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Ubuntu 20.04: USN-5137-2 Moderate: Kernel Denial of Service Threat

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-5137-2 November 11, 2021 linux-bluefield, linux-gke-5.4, linux-oracle, linux-oracle-5.4 vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-bluefield: Linux kernel for NVIDIA BlueField platforms - linux-oracle: Linux kernel for Oracle Cloud systems - linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems - linux-oracle-5.4: Linux kernel for Oracle Cloud systems Details: It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-19449) It was discovered that the Infiniband RDMA userspace connection manager implementation in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possible execute arbitrary code. (CVE-2020-36385) Wolfgang Frisch discovered that the ext4 file system implementation in the Linux kernel contained an integer overflow when handling metadata inode extents. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service (system crash). (CVE-2021-3428) Benedict Schlueter discovered that the BPF subsystem in the Linux kernel did not properly protect against Speculative Store Bypass (SSB) side- channel attacks in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2021-34556) Piotr Krysiuk discovered that the BPFsubsystem in the Linux kernel did not properly protect against Speculative Store Bypass (SSB) side-channel attacks in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2021-35477) It was discovered that the btrfs file system in the Linux kernel did not properly handle removing a non-existent device id. An attacker with CAP_SYS_ADMIN could use this to cause a denial of service. (CVE-2021-3739) It was discovered that the Qualcomm IPC Router protocol implementation in the Linux kernel did not properly validate metadata in some situations. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2021-3743) It was discovered that the virtual terminal (vt) device implementation in the Linux kernel contained a race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker could possibly use this to expose sensitive information. (CVE-2021-3753) It was discovered that the Linux kernel did not properly account for the memory usage of certain IPC objects. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3759) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1021-bluefield 5.4.0-1021.24 linux-image-5.4.0-1057-oracle 5.4.0-1057.61 linux-image-bluefield 5.4.0.1021.22 linux-image-oracle-lts-20.04 5.4.0.1057.57 Ubuntu 18.04 LTS: linux-image-5.4.0-1055-gke 5.4.0-1055.58~18.04.1 linux-image-5.4.0-1057-oracle 5.4.0-1057.61~18.04.1 linux-image-gke-5.4 5.4.0.1055.58~18.04.20 linux-image-oracle 5.4.0.1057.61~18.04.37 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 kernelmodules 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-5137-2 https://ubuntu.com/security/notices/USN-5137-1 CVE-2019-19449, CVE-2020-36385, CVE-2021-3428, CVE-2021-34556, CVE-2021-35477, CVE-2021-3739, CVE-2021-3743, CVE-2021-3753, CVE-2021-3759 Package Information: https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1021.24 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1057.61 https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1055.58~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1057.61~18.04.1 . Numerous security enhancements have been released for Ubuntu's kernel aimed at addressing vulnerabilities that could compromise system performance and safeguard sensitive information.. Ubuntu Kernel Updates, Linux Security Issues, Denial of Service Risks, Linux Systems Maintenance. . LinuxSecurity.com Team

Nov 11, 2021 Ubuntu