--- title: 'USN-4982-1: Linux kernel vulnerabilities | 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-4982-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4982-1 --- # USN-4982-1: Linux kernel vulnerabilities Publication date 8 June 2021 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-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 * [linux-raspi](https://ubuntu.com/security/cves?package=linux-raspi) - Linux kernel for Raspberry Pi (V8) systems * [linux-raspi-5.4](https://ubuntu.com/security/cves?package=linux-raspi-5.4) - Linux kernel for Raspberry Pi (V8) systems ## Details Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). ([CVE-2020-25670](https://ubuntu.com/security/CVE-2020-25670)) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). ([CVE-2020-25671](https://ubuntu.com/security/CVE-2020-25671), [CVE-2020-25672](https://ubuntu.com/security/CVE-2020-25672)) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to cause a denial of service. ([CVE-2020-25673](https://ubuntu.com/security/CVE-2020-25673)) It was discovered that the Xen paravirtualization... --- 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-5.4.0-1016-gkeop](https://launchpad.net/ubuntu/+source/linux-signed-gkeop) –  [5.4.0-1016.17](https://launchpad.net/ubuntu/+source/linux-signed-gkeop/5.4.0-1016.17) | | | | [linux-image-5.4.0-1036-raspi](https://launchpad.net/ubuntu/+source/linux-raspi) –  [5.4.0-1036.39](https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1036.39) | | | | [linux-image-5.4.0-1040-kvm](https://launchpad.net/ubuntu/+source/linux-signed-kvm) –  [5.4.0-1040.41](https://launchpad.net/ubuntu/+source/linux-signed-kvm/5.4.0-1040.41) | | | | [linux-image-5.4.0-1044-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp) –  [5.4.0-1044.47](https://launchpad.net/ubuntu/+source/linux-signed-gcp/5.4.0-1044.47) | | | | [linux-image-5.4.0-1044-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke) –  [5.4.0-1044.46](https://launchpad.net/ubuntu/+source/linux-signed-gke/5.4.0-1044.46) | | | | [linux-image-5.4.0-1046-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle) –  [5.4.0-1046.50](https://launchpad.net/ubuntu/+source/linux-signed-oracle/5.4.0-1046.50) | | | | [linux-image-5.4.0-1048-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure) –  [5.4.0-1048.50](https://launchpad.net/ubuntu/+source/linux-signed-azure/5.4.0-1048.50) | | | | [linux-image-5.4.0-1049-aws](https://launchpad.net/ubuntu/+source/linux-aws) –  [5.4.0-1049.51](https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1049.51) | | | | [linux-image-5.4.0-74-generic](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.4.0-74.83](https://launchpad.net/ubuntu/+source/linux-signed/5.4.0-74.83) | | | | [linux-image-5.4.0-74-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [5.4.0-74.83](https://launchpad.net/ubuntu/+source/linux/5.4.0-74.83) | | | | [linux-image-5.4.0-74-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.4.0-74.83](https://launchpad.net/ubuntu/+source/linux-signed/5.4.0-74.83) | | | | [linux-image-aws](https://launchpad.net/ubuntu/+source/linux-meta-aws) –  [5.4.0.1049.50](https://launchpad.net/ubuntu/+source/linux-meta-aws/5.4.0.1049.50) | | | | [linux-image-azure](https://launchpad.net/ubuntu/+source/linux-meta-azure) –  [5.4.0.1048.46](https://launchpad.net/ubuntu/+source/linux-meta-azure/5.4.0.1048.46) | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  [5.4.0.1044.53](https://launchpad.net/ubuntu/+source/linux-meta-gcp/5.4.0.1044.53) | | | | [linux-image-generic](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-generic-lpae](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-gke](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [5.4.0.1044.53](https://launchpad.net/ubuntu/+source/linux-meta-gke/5.4.0.1044.53) | | | | [linux-image-gke-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [5.4.0.1044.53](https://launchpad.net/ubuntu/+source/linux-meta-gke/5.4.0.1044.53) | | | | [linux-image-gkeop](https://launchpad.net/ubuntu/+source/linux-meta-gkeop) –  [5.4.0.1016.19](https://launchpad.net/ubuntu/+source/linux-meta-gkeop/5.4.0.1016.19) | | | | [linux-image-gkeop-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gkeop) –  [5.4.0.1016.19](https://launchpad.net/ubuntu/+source/linux-meta-gkeop/5.4.0.1016.19) | | | | [linux-image-kvm](https://launchpad.net/ubuntu/+source/linux-meta-kvm) –  [5.4.0.1040.38](https://launchpad.net/ubuntu/+source/linux-meta-kvm/5.4.0.1040.38) | | | | [linux-image-lowlatency](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-oem](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-oem-osp1](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-oracle](https://launchpad.net/ubuntu/+source/linux-meta-oracle) –  [5.4.0.1046.45](https://launchpad.net/ubuntu/+source/linux-meta-oracle/5.4.0.1046.45) | | | | [linux-image-raspi](https://launchpad.net/ubuntu/+source/linux-meta-raspi) –  [5.4.0.1036.71](https://launchpad.net/ubuntu/+source/linux-meta-raspi/5.4.0.1036.71) | | | | [linux-image-raspi2](https://launchpad.net/ubuntu/+source/linux-meta-raspi) –  [5.4.0.1036.71](https://launchpad.net/ubuntu/+source/linux-meta-raspi/5.4.0.1036.71) | | | | [linux-image-virtual](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | [linux-image-virtual-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.4.0.74.77](https://launchpad.net/ubuntu/+source/linux-meta/5.4.0.74.77) | | | | 