linux-image-virtual](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | [linux-image-5.4.0-99-generic](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.4.0-99.112](https://launchpad.net/ubuntu/+source/linux-signed/5.4.0-99.112) | | | | [linux-image-generic](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | [linux-image-oem](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | [linux-image-5.4.0-1033-gkeop](https://launchpad.net/ubuntu/+source/linux-signed-gkeop) –  [5.4.0-1033.34](https://launchpad.net/ubuntu/+source/linux-signed-gkeop/5.4.0-1033.34) | | | | [linux-image-5.4.0-1055-kvm](https://launchpad.net/ubuntu/+source/linux-signed-kvm) –  [5.4.0-1055.57](https://launchpad.net/ubuntu/+source/linux-signed-kvm/5.4.0-1055.57) | | | | [linux-image-5.4.0-1065-aws](https://launchpad.net/ubuntu/+source/linux-signed-aws) –  [5.4.0-1065.68](https://launchpad.net/ubuntu/+source/linux-signed-aws/5.4.0-1065.68) | | | | [linux-image-ibm](https://launchpad.net/ubuntu/+source/linux-meta-ibm) –  [5.4.0.1014.15](https://launchpad.net/ubuntu/+source/linux-meta-ibm/5.4.0.1014.15) | | | | [linux-image-5.4.0-1063-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle) –  [5.4.0-1063.67](https://launchpad.net/ubuntu/+source/linux-signed-oracle/5.4.0-1063.67) | | | | [linux-image-oem-osp1](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | [linux-image-gke-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [5.4.0.1062.72](https://launchpad.net/ubuntu/+source/linux-meta-gke/5.4.0.1062.72) | | | | [linux-image-5.4.0-1062-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke) –  [5.4.0-1062.65](https://launchpad.net/ubuntu/+source/linux-signed-gke/5.4.0-1062.65) | | | | [linux-image-5.4.0-1014-ibm](https://launchpad.net/ubuntu/+source/linux-signed-ibm) –  [5.4.0-1014.15](https://launchpad.net/ubuntu/+source/linux-signed-ibm/5.4.0-1014.15) | | | | [linux-image-5.4.0-1069-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure) –  [5.4.0-1069.72](https://launchpad.net/ubuntu/+source/linux-signed-azure/5.4.0-1069.72) | | | | [linux-image-5.4.0-99-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [5.4.0-99.112](https://launchpad.net/ubuntu/+source/linux/5.4.0-99.112) | | | | [linux-image-azure-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-azure) –  [5.4.0.1069.67](https://launchpad.net/ubuntu/+source/linux-meta-azure/5.4.0.1069.67) | | | | [linux-image-gkeop-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gkeop) –  [5.4.0.1033.36](https://launchpad.net/ubuntu/+source/linux-meta-gkeop/5.4.0.1033.36) | | | | [linux-image-gcp-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  [5.4.0.1064.74](https://launchpad.net/ubuntu/+source/linux-meta-gcp/5.4.0.1064.74) | | | | [linux-image-ibm-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-ibm) –  [5.4.0.1014.15](https://launchpad.net/ubuntu/+source/linux-meta-ibm/5.4.0.1014.15) | | | | [linux-image-aws-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-aws) –  [5.4.0.1065.67](https://launchpad.net/ubuntu/+source/linux-meta-aws/5.4.0.1065.67) | | | | [linux-image-5.4.0-1064-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp) –  [5.4.0-1064.68](https://launchpad.net/ubuntu/+source/linux-signed-gcp/5.4.0-1064.68) | | | | [linux-image-generic-lpae](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | [linux-image-gke](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [5.4.0.1062.72](https://launchpad.net/ubuntu/+source/linux-meta-gke/5.4.0.1062.72) | | | | [linux-image-oracle-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-oracle) –  [5.4.0.1063.63](https://launchpad.net/ubuntu/+source/linux-meta-oracle/5.4.0.1063.63) | | | | [linux-image-kvm](https://launchpad.net/ubuntu/+source/linux-meta-kvm) –  [5.4.0.1055.54](https://launchpad.net/ubuntu/+source/linux-meta-kvm/5.4.0.1055.54) | | | | [linux-image-lowlatency](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.99.103](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.99.103) | | | | 18.04 LTS bionic | [linux-image-generic-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-5.4.0-99-generic](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4) –  [5.4.0-99.112~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4/5.4.0-99.112~18.04.1) | | | | [linux-image-oem](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-5.4.0-1033-gkeop](https://launchpad.net/ubuntu/+source/linux-signed-gkeop-5.4) –  [5.4.0-1033.34~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gkeop-5.4/5.4.0-1033.34~18.04.1) | | | | [linux-image-aws](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.4) –  [5.4.0.1065.47](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.4/5.4.0.1065.47) | | | | [linux-image-5.4.0-1063-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.4) –  [5.4.0-1063.67~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.4/5.4.0-1063.67~18.04.1) | | | | [linux-image-oem-osp1](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-5.4.0-1062-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.4) –  [5.4.0-1062.65~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.4/5.4.0-1062.65~18.04.1) | | | | [linux-image-generic-lpae-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-5.4.0-99-generic-lpae](https://launchpad.net/ubuntu/+source/linux-hwe-5.4) –  [5.4.0-99.112~18.04.1](https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-99.112~18.04.1) | | | | [linux-image-snapdragon-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-gkeop-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gkeop-5.4) –  [5.4.0.1033.34~18.04.33](https://launchpad.net/ubuntu/+source/linux-meta-gkeop-5.4/5.4.0.1033.34~18.04.33) | | | | [linux-image-azure](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.4) –  [5.4.0.1069.48](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.4/5.4.0.1069.48) | | | | [linux-image-virtual-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-5.4.0-1064-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.4) –  [5.4.0-1064.68~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.4/5.4.0-1064.68~18.04.1) | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.4) –  [5.4.0.1064.49](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.4/5.4.0.1064.49) | | | | [linux-image-5.4.0-1069-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.4) –  [5.4.0-1069.72~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.4/5.4.0-1069.72~18.04.1) | | | | [linux-image-oracle](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.4) –  [5.4.0.1063.67~18.04.42](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.4/5.4.0.1063.67~18.04.42) | | | | [linux-image-5.4.0-99-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4) –  [5.4.0-99.112~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4/5.4.0-99.112~18.04.1) | | | | [linux-image-lowlatency-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.99.112~18.04.86](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.99.112~18.04.86) | | | | [linux-image-gke-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.4) –  [5.4.0.1062.65~18.04.26](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.4/5.4.0.1062.65~18.04.26) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. 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