[USN-4945-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-4945-1 May 11, 2021
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, 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: 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-gke: Linux kernel for Google Container Engine (GKE) 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-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
Details:
It was discovered that the Nouveau GPU driver in the Linux kernel did not properly handle error conditions in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25639)
Jan Beulich discovered that the Xen netback backend in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-28038)
It was discovered that the fastrpc driver in the Linux kernel did not prevent user space applications from sending kernel RPC messages. A local attacker could possibly use this to gain elevated privileges. (CVE-2021-28375)
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)
It was discovered that the USB/IP driver in the Linux kernel contained race conditions during the update of local and shared status. An attacker could use this to cause a denial of service (system crash). (CVE-2021-29265)
It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when replacing tables. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-29650)
Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-30002)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.4.0-1015-gkeop 5.4.0-1015.16 linux-image-5.4.0-1039-kvm 5.4.0-1039.40 linux-image-5.4.0-1043-gcp 5.4.0-1043.46 linux-image-5.4.0-1043-gke 5.4.0-1043.45 linux-image-5.4.0-1045-oracle 5.4.0-1045.49+1 linux-image-5.4.0-1047-azure 5.4.0-1047.49 linux-image-5.4.0-1048-aws 5.4.0-1048.50 linux-image-5.4.0-73-generic 5.4.0-73.82 linux-image-5.4.0-73-generic-lpae 5.4.0-73.82 linux-image-5.4.0-73-lowlatency 5.4.0-73.82 linux-image-aws 5.4.0.1048.49 linux-image-azure 5.4.0.1047.45 linux-image-gcp 5.4.0.1043.52 linux-image-generic 5.4.0.73.76 linux-image-generic-lpae 5.4.0.73.76 linux-image-gke 5.4.0.1043.52 linux-image-gke-5.4 5.4.0.1043.52 linux-image-gkeop 5.4.0.1015.18 linux-image-gkeop-5.4 5.4.0.1015.18 linux-image-kvm 5.4.0.1039.37 linux-image-lowlatency 5.4.0.73.76 linux-image-oem 5.4.0.73.76 linux-image-oem-osp1 5.4.0.73.76 linux-image-oracle 5.4.0.1045.44 linux-image-virtual 5.4.0.73.76
Ubuntu 18.04 LTS: linux-image-5.4.0-1015-gkeop 5.4.0-1015.16~18.04.1 linux-image-5.4.0-1043-gcp 5.4.0-1043.46~18.04.1 linux-image-5.4.0-1043-gke 5.4.0-1043.45~18.04.1 linux-image-5.4.0-1044-oracle 5.4.0-1044.47~18.04.1 linux-image-5.4.0-1047-azure 5.4.0-1047.49~18.04.1 linux-image-5.4.0-1048-aws 5.4.0-1048.50~18.04.1 linux-image-5.4.0-73-generic 5.4.0-73.82~18.04.1 linux-image-5.4.0-73-generic-lpae 5.4.0-73.82~18.04.1 linux-image-5.4.0-73-lowlatency 5.4.0-73.82~18.04.1 linux-image-aws 5.4.0.1048.30 linux-image-azure 5.4.0.1047.26 linux-image-gcp 5.4.0.1043.30 linux-image-generic-hwe-18.04 5.4.0.73.82~18.04.66 linux-image-generic-lpae-hwe-18.04 5.4.0.73.82~18.04.66 linux-image-gke-5.4 5.4.0.1043.45~18.04.9 linux-image-gkeop-5.4 5.4.0.1015.16~18.04.16 linux-image-lowlatency-hwe-18.04 5.4.0.73.82~18.04.66 linux-image-oem 5.4.0.73.82~18.04.66 linux-image-oem-osp1 5.4.0.73.82~18.04.66 linux-image-oracle 5.4.0.1044.47~18.04.26 linux-image-snapdragon-hwe-18.04 5.4.0.73.82~18.04.66 linux-image-virtual-hwe-18.04 5.4.0.73.82~18.04.66
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-4945-1 CVE-2020-25639, CVE-2021-28038, CVE-2021-28375, CVE-2021-28660, CVE-2021-29265, CVE-2021-29650, CVE-2021-30002
Package Information: launchpad.net/ubuntu/+source/linux/5.4.0-73.82 launchpad.net/ubuntu/+source/linux-aws/5.4.0-1048.50 launchpad.net/ubuntu/+source/linux-azure/5.4.0-1047.49 launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1043.46 launchpad.net/ubuntu/+source/linux-gke/5.4.0-1043.45 launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1015.16 launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1039.40 launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1045.49 launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1048.50~18.04.1 launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1047.49~18.04.1 launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1043.46~18.04.1 launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1043.45~18.04.1 launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1015.16~18.04.1 launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-73.82~18.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1044.47~18.04.1