USN-4879-1: Linux kernel vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS

Packages

• 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-hwe-5.8 - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi - 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)

Loris Reiff discovered that the BPF implementation in the Linux kernel did
not properly validate attributes in the getsockopt BPF hook. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2021-20194)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10

• linux-image-5.8.0-1017-raspi - 5.8.0-1017.20
• linux-image-5.8.0-1017-raspi-nolpae - 5.8.0-1017.20
• linux-image-5.8.0-1020-kvm - 5.8.0-1020.22
• linux-image-5.8.0-1022-oracle - 5.8.0-1022.23
• linux-image-5.8.0-1024-azure - 5.8.0-1024.26
• linux-image-5.8.0-1024-gcp - 5.8.0-1024.25
• linux-image-5.8.0-1025-aws - 5.8.0-1025.27
• linux-image-5.8.0-45-generic - 5.8.0-45.51
• linux-image-5.8.0-45-generic-64k - 5.8.0-45.51
• linux-image-5.8.0-45-generic-lpae - 5.8.0-45.51
• linux-image-5.8.0-45-lowlatency - 5.8.0-45.51
• linux-image-aws - 5.8.0.1025.27
• linux-image-azure - 5.8.0.1024.24
• linux-image-gcp - 5.8.0.1024.24
• linux-image-generic - 5.8.0.45.50
• linux-image-generic-64k - 5.8.0.45.50
• linux-image-generic-lpae - 5.8.0.45.50
• linux-image-gke - 5.8.0.1024.24
• linux-image-kvm - 5.8.0.1020.22
• linux-image-lowlatency - 5.8.0.45.50
• linux-image-oem-20.04 - 5.8.0.45.50
• linux-image-oracle - 5.8.0.1022.21
• linux-image-raspi - 5.8.0.1017.20
• linux-image-raspi-nolpae - 5.8.0.1017.20
• linux-image-virtual - 5.8.0.45.50

Ubuntu 20.04

• linux-image-5.8.0-45-generic - 5.8.0-45.51~20.04.1
• linux-image-5.8.0-45-generic-64k - 5.8.0-45.51~20.04.1
• linux-image-5.8.0-45-generic-lpae - 5.8.0-45.51~20.04.1
• linux-image-5.8.0-45-lowlatency - 5.8.0-45.51~20.04.1
• linux-image-generic-64k-hwe-20.04 - 5.8.0.45.51~20.04.31
• linux-image-generic-hwe-20.04 - 5.8.0.45.51~20.04.31
• linux-image-generic-lpae-hwe-20.04 - 5.8.0.45.51~20.04.31
• linux-image-lowlatency-hwe-20.04 - 5.8.0.45.51~20.04.31
• linux-image-virtual-hwe-20.04 - 5.8.0.45.51~20.04.31

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

• CVE-2020-36158
• CVE-2021-20194

Related notices

• USN-4877-1: linux-image-lowlatency-hwe-16.04-edge, linux-image-oracle-lts-18.04, linux-image-gcp, linux-image-4.15.0-137-generic-lpae, linux-image-gcp-lts-18.04, linux-image-4.15.0-137-lowlatency, linux-snapdragon, linux-gcp-4.15, linux-image-gke, linux-image-4.15.0-1094-gcp, linux-image-4.15.0-1097-snapdragon, linux-dell300x, linux-image-4.15.0-1080-raspi2, linux-azure-4.15, linux-image-4.15.0-1095-aws, linux, linux-image-lowlatency, linux-image-4.15.0-137-generic, linux-image-azure, linux-image-4.15.0-1066-oracle, linux-image-virtual-hwe-16.04-edge, linux-image-azure-edge, linux-oracle, linux-image-generic, linux-image-dell300x, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1086-kvm, linux-image-aws-hwe, linux-image-generic-lpae, linux-image-oem, linux-image-generic-lpae-hwe-16.04, linux-azure, linux-image-snapdragon, linux-image-aws-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-raspi2, linux-image-azure-lts-18.04, linux-image-kvm, linux-gcp, linux-aws, linux-image-4.15.0-1013-dell300x, linux-image-generic-lpae-hwe-16.04-edge, linux-image-oracle, linux-hwe, linux-raspi2, linux-image-generic-hwe-16.04-edge, linux-image-virtual, linux-kvm, linux-image-4.15.0-1109-azure
• USN-4878-1: linux-image-gcp, linux-image-5.4.0-1039-aws, linux-aws-5.4, linux-image-5.4.0-67-generic, linux-image-snapdragon-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-1011-gkeop, linux, linux-image-lowlatency, linux-image-lowlatency-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-image-azure, linux-image-lowlatency-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-oracle, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1034-kvm, linux-image-gkeop, linux-image-5.4.0-1041-azure, linux-raspi, linux-image-generic-lpae, linux-image-oem, linux-azure, linux-image-5.4.0-1039-oracle, linux-image-gke-5.4, linux-gkeop-5.4, linux-image-aws-edge, linux-raspi-5.4, linux-image-aws, linux-image-5.4.0-1038-gcp, linux-image-raspi, linux-hwe-5.4, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-image-5.4.0-67-lowlatency, linux-image-raspi-hwe-18.04, linux-aws, linux-image-5.4.0-1037-gke, linux-gkeop, linux-image-generic-hwe-18.04, linux-gke-5.4, linux-oracle-5.4, linux-azure-5.4, linux-image-gkeop-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-oem-osp1, linux-image-oracle, linux-image-5.4.0-1030-raspi, linux-image-gcp-edge, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-generic-lpae-hwe-18.04-edge, linux-kvm, linux-gcp-5.4, linux-image-5.4.0-67-generic-lpae, linux-image-oracle-edge
• USN-4876-1: linux-image-generic-lts-utopic, