========================================================================== Ubuntu Security Notice USN-6254-1 July 26, 2023 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS (Available with Ubuntu Pro) - Ubuntu 14.04 LTS (Available with Ubuntu Pro) 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-kvm: Linux kernel for cloud environments - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: Jordy Zomer and Alexandra Sandulescu discovered that syscalls invoking the do_prlimit() function in the Linux kernel did not properly handle speculative execution barriers. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2023-0458) It was discovered that a race condition existed in the btrfs file system implementation in 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 expose sensitive information. (CVE-2023-1611) It was discovered that the XFS file system implementation in the Linux kernel did not properly perform metadata validation when mounting certain images. An attacker could use this to specially craft a file system image that, when mounted, could cause a denial of service (system crash). (CVE-2023-2124) It was discovered that a use-after-free vulnerability existed in the iSCSI TCP implementation in the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2023-2162) It was discovered that the ext4 file system implementation in the Linux kernel did not properly handle extra inode size for extended attributes, leading to a use-after-free vulnerability. A privileged attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-2513) It was discovered that the IP-VLAN network driver for the Linux kernel did not properly initialize memory in some situations, leading to an out-of- bounds write vulnerability. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-3090) It was discovered that the Ricoh R5C592 MemoryStick card reader driver in the Linux kernel contained a race condition during module unload, 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-2023-3141) It was discovered that a use-after-free vulnerability existed in the IEEE 1394 (Firewire) implementation in the Linux kernel. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-3159) Sanan Hasanov discovered that the framebuffer console driver in the Linux kernel did not properly perform checks for font dimension limits. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-3161) It was discovered that the kernel->user space relay implementation in the Linux kernel did not properly perform certain buffer calculations, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information (kernel memory). (CVE-2023-3268) It was discovered that the netfilter subsystem in the Linux kernel did not properly handle some 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-2023-3390) Tanguy Dubroca discovered that the netfilter subsystem in the Linux kernel did not properly handle certain pointer data type, leading to an out-of- bounds write vulnerability. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-35001) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS (Available with Ubuntu Pro): linux-image-4.4.0-1122-kvm 4.4.0-1122.132 linux-image-4.4.0-1159-aws 4.4.0-1159.174 linux-image-4.4.0-243-generic 4.4.0-243.277 linux-image-4.4.0-243-lowlatency 4.4.0-243.277 linux-image-aws 4.4.0.1159.163 linux-image-generic 4.4.0.243.249 linux-image-generic-lts-xenial 4.4.0.243.249 linux-image-kvm 4.4.0.1122.119 linux-image-lowlatency 4.4.0.243.249 linux-image-lowlatency-lts-xenial 4.4.0.243.249 linux-image-virtual 4.4.0.243.249 linux-image-virtual-lts-xenial 4.4.0.243.249 Ubuntu 14.04 LTS (Available with Ubuntu Pro): linux-image-4.4.0-1121-aws 4.4.0-1121.127 linux-image-4.4.0-243-generic 4.4.0-243.277~14.04.1 linux-image-4.4.0-243-lowlatency 4.4.0-243.277~14.04.1 linux-image-aws 4.4.0.1121.118 linux-image-generic-lts-xenial 4.4.0.243.211 linux-image-lowlatency-lts-xenial 4.4.0.243.211 linux-image-virtual-lts-xenial 4.4.0.243.211 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-6254-1 CVE-2023-0458, CVE-2023-1611, CVE-2023-2124, CVE-2023-2162, CVE-2023-2513, CVE-2023-3090, CVE-2023-3141, CVE-2023-3159, CVE-2023-3161, CVE-2023-3268, CVE-2023-3390, CVE-2023-35001