Stay Secure with the Latest Linux Advisories

security advisoryubuntusystem crash

Ubuntu 18.04 LTS USN-4979-1 Critical Denial of Service Issues

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-4979-1 June 03, 2021 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-snapdragon vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 ESM - Ubuntu 14.04 ESM 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-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel Details: Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25670) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to causea denial of service. (CVE-2020-25673) It was discovered that the Realtek RTL8188EU Wireless device driver in the Linux kernel did not properly validate ssid lengths in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-28660) Zygo Blaxell discovered that the btrfs file system implementation in the Linux kernel contained a race condition during certain cloning operations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-28964) Vince Weaver discovered that the perf subsystem in the Linux kernel did not properly handle certain PEBS records properly for some Intel Haswell processors. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-28971) It was discovered that the RPA PCI Hotplug driver implementation in the Linux kernel did not properly handle device name writes via sysfs, leading to a buffer overflow. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28972) It was discovered that the Qualcomm IPC router implementation in the Linux kernel did not properly initialize memory passed to user space. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-29647) Dan Carpenter discovered that the block device manager (dm) implementation in the Linux kernel contained a buffer overflow in the ioctl for listing devices. A privileged local attacker could use this to cause a denial of service (system crash). (CVE-2021-31916) It was discovered that the CIPSO implementation in the Linux kernel did not properly perform reference counting in some situations, leading to use-after-free vulnerabilities. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33033) Wolfgang Frisch discovered that the ext4 file system implementation in the Linux kernel contained an integer overflow whenhandling 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) 马哲宇 discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver 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-2021-3483) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1072-oracle 4.15.0-1072.80 linux-image-4.15.0-1092-kvm 4.15.0-1092.94 linux-image-4.15.0-1100-gcp 4.15.0-1100.113 linux-image-4.15.0-1103-aws 4.15.0-1103.110 linux-image-4.15.0-1103-snapdragon 4.15.0-1103.112 linux-image-4.15.0-1115-azure 4.15.0-1115.128 linux-image-4.15.0-144-generic 4.15.0-144.148 linux-image-4.15.0-144-generic-lpae 4.15.0-144.148 linux-image-4.15.0-144-lowlatency 4.15.0-144.148 linux-image-aws-lts-18.04 4.15.0.1103.106 linux-image-azure-lts-18.04 4.15.0.1115.88 linux-image-gcp-lts-18.04 4.15.0.1100.118 linux-image-generic 4.15.0.144.131 linux-image-generic-lpae 4.15.0.144.131 linux-image-kvm 4.15.0.1092.88 linux-image-lowlatency 4.15.0.144.131 linux-image-oracle-lts-18.04 4.15.0.1072.82 linux-image-snapdragon 4.15.0.1103.106 linux-image-virtual 4.15.0.144.131 Ubuntu 16.04 ESM: linux-image-4.15.0-1072-oracle 4.15.0-1072.80~16.04.1 linux-image-4.15.0-1100-gcp 4.15.0-1100.113~16.04.1 linux-image-4.15.0-1103-aws 4.15.0-1103.110~16.04.1 linux-image-4.15.0-1115-azure 4.15.0-1115.128~16.04.1 linux-image-4.15.0-144-generic 4.15.0-144.148~16.04.1 linux-image-4.15.0-144-lowlatency 4.15.0-144.148~16.04.1 linux-image-aws-hwe 4.15.0.1103.94 linux-image-azure 4.15.0.1115.106 linux-image-gcp 4.15.0.1100.101 linux-image-generic-hwe-16.04 4.15.0.144.140 linux-image-gke 4.15.0.1100.101 linux-image-lowlatency-hwe-16.04 4.15.0.144.140 linux-image-oem 4.15.0.144.140 linux-image-oracle 4.15.0.1072.60 linux-image-virtual-hwe-16.04 4.15.0.144.140 Ubuntu 14.04 ESM: linux-image-4.15.0-1115-azure 4.15.0-1115.128~14.04.1 linux-image-azure 4.15.0.1115.88 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-4979-1 CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2020-25673, CVE-2021-28660, CVE-2021-28964, CVE-2021-28971, CVE-2021-28972, CVE-2021-29647, CVE-2021-31916, CVE-2021-33033, CVE-2021-3428, CVE-2021-3483 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-144.148 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1103.110 https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1115.128 https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1100.113 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1092.94 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1072.80 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1103.112 . An urgent security update is issued for Ubuntu to fix critical Linux kernel vulnerabilities in cloud infrastructures, ensuring your systems remain secure. Ubuntu KernelAdvisory, Security Update Notices, Linux Kernel Security, Denial of Service Threats. . Severity: Critical. LinuxSecurity.com Team

Jun 02, 2021 •Critical Ubuntu