========================================================================== Ubuntu Security Notice USN-6454-1 October 26, 2023
linux, linux-lowlatency vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.10 Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-lowlatency: Linux low latency kernel Details: Kyle Zeng discovered that the netfilter subsystem in the Linux kernel contained a race condition in IP set operations in certain situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-42756) Alex Birnberg discovered that the netfilter subsystem in the Linux kernel did not properly validate register length, leading to an out-of- bounds write vulnerability. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2023-4881) It was discovered that the Quick Fair Queueing scheduler implementation in the Linux kernel did not properly handle network packets in certain conditions, 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-2023-4921) Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle removal of rules from chain bindings in certain circumstances, leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2023-5197) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 23.10: linux-image-6.5.0-10-generic 6.5.0-10.10 linux-image-6.5.0-10-generic-64k 6.5.0-10.10 linux-image-6.5.0-10-lowlatency 6.5.0-10.10.1 linux-image-6.5.0-10-lowlatency-64k 6.5.0-10.10.1 linux-image-generic 6.5.0.10.12 linux-image-generic-64k 6.5.0.10.12 linux-image-generic-lpae 6.5.0.10.12 linux-image-kvm 6.5.0.10.12 linux-image-lowlatency 6.5.0.10.10.10 linux-image-lowlatency-64k 6.5.0.10.10.10 linux-image-virtual 6.5.0.10.12 After a standard system update you need to reboot your computer to make all the necessary changes. 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. References: https://ubuntu.com/security/notices/USN-6454-1 CVE-2023-42756, CVE-2023-4881, CVE-2023-4921, CVE-2023-5197 Package Information: https://launchpad.net/ubuntu/+source/linux/6.5.0-10.10 https://launchpad.net/ubuntu/+source/linux-lowlatency/6.5.0-10.10.1
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