18.04 LTS bionic | [linux-image-5.4.0-1016-gkeop](https://launchpad.net/ubuntu/+source/linux-signed-gkeop-5.4) –  [5.4.0-1016.17~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gkeop-5.4/5.4.0-1016.17~18.04.1) | | | | [linux-image-5.4.0-1036-raspi](https://launchpad.net/ubuntu/+source/linux-raspi-5.4) –  [5.4.0-1036.39~18.04.1](https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1036.39~18.04.1) | | | | [linux-image-5.4.0-1044-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.4) –  [5.4.0-1044.47~18.04.2](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.4/5.4.0-1044.47~18.04.2) | | | | [linux-image-5.4.0-1044-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.4) –  [5.4.0-1044.46~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.4/5.4.0-1044.46~18.04.1) | | | | [linux-image-5.4.0-1046-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.4) –  [5.4.0-1046.50~18.04.2](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.4/5.4.0-1046.50~18.04.2) | | | | [linux-image-5.4.0-1048-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.4) –  [5.4.0-1048.50~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.4/5.4.0-1048.50~18.04.1) | | | | [linux-image-5.4.0-1049-aws](https://launchpad.net/ubuntu/+source/linux-aws-5.4) –  [5.4.0-1049.51~18.04.1](https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1049.51~18.04.1) | | | | [linux-image-5.4.0-74-generic](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4) –  [5.4.0-74.83~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4/5.4.0-74.83~18.04.1) | | | | [linux-image-5.4.0-74-generic-lpae](https://launchpad.net/ubuntu/+source/linux-hwe-5.4) –  [5.4.0-74.83~18.04.1](https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-74.83~18.04.1) | | | | [linux-image-5.4.0-74-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4) –  [5.4.0-74.83~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.4/5.4.0-74.83~18.04.1) | | | | [linux-image-aws](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.4) –  [5.4.0.1049.31](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.4/5.4.0.1049.31) | | | | [linux-image-azure](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.4) –  [5.4.0.1048.27](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.4/5.4.0.1048.27) | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.4) –  [5.4.0.1044.31](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.4/5.4.0.1044.31) | | | | [linux-image-generic-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-generic-lpae-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-gke-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.4) –  [5.4.0.1044.46~18.04.10](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.4/5.4.0.1044.46~18.04.10) | | | | [linux-image-gkeop-5.4](https://launchpad.net/ubuntu/+source/linux-meta-gkeop-5.4) –  [5.4.0.1016.17~18.04.17](https://launchpad.net/ubuntu/+source/linux-meta-gkeop-5.4/5.4.0.1016.17~18.04.17) | | | | [linux-image-lowlatency-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-oem](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-oem-osp1](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-oracle](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.4) –  [5.4.0.1046.50~18.04.28](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.4/5.4.0.1046.50~18.04.28) | | | | [linux-image-raspi-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-raspi-5.4) –  [5.4.0.1036.38](https://launchpad.net/ubuntu/+source/linux-meta-raspi-5.4/5.4.0.1036.38) | | | | [linux-image-snapdragon-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | | [linux-image-virtual-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4) –  [5.4.0.74.83~18.04.67](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.4/5.4.0.74.83~18.04.67) | | | --- ### 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. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2021-3483](https://ubuntu.com/security/CVE-2021-3483) * [CVE-2021-31916](https://ubuntu.com/security/CVE-2021-31916) * [CVE-2021-29647](https://ubuntu.com/security/CVE-2021-29647) * [CVE-2021-29264](https://ubuntu.com/security/CVE-2021-29264) * [CVE-2021-28972](https://ubuntu.com/security/CVE-2021-28972) * [CVE-2021-28971](https://ubuntu.com/security/CVE-2021-28971) * [CVE-2021-28964](https://ubuntu.com/security/CVE-2021-28964) * [CVE-2021-28950](https://ubuntu.com/security/CVE-2021-28950) * [CVE-2021-28688](https://ubuntu.com/security/CVE-2021-28688) * [CVE-2020-25673](https://ubuntu.com/security/CVE-2020-25673) --- Show 3 more references ## Related notices * [USN-5361-1](https://ubuntu.com/security/notices/USN-5361-1) * [USN-5343-1](https://ubuntu.com/security/notices/USN-5343-1) * [USN-5299-1](https://ubuntu.com/security/notices/USN-5299-1) * [USN-4999-1](https://ubuntu.com/security/notices/USN-4999-1) * [USN-4984-1](https://ubuntu.com/security/notices/USN-4984-1) * [USN-4979-1](https://ubuntu.com/security/notices/USN-4979-1) * [USN-4977-1](https://ubuntu.com/security/notices/USN-4977-1) * [USN-4949-1](https://ubuntu.com/security/notices/USN-4949-1) * [USN-4948-1](https://ubuntu.com/security/notices/USN-4948-1) * [USN-4946-1](https://ubuntu.com/security/notices/USN-4946-1) --- Show 1 more references --- Have additional questions? 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