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Ubuntu 22.04 LTS USN-6479-1 Critical: Linux Kernel Denial of Service

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-6479-1 November 14, 2023 linux-oem-6.5 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-oem-6.5: Linux kernel for OEM systems 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 22.04 LTS: linux-image-6.5.0-1007-oem 6.5.0-1007.7 linux-image-oem-22.04d 6.5.0.1007.9 After a standard system update you need to reboot your computer to make allthe 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-6479-1 CVE-2023-42756, CVE-2023-4881, CVE-2023-4921, CVE-2023-5197 Package Information: https://launchpad.net/ubuntu/+source/linux-oem-6.5/6.5.0-1007.7 . Tackling essential kernel weaknesses in Ubuntu 22.04 LTS through requisite patches and enhancements.. Ubuntu Kernel Fixes, Linux Kernel Security, System Update, Denial of Service, Security Advisory. . Severity: Critical. LinuxSecurity.com Team

Nov 14, 2023 •Critical Ubuntu