========================================================================== Ubuntu Security Notice USN-6318-1 August 29, 2023 linux, linux-aws, linux-aws-6.2, linux-azure, linux-hwe-6.2, linux-ibm, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-6.2, linux-raspi vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.04 - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-ibm: Linux kernel for IBM cloud systems - linux-kvm: Linux kernel for cloud environments - linux-lowlatency: Linux low latency kernel - linux-raspi: Linux kernel for Raspberry Pi systems - linux-aws-6.2: Linux kernel for Amazon Web Services (AWS) systems - linux-hwe-6.2: Linux hardware enablement (HWE) kernel - linux-lowlatency-hwe-6.2: Linux low latency kernel Details: Daniel Moghimi discovered that some Intel(R) Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. (CVE-2022-40982) Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information. (CVE-2023-20593) It was discovered that the universal 32bit network packet classifier implementation in the Linux kernel did not properly perform reference counting in some situations, 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-2023-3609) It was discovered that the netfilter subsystem in the Linux kernel did not properly handle certain error 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-2023-3610) It was discovered that the Quick Fair Queueing network scheduler implementation in the Linux kernel contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-3611) It was discovered that the network packet classifier with netfilter/firewall marks implementation in the Linux kernel did not properly handle reference counting, 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-2023-3776) Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle table rules flush in certain circumstances. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2023-3777) Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle rule additions to bound chains in certain circumstances. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2023-3995) It was discovered that the netfilter subsystem in the Linux kernel did not properly handle PIPAPO element removal, 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-2023-4004) Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle bound chain deactivation in certain circumstances. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2023-4015) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 23.04: linux-image-6.2.0-1008-ibm 6.2.0-1008.8 linux-image-6.2.0-1010-aws 6.2.0-1010.10 linux-image-6.2.0-1010-azure 6.2.0-1010.10 linux-image-6.2.0-1011-kvm 6.2.0-1011.11 linux-image-6.2.0-1011-lowlatency 6.2.0-1011.11 linux-image-6.2.0-1011-lowlatency-64k 6.2.0-1011.11 linux-image-6.2.0-1011-raspi 6.2.0-1011.13 linux-image-6.2.0-31-generic 6.2.0-31.31 linux-image-6.2.0-31-generic-64k 6.2.0-31.31 linux-image-6.2.0-31-generic-lpae 6.2.0-31.31 linux-image-aws 6.2.0.1010.11 linux-image-azure 6.2.0.1010.10 linux-image-generic 6.2.0.31.29 linux-image-generic-64k 6.2.0.31.29 linux-image-generic-lpae 6.2.0.31.29 linux-image-ibm 6.2.0.1008.8 linux-image-kvm 6.2.0.1011.11 linux-image-lowlatency 6.2.0.1011.11 linux-image-lowlatency-64k 6.2.0.1011.11 linux-image-raspi 6.2.0.1011.14 linux-image-raspi-nolpae 6.2.0.1011.14 linux-image-virtual 6.2.0.31.29 Ubuntu 22.04 LTS: linux-image-6.2.0-1010-aws 6.2.0-1010.10~22.04.1 linux-image-6.2.0-1011-lowlatency 6.2.0-1011.11~22.04.1 linux-image-6.2.0-1011-lowlatency-64k 6.2.0-1011.11~22.04.1 linux-image-6.2.0-31-generic 6.2.0-31.31~22.04.1 linux-image-6.2.0-31-generic-64k 6.2.0-31.31~22.04.1 linux-image-6.2.0-31-generic-lpae 6.2.0-31.31~22.04.1 linux-image-aws 6.2.0.1010.10~22.04.1 linux-image-generic-64k-hwe-22.04 6.2.0.31.31~22.04.8 linux-image-generic-hwe-22.04 6.2.0.31.31~22.04.8 linux-image-generic-lpae-hwe-22.04 6.2.0.31.31~22.04.8 linux-image-lowlatency-64k-hwe-22.04 6.2.0.1011.11~22.04.8 linux-image-lowlatency-hwe-22.04 6.2.0.1011.11~22.04.8 linux-image-virtual-hwe-22.04 6.2.0.31.31~22.04.8 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-6318-1 CVE-2022-40982, CVE-2023-20593, CVE-2023-3609, CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-3777, CVE-2023-3995, CVE-2023-4004, CVE-2023-4015 Package Information: https://launchpad.net/ubuntu/+source/linux/6.2.0-31.31 https://launchpad.net/ubuntu/+source/linux-aws/6.2.0-1010.10 https://launchpad.net/ubuntu/+source/linux-azure/6.2.0-1010.10 https://launchpad.net/ubuntu/+source/linux-ibm/6.2.0-1008.8 https://launchpad.net/ubuntu/+source/linux-kvm/6.2.0-1011.11 https://launchpad.net/ubuntu/+source/linux-lowlatency/6.2.0-1011.11 https://launchpad.net/ubuntu/+source/linux-raspi/6.2.0-1011.13 https://launchpad.net/ubuntu/+source/linux-aws-6.2/6.2.0-1010.10~22.04.1 https://launchpad.net/ubuntu/+source/linux-hwe-6.2/6.2.0-31.31~22.04.1 https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.2/6.2.0-1011.11~22.04.1