========================================================================== Ubuntu Security Notice USN-6416-2 October 06, 2023 linux-hwe-5.15, linux-oracle-5.15 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-hwe-5.15: Linux hardware enablement (HWE) kernel - linux-oracle-5.15: Linux kernel for Oracle Cloud systems Details: It was discovered that the IPv6 implementation in the Linux kernel contained a high rate of hash collisions in connection lookup table. A remote attacker could use this to cause a denial of service (excessive CPU consumption). (CVE-2023-1206) Daniël Trujillo, Johannes Wikner, and Kaveh Razavi discovered that some AMD processors utilising speculative execution and branch prediction may allow unauthorised memory reads via a speculative side-channel attack. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2023-20569) It was discovered that the IPv6 RPL protocol implementation in the Linux kernel did not properly handle user-supplied data. A remote attacker could use this to cause a denial of service (system crash). (CVE-2023-2156) Davide Ornaghi discovered that the DECnet network protocol implementation in the Linux kernel contained a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Please note that kernel support for the DECnet has been removed to resolve this CVE. (CVE-2023-3338) Chih-Yen Chang discovered that the KSMBD implementation in the Linux kernel did not properly validate command payload size, leading to a out-of-bounds read vulnerability. A remote attacker could possibly use this to cause a denial of service (system crash). (CVE-2023-38432) It was discovered that the NFC implementation in the Linux kernel contained a use-after-free vulnerability when performing peer-to-peer communication in certain conditions. A privileged attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2023-3863) Laurence Wit discovered that the KSMBD implementation in the Linux kernel did not properly validate a buffer size in certain situations, leading to an out-of-bounds read vulnerability. A remote attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2023-3865) Laurence Wit discovered that the KSMBD implementation in the Linux kernel contained a null pointer dereference vulnerability when handling handling chained requests. A remote attacker could use this to cause a denial of service (system crash). (CVE-2023-3866) It was discovered that the Siano USB MDTV receiver device driver in the Linux kernel did not properly handle device initialization failures in certain situations, leading to a use-after-free vulnerability. A physically proximate attacker could use this cause a denial of service (system crash). (CVE-2023-4132) Andy Nguyen discovered that the KVM implementation for AMD processors in the Linux kernel with Secure Encrypted Virtualization (SEV) contained a race condition when accessing the GHCB page. A local attacker in a SEV guest VM could possibly use this to cause a denial of service (host system crash). (CVE-2023-4155) It was discovered that the TUN/TAP driver in the Linux kernel did not properly initialize socket data. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-4194) Maxim Suhanov discovered that the exFAT file system implementation in the Linux kernel did not properly check a file name length, leading to an out- of-bounds write vulnerability. An attacker could use this to construct a malicious exFAT image that, when mounted and operated on, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4273) Thelford Williams discovered that the Ceph file system messenger protocol implementation in the Linux kernel did not properly validate frame segment length in certain situation, leading to a buffer overflow vulnerability. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-44466) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.15.0-1045-oracle 5.15.0-1045.51~20.04.1 linux-image-5.15.0-86-generic 5.15.0-86.96~20.04.1 linux-image-5.15.0-86-generic-64k 5.15.0-86.96~20.04.1 linux-image-5.15.0-86-generic-lpae 5.15.0-86.96~20.04.1 linux-image-generic-64k-hwe-20.04 5.15.0.86.96~20.04.44 linux-image-generic-hwe-20.04 5.15.0.86.96~20.04.44 linux-image-generic-lpae-hwe-20.04 5.15.0.86.96~20.04.44 linux-image-oem-20.04 5.15.0.86.96~20.04.44 linux-image-oem-20.04b 5.15.0.86.96~20.04.44 linux-image-oem-20.04c 5.15.0.86.96~20.04.44 linux-image-oem-20.04d 5.15.0.86.96~20.04.44 linux-image-oracle 5.15.0.1045.51~20.04.1 linux-image-virtual-hwe-20.04 5.15.0.86.96~20.04.44 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-6416-2 https://ubuntu.com/security/notices/USN-6416-1 CVE-2023-1206, CVE-2023-20569, CVE-2023-2156, CVE-2023-3338, CVE-2023-38432, CVE-2023-3863, CVE-2023-3865, CVE-2023-3866, CVE-2023-4132, CVE-2023-4155, CVE-2023-4194, CVE-2023-4273, CVE-2023-44466 Package Information: https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-86.96~20.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1045.51~20.04.1