--- title: 'USN-5113-1: 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-5113-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-5113-1 --- # USN-5113-1: Linux kernel vulnerabilities Publication date 19 October 2021 Overview Several security issues were fixed in the Linux kernel. Releases [21.04](https://ubuntu.com/security/notices?release=hirsute) [20.04 LTS](https://ubuntu.com/security/notices?release=focal) --- 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-5.11](https://ubuntu.com/security/cves?package=linux-aws-5.11) - 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-5.11](https://ubuntu.com/security/cves?package=linux-azure-5.11) - 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-5.11](https://ubuntu.com/security/cves?package=linux-gcp-5.11) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-hwe-5.11](https://ubuntu.com/security/cves?package=linux-hwe-5.11) - 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-5.11](https://ubuntu.com/security/cves?package=linux-oracle-5.11) - Linux kernel for Oracle Cloud systems * [linux-raspi](https://ubuntu.com/security/cves?package=linux-raspi) - Linux kernel for Raspberry Pi systems ## Details It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information (WiFi network traffic). ([CVE-2020-3702](https://ubuntu.com/security/CVE-2020-3702)) Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. ([CVE-2021-3732](https://ubuntu.com/security/CVE-2021-3732)) It was discovered that the btrfs file system in the Linux kernel did not properly handle removing a non-existent device id. An attacker with CAP\_SYS\_ADMIN could use this to cause a denial of service. ([CVE-2021-3739](https://ubuntu.com/security/CVE-2021-3739)) It was discovered that the Qualcomm IPC Router protocol implementation in the Linux kernel did not properly validate metadata in some situations. A local attacker could use this to cause a... --- 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 | | --- | --- | | 21.04 hirsute | [linux-image-5.11.0-1021-raspi-nolpae](https://launchpad.net/ubuntu/+source/linux-raspi) –  [5.11.0-1021.22](https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1021.22) | | | | [linux-image-virtual](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-generic-64k](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-generic](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-5.11.0-38-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.11.0-38.42](https://launchpad.net/ubuntu/+source/linux-signed/5.11.0-38.42) | | | | [linux-image-5.11.0-38-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [5.11.0-38.42](https://launchpad.net/ubuntu/+source/linux/5.11.0-38.42) | | | | [linux-image-aws](https://launchpad.net/ubuntu/+source/linux-meta-aws) –  [5.11.0.1020.21](https://launchpad.net/ubuntu/+source/linux-meta-aws/5.11.0.1020.21) | | | | [linux-image-oracle](https://launchpad.net/ubuntu/+source/linux-meta-oracle) –  [5.11.0.1020.21](https://launchpad.net/ubuntu/+source/linux-meta-oracle/5.11.0.1020.21) | | | | [linux-image-5.11.0-1020-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure) –  [5.11.0-1020.21](https://launchpad.net/ubuntu/+source/linux-signed-azure/5.11.0-1020.21) | | | | [linux-image-5.11.0-38-generic](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.11.0-38.42](https://launchpad.net/ubuntu/+source/linux-signed/5.11.0-38.42) | | | | [linux-image-5.11.0-1018-kvm](https://launchpad.net/ubuntu/+source/linux-signed-kvm) –  [5.11.0-1018.19](https://launchpad.net/ubuntu/+source/linux-signed-kvm/5.11.0-1018.19) | | | | [linux-image-azure](https://launchpad.net/ubuntu/+source/linux-meta-azure) –  [5.11.0.1020.21](https://launchpad.net/ubuntu/+source/linux-meta-azure/5.11.0.1020.21) | | | | [linux-image-raspi-nolpae](https://launchpad.net/ubuntu/+source/linux-meta-raspi) –  [5.11.0.1021.19](https://launchpad.net/ubuntu/+source/linux-meta-raspi/5.11.0.1021.19) | | | | [linux-image-oem-20.04](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-gke](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  [5.11.0.1021.21](https://launchpad.net/ubuntu/+source/linux-meta-gcp/5.11.0.1021.21) | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  [5.11.0.1021.21](https://launchpad.net/ubuntu/+source/linux-meta-gcp/5.11.0.1021.21) | | | | [linux-image-5.11.0-1021-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp) –  [5.11.0-1021.23](https://launchpad.net/ubuntu/+source/linux-signed-gcp/5.11.0-1021.23) | | | | [linux-image-5.11.0-1020-aws](https://launchpad.net/ubuntu/+source/linux-aws) –  [5.11.0-1020.21](https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1020.21) | | | | [linux-image-raspi](https://launchpad.net/ubuntu/+source/linux-meta-raspi) –  [5.11.0.1021.19](https://launchpad.net/ubuntu/+source/linux-meta-raspi/5.11.0.1021.19) | | | | [linux-image-5.11.0-1020-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle) –  [5.11.0-1020.21](https://launchpad.net/ubuntu/+source/linux-signed-oracle/5.11.0-1020.21) | | | | [linux-image-kvm](https://launchpad.net/ubuntu/+source/linux-meta-kvm) –  [5.11.0.1018.19](https://launchpad.net/ubuntu/+source/linux-meta-kvm/5.11.0.1018.19) | | | | [linux-image-generic-lpae](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-lowlatency](https://launchpad.net/ubuntu/+source/linux-meta) –  [5.11.0.38.39](https://launchpad.net/ubuntu/+source/linux-meta/5.11.0.38.39) | | | | [linux-image-5.11.0-38-generic-64k](https://launchpad.net/ubuntu/+source/linux-signed) –  [5.11.0-38.42](https://launchpad.net/ubuntu/+source/linux-signed/5.11.0-38.42) | | | | [linux-image-5.11.0-1021-raspi](https://launchpad.net/ubuntu/+source/linux-raspi) –  [5.11.0-1021.22](https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1021.22) | | | | 20.04 LTS focal | [linux-image-virtual-hwe-20.