--- title: 'USN-4912-1: Linux kernel (OEM) 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-4912-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4912-1 --- # USN-4912-1: Linux kernel (OEM) vulnerabilities Publication date 13 April 2021 Overview Several security issues were fixed in the Linux kernel. Releases [20.04 LTS](https://ubuntu.com/security/notices?release=focal) --- Open side navigation ## Packages * [linux-oem-5.6](https://ubuntu.com/security/cves?package=linux-oem-5.6) - Linux kernel for OEM systems ## Details Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. ([CVE-2021-29154](https://ubuntu.com/security/CVE-2021-29154)) It was discovered that a race condition existed in the binder IPC implementation in 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-2020-0423](https://ubuntu.com/security/CVE-2020-0423)) It was discovered that the HID multitouch implementation within the Linux kernel did not properly validate input events in some situations. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. ( --- 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-5.6.0-1053-oem](https://launchpad.net/ubuntu/+source/linux-signed-oem-5.6) –  [5.6.0-1053.57](https://launchpad.net/ubuntu/+source/linux-signed-oem-5.6/5.6.0-1053.57) | | | | [linux-image-oem-20.04](https://launchpad.net/ubuntu/+source/linux-meta-oem-5.6) –  [5.6.0.1053.49](https://launchpad.net/ubuntu/+source/linux-meta-oem-5.6/5.6.0.1053.49) | | | --- ### 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-2021-3411](https://ubuntu.com/security/CVE-2021-3411) * [CVE-2021-3178](https://ubuntu.com/security/CVE-2021-3178) * [CVE-2021-29154](https://ubuntu.com/security/CVE-2021-29154) * [CVE-2021-20194](https://ubuntu.com/security/CVE-2021-20194) * [CVE-2020-36158](https://ubuntu.com/security/CVE-2020-36158) * [CVE-2020-27830](https://ubuntu.com/security/CVE-2020-27830) * [CVE-2020-25669](https://ubuntu.com/security/CVE-2020-25669) * [CVE-2020-25645](https://ubuntu.com/security/CVE-2020-25645) * [CVE-2020-25285](https://ubuntu.com/security/CVE-2020-25285) * [CVE-2020-14390](https://ubuntu.com/security/CVE-2020-14390) --- Show 4 more references ## Related notices * [USN-4917-1](https://ubuntu.com/security/notices/USN-4917-1) * [USN-4916-1](https://ubuntu.com/security/notices/USN-4916-1) * [USN-4910-1](https://ubuntu.com/security/notices/USN-4910-1) * [USN-4909-1](https://ubuntu.com/security/notices/USN-4909-1) * [USN-4884-1](https://ubuntu.com/security/notices/USN-4884-1) * [USN-4879-1](https://ubuntu.com/security/notices/USN-4879-1) * [USN-4878-1](https://ubuntu.com/security/notices/USN-4878-1) * [USN-4877-1](https://ubuntu.com/security/notices/USN-4877-1) * [USN-4876-1](https://ubuntu.com/security/notices/USN-4876-1) * [USN-4751-1](https://ubuntu.com/security/notices/USN-4751-1) --- Show 13 more references --- Have additional questions? [Talk to a member of the team ›](https://wiki.ubuntu.com/SecurityTeam/FAQ?_ga=2.242131138.1744859116.1742138161-1500419473.1726851136&_gl=1*161muja*_gcl_au*MzUyMTIzNjI1LjE3MzYyNDQ4NTE.#Contact)