[USN-4878-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-4878-1 March 16, 2021
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-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: Linux kernel – linux-aws: Linux kernel for Amazon Web Services (AWS) systems – linux-azure: Linux kernel for Microsoft Azure Cloud systems – linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems – linux-gkeop: Linux kernel for Google Container Engine (GKE) systems – linux-kvm: Linux kernel for cloud environments – linux-oracle: Linux kernel for Oracle Cloud systems – linux-raspi: Linux kernel for Raspberry Pi (V8) systems – linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems – linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems – linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems – linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems – linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems – linux-hwe-5.4: Linux hardware enablement (HWE) kernel – linux-oracle-5.4: Linux kernel for Oracle Cloud systems – linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems
Details:
It was discovered that the Marvell WiFi-Ex device driver in the Linux kernel did not properly validate ad-hoc SSIDs. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-36158)
Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could allow a user space program to probe for valid kernel addresses. A local attacker could use this to ease exploitation of another kernel vulnerability. (CVE-2021-20239)
It was discovered that the priority inheritance futex 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 possibly execute arbitrary code. (CVE-2021-3347)
吴异 discovered that the NFS implementation in the Linux kernel did not properly prevent access outside of an NFS export that is a subdirectory of a file system. An attacker could possibly use this to bypass NFS access restrictions. (CVE-2021-3178)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.4.0-1011-gkeop 5.4.0-1011.12 linux-image-5.4.0-1030-raspi 5.4.0-1030.33 linux-image-5.4.0-1034-kvm 5.4.0-1034.35 linux-image-5.4.0-1038-gcp 5.4.0-1038.41 linux-image-5.4.0-1039-aws 5.4.0-1039.41 linux-image-5.4.0-1039-oracle 5.4.0-1039.42 linux-image-5.4.0-1041-azure 5.4.0-1041.43 linux-image-5.4.0-67-generic 5.4.0-67.75 linux-image-5.4.0-67-generic-lpae 5.4.0-67.75 linux-image-5.4.0-67-lowlatency 5.4.0-67.75 linux-image-aws 5.4.0.1039.40 linux-image-azure 5.4.0.1041.39 linux-image-gcp 5.4.0.1038.47 linux-image-generic 5.4.0.67.70 linux-image-generic-lpae 5.4.0.67.70 linux-image-gkeop 5.4.0.1011.14 linux-image-gkeop-5.4 5.4.0.1011.14 linux-image-kvm 5.4.0.1034.32 linux-image-lowlatency 5.4.0.67.70 linux-image-oem 5.4.0.67.70 linux-image-oem-osp1 5.4.0.67.70 linux-image-oracle 5.4.0.1039.36 linux-image-raspi 5.4.0.1030.65 linux-image-raspi2 5.4.0.1030.65 linux-image-virtual 5.4.0.67.70
Ubuntu 18.04 LTS: linux-image-5.4.0-1011-gkeop 5.4.0-1011.12~18.04.2 linux-image-5.4.0-1030-raspi 5.4.0-1030.33~18.04.1 linux-image-5.4.0-1037-gke 5.4.0-1037.39~18.04.1 linux-image-5.4.0-1038-gcp 5.4.0-1038.41~18.04.1 linux-image-5.4.0-1039-aws 5.4.0-1039.41~18.04.1 linux-image-5.4.0-1039-oracle 5.4.0-1039.42~18.04.1 linux-image-5.4.0-1041-azure 5.4.0-1041.43~18.04.1 linux-image-5.4.0-67-generic 5.4.0-67.75~18.04.1 linux-image-5.4.0-67-generic-lpae 5.4.0-67.75~18.04.1 linux-image-5.4.0-67-lowlatency 5.4.0-67.75~18.04.1 linux-image-aws 5.4.0.1039.23 linux-image-aws-edge 5.4.0.1039.23 linux-image-azure 5.4.0.1041.21 linux-image-azure-edge 5.4.0.1041.21 linux-image-gcp 5.4.0.1038.25 linux-image-gcp-edge 5.4.0.1038.25 linux-image-generic-hwe-18.04 5.4.0.67.75~18.04.62 linux-image-generic-lpae-hwe-18.04 5.4.0.67.75~18.04.62 linux-image-gke-5.4 5.4.0.1037.39~18.04.5 linux-image-gkeop-5.4 5.4.0.1011.12~18.04.12 linux-image-lowlatency-hwe-18.04 5.4.0.67.75~18.04.62 linux-image-oem 5.4.0.67.75~18.04.62 linux-image-oem-osp1 5.4.0.67.75~18.04.62 linux-image-oracle 5.4.0.1039.42~18.04.22 linux-image-raspi-hwe-18.04 5.4.0.1030.33 linux-image-snapdragon-hwe-18.04 5.4.0.67.75~18.04.62 linux-image-virtual-hwe-18.04 5.4.0.67.75~18.04.62
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: ubuntu.com/security/notices/USN-4878-1 CVE-2020-36158, CVE-2021-20239, CVE-2021-3178, CVE-2021-3347
Package Information: launchpad.net/ubuntu/+source/linux/5.4.0-67.75 launchpad.net/ubuntu/+source/linux-aws/5.4.0-1039.41 launchpad.net/ubuntu/+source/linux-azure/5.4.0-1041.43 launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1038.41 launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1011.12 launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1034.35 launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1039.42 launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1030.33 launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1039.41~18.04.1 launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1041.43~18.04.1 launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1038.41~18.04.1 launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1037.39~18.04.1 launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1011.12~18.04.2 launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-67.75~18.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1039.42~18.04.1 launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1030.33~18.04.1