--- title: 'USN-6651-2: 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-6651-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-6651-2 --- # USN-6651-2: Linux kernel vulnerabilities Publication date 28 February 2024 Overview Several security issues were fixed in the Linux kernel. Releases [23.10](https://ubuntu.com/security/notices?release=mantic) [22.04 LTS](https://ubuntu.com/security/notices?release=jammy) --- Open side navigation ## Packages * [linux-lowlatency](https://ubuntu.com/security/cves?package=linux-lowlatency) - Linux low latency kernel * [linux-lowlatency-hwe-6.5](https://ubuntu.com/security/cves?package=linux-lowlatency-hwe-6.5) - Linux low latency kernel * [linux-oem-6.5](https://ubuntu.com/security/cves?package=linux-oem-6.5) - Linux kernel for OEM systems ## Details It was discovered that a race condition existed in the ATM (Asynchronous Transfer Mode) 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-2023-51780](https://ubuntu.com/security/CVE-2023-51780)) It was discovered that a race condition existed in the AppleTalk networking 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-2023-51781](https://ubuntu.com/security/CVE-2023-51781)) Zhenghan Wang discovered that the generic ID allocator implementation in the Linux kernel did not properly check for null bitmap when releasing IDs. A local attacker could use this to cause a denial of service (system crash). ([CVE-2023-6915](https://ubuntu.com/security/CVE-2023-6915)) Robert... --- 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 | | --- | --- | | 23.10 mantic | [linux-image-6.5.0-21-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency) –  [6.5.0-21.21.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency/6.5.0-21.21.1) | | | | [linux-image-6.5.0-21-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency) –  [6.5.0-21.21.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency/6.5.0-21.21.1) | | | | [linux-image-lowlatency](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.5.0.21.21.15](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.5.0.21.21.15) | | | | [linux-image-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.5.0.21.21.15](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.5.0.21.21.15) | | | | 22.04 LTS jammy | [linux-image-6.5.0-1015-oem](https://launchpad.net/ubuntu/+source/linux-signed-oem-6.5) –  [6.5.0-1015.16](https://launchpad.net/ubuntu/+source/linux-signed-oem-6.5/6.5.0-1015.16) | | | | [linux-image-6.5.0-21-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.5) –  [6.5.0-21.21.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.5/6.5.0-21.21.1~22.04.1) | | | | [linux-image-6.5.0-21-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.5) –  [6.5.0-21.21.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.5/6.5.0-21.21.1~22.04.1) | | | | [linux-image-lowlatency-64k-hwe-22.04](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.5) –  [6.5.0.21.21.1~22.04.7](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.5/6.5.0.21.21.1~22.04.7) | | | | [linux-image-lowlatency-hwe-22.04](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.5) –  [6.5.0.21.21.1~22.04.7](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.5/6.5.0.21.21.1~22.04.7) | | | | [linux-image-oem-22.04d](https://launchpad.net/ubuntu/+source/linux-meta-oem-6.5) –  [6.5.0.1015.17](https://launchpad.net/ubuntu/+source/linux-meta-oem-6.5/6.5.0.1015.17) | | | --- ### 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-2024-0646](https://ubuntu.com/security/CVE-2024-0646) * [CVE-2024-0582](https://ubuntu.com/security/CVE-2024-0582) * [CVE-2024-0565](https://ubuntu.com/security/CVE-2024-0565) * [CVE-2023-6915](https://ubuntu.com/security/CVE-2023-6915) * [CVE-2023-51781](https://ubuntu.com/security/CVE-2023-51781) * [CVE-2023-51780](https://ubuntu.com/security/CVE-2023-51780) ## Related notices * [USN-6740-1](https://ubuntu.com/security/notices/USN-6740-1) * [USN-6716-1](https://ubuntu.com/security/notices/USN-6716-1) * [USN-6701-1](https://ubuntu.com/security/notices/USN-6701-1) * [USN-6701-2](https://ubuntu.com/security/notices/USN-6701-2) * [USN-6701-3](https://ubuntu.com/security/notices/USN-6701-3) * [USN-6701-4](https://ubuntu.com/security/notices/USN-6701-4) * [USN-6700-1](https://ubuntu.com/security/notices/USN-6700-1) * [USN-6700-2](https://ubuntu.com/security/notices/USN-6700-2) * [USN-6681-1](https://ubuntu.com/security/notices/USN-6681-1) * [USN-6681-2](https://ubuntu.com/security/notices/USN-6681-2) --- Show 20 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)