--- title: 'USN-6314-1: 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-6314-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-6314-1 --- # USN-6314-1: Linux kernel vulnerabilities Publication date 29 August 2023 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-bluefield](https://ubuntu.com/security/cves?package=linux-bluefield) - Linux kernel for NVIDIA BlueField platforms * [linux-ibm](https://ubuntu.com/security/cves?package=linux-ibm) - Linux kernel for IBM cloud systems ## Details It was discovered that the netlink implementation in the Linux kernel did not properly validate policies when parsing attributes in some situations. An attacker could use this to cause a denial of service (infinite recursion). ([CVE-2020-36691](https://ubuntu.com/security/CVE-2020-36691)) Billy Jheng Bing Jhong discovered that the CIFS network file system implementation in the Linux kernel did not properly validate arguments to ioctl() in some situations. A local attacker could possibly use this to cause a denial of service (system crash). ([CVE-2022-0168](https://ubuntu.com/security/CVE-2022-0168)) It was discovered that the ext4 file system implementation in the Linux kernel contained a use-after-free vulnerability. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service (system crash). ([CVE-2022-1184](https://ubuntu.com/security/CVE-2022-1184)) It was discovered that... --- 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-5.4.0-1054-ibm](https://launchpad.net/ubuntu/+source/linux-signed-ibm) –  [5.4.0-1054.59](https://launchpad.net/ubuntu/+source/linux-signed-ibm/5.4.0-1054.59) | | | | [linux-image-5.4.0-1068-bluefield](https://launchpad.net/ubuntu/+source/linux-signed-bluefield) –  [5.4.0-1068.74](https://launchpad.net/ubuntu/+source/linux-signed-bluefield/5.4.0-1068.74) | | | | [linux-image-bluefield](https://launchpad.net/ubuntu/+source/linux-meta-bluefield) –  [5.4.0.1068.63](https://launchpad.net/ubuntu/+source/linux-meta-bluefield/5.4.0.1068.63) | | | | [linux-image-ibm-lts-20.04](https://launchpad.net/ubuntu/+source/linux-meta-ibm) –  [5.4.0.1054.83](https://launchpad.net/ubuntu/+source/linux-meta-ibm/5.4.0.1054.83) | | | --- ### 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-2023-33203](https://ubuntu.com/security/CVE-2023-33203) * [CVE-2023-3141](https://ubuntu.com/security/CVE-2023-3141) * [CVE-2023-3111](https://ubuntu.com/security/CVE-2023-3111) * [CVE-2023-30772](https://ubuntu.com/security/CVE-2023-30772) * [CVE-2023-28466](https://ubuntu.com/security/CVE-2023-28466) * [CVE-2023-2194](https://ubuntu.com/security/CVE-2023-2194) * [CVE-2023-2124](https://ubuntu.com/security/CVE-2023-2124) * [CVE-2023-1990](https://ubuntu.com/security/CVE-2023-1990) * [CVE-2023-1855](https://ubuntu.com/security/CVE-2023-1855) * [CVE-2023-1611](https://ubuntu.com/security/CVE-2023-1611) --- Show 6 more references ## Related notices id="usn" *Search* * [USN-6396-1](https://ubuntu.com/security/notices/USN-6396-1) * [USN-6396-2](https://ubuntu.com/security/notices/USN-6396-2) * [USN-6396-3](https://ubuntu.com/security/notices/USN-6396-3) * [USN-6385-1](https://ubuntu.com/security/notices/USN-6385-1) * [USN-6347-1](https://ubuntu.com/security/notices/USN-6347-1) * [USN-6337-1](https://ubuntu.com/security/notices/USN-6337-1) * [USN-6332-1](https://ubuntu.com/security/notices/USN-6332-1) * [USN-6331-1](https://ubuntu.com/security/notices/USN-6331-1) * [USN-6312-1](https://ubuntu.com/security/notices/USN-6312-1) * [USN-6311-1](https://ubuntu.com/security/notices/USN-6311-1) --- Show 35 more references --- Have additional questions? 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