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11) –  [5.11.0.38.42~20.04.17](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/5.11.0.38.42~20.04.17) | | | | [linux-image-azure-edge](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.11) –  [5.11.0.1020.21~20.04.19](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.11/5.11.0.1020.21~20.04.19) | | | | [linux-image-5.11.0-38-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11) –  [5.11.0-38.42~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11/5.11.0-38.42~20.04.1) | | | | [linux-image-5.11.0-38-generic-lpae](https://launchpad.net/ubuntu/+source/linux-hwe-5.11) –  [5.11.0-38.42~20.04.1](https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-38.42~20.04.1) | | | | [linux-image-aws](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.11) –  [5.11.0.1020.21~20.04.19](https://launchpad.net/ubuntu/+source/linux-meta-aws-5.11/5.11.0.1020.21~20.04.19) | | | | [linux-image-oracle](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.11) –  [5.11.0.1020.21~20.04.13](https://launchpad.net/ubuntu/+source/linux-meta-oracle-5.11/5.11.0.1020.21~20.04.13) | | | | [linux-image-5.11.0-1020-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.11) –  [5.11.0-1020.21~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.11/5.11.0-1020.21~20.04.1) | | | | [linux-image-lowlatency-hwe-20.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11) –  [5.11.0.38.42~20.04.17](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/5.11.0.38.42~20.04.17) | | | | [linux-image-generic-hwe-20.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11) –  [5.11.0.38.42~20.04.17](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/5.11.0.38.42~20.04.17) | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.11) –  [5.11.0.1021.23~20.04.20](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.11/5.11.0.1021.23~20.04.20) | | | | [linux-image-5.11.0-1021-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.11) –  [5.11.0-1021.23~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.11/5.11.0-1021.23~20.04.1) | | | | [linux-image-5.11.0-1020-aws](https://launchpad.net/ubuntu/+source/linux-aws-5.11) –  [5.11.0-1020.21~20.04.2](https://launchpad.net/ubuntu/+source/linux-aws-5.11/5.11.0-1020.21~20.04.2) | | | | [linux-image-generic-lpae-hwe-20.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11) –  [5.11.0.38.42~20.04.17](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/5.11.0.38.42~20.04.17) | | | | [linux-image-5.11.0-38-generic](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11) –  [5.11.0-38.42~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11/5.11.0-38.42~20.04.1) | | | | [linux-image-generic-64k-hwe-20.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11) –  [5.11.0.38.42~20.04.17](https://launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/5.11.0.38.42~20.04.17) | | | | [linux-image-5.11.0-1020-oracle](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.11) –  [5.11.0-1020.21~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-oracle-5.11/5.11.0-1020.21~20.04.1) | | | | [linux-image-5.11.0-38-generic-64k](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11) –  [5.11.0-38.42~20.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe-5.11/5.11.0-38.42~20.04.1) | | | --- ### 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-2021-42008](https://ubuntu.com/security/CVE-2021-42008) * [CVE-2021-40490](https://ubuntu.com/security/CVE-2021-40490) * [CVE-2021-38166](https://ubuntu.com/security/CVE-2021-38166) * [CVE-2021-3753](https://ubuntu.com/security/CVE-2021-3753) * [CVE-2021-3743](https://ubuntu.com/security/CVE-2021-3743) * [CVE-2021-3739](https://ubuntu.com/security/CVE-2021-3739) * [CVE-2021-3732](https://ubuntu.com/security/CVE-2021-3732) * [CVE-2020-3702](https://ubuntu.com/security/CVE-2020-3702) ## Related notices * [USN-6221-1](https://ubuntu.com/security/notices/USN-6221-1) * [USN-6014-1](https://ubuntu.com/security/notices/USN-6014-1) * [USN-6013-1](https://ubuntu.com/security/notices/USN-6013-1) * [USN-6001-1](https://ubuntu.com/security/notices/USN-6001-1) * [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-5137-1](https://ubuntu.com/security/notices/USN-5137-1) * [USN-5137-2](https://ubuntu.com/security/notices/USN-5137-2) * [USN-5136-1](https://ubuntu.com/security/notices/USN-5136-1) --- Show 9 more references --- Have additional questions? 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