========================================================================== Ubuntu Security Notice USN-5565-1 August 10, 2022 linux, linux-hwe-5.15, linux-lowlatency, linux-lowlatency-hwe-5.15 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-lowlatency: Linux low latency kernel - linux-hwe-5.15: Linux hardware enablement (HWE) kernel - linux-lowlatency-hwe-5.15: Linux low latency kernel Details: Zhenpeng Lin discovered that the network packet scheduler implementation in the Linux kernel did not properly remove all references to a route filter before freeing it in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-2588) It was discovered that the netfilter subsystem of the Linux kernel did not prevent one nft object from referencing an nft set in another nft table, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-2586) It was discovered that the implementation of POSIX timers in the Linux kernel did not properly clean up timers in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-2585) Johannes Wikner and Kaveh Razavi discovered that for some AMD x86-64 processors, the branch predictor could by mis-trained for return instructions in certain circumstances. A local attacker could possibly use this to expose sensitive information. (CVE-2022-29900) Johannes Wikner and Kaveh Razavi discovered that for some Intel x86-64 processors, the Linux kernel's protections against speculative branch target injection attacks were insufficient in some circumstances. A local attacker could possibly use this to expose sensitive information. (CVE-2022-29901) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS: linux-image-5.15.0-46-generic 5.15.0-46.49 linux-image-5.15.0-46-generic-64k 5.15.0-46.49 linux-image-5.15.0-46-generic-lpae 5.15.0-46.49 linux-image-5.15.0-46-lowlatency 5.15.0-46.49 linux-image-5.15.0-46-lowlatency-64k 5.15.0-46.49 linux-image-generic 5.15.0.46.46 linux-image-generic-64k 5.15.0.46.46 linux-image-generic-64k-hwe-22.04 5.15.0.46.46 linux-image-generic-hwe-22.04 5.15.0.46.46 linux-image-generic-lpae 5.15.0.46.46 linux-image-generic-lpae-hwe-22.04 5.15.0.46.46 linux-image-lowlatency 5.15.0.46.43 linux-image-lowlatency-64k 5.15.0.46.43 linux-image-lowlatency-64k-hwe-22.04 5.15.0.46.43 linux-image-lowlatency-hwe-22.04 5.15.0.46.43 linux-image-virtual 5.15.0.46.46 linux-image-virtual-hwe-22.04 5.15.0.46.46 Ubuntu 20.04 LTS: linux-image-5.15.0-46-generic 5.15.0-46.49~20.04.1 linux-image-5.15.0-46-generic-64k 5.15.0-46.49~20.04.1 linux-image-5.15.0-46-generic-lpae 5.15.0-46.49~20.04.1 linux-image-5.15.0-46-lowlatency 5.15.0-46.49~20.04.1 linux-image-5.15.0-46-lowlatency-64k 5.15.0-46.49~20.04.1 linux-image-generic-64k-hwe-20.04 5.15.0.46.49~20.04.16 linux-image-generic-hwe-20.04 5.15.0.46.49~20.04.16 linux-image-generic-lpae-hwe-20.04 5.15.0.46.49~20.04.16 linux-image-lowlatency-64k-hwe-20.04 5.15.0.46.49~20.04.15 linux-image-lowlatency-hwe-20.04 5.15.0.46.49~20.04.15 linux-image-virtual-hwe-20.04 5.15.0.46.49~20.04.16 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-5565-1 CVE-2022-2585, CVE-2022-2586, CVE-2022-2588, CVE-2022-29900, CVE-2022-29901 Package Information: https://launchpad.net/ubuntu/+source/linux/5.15.0-46.49 https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-46.49 https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-46.49~20.04.1 https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-46.49~20.04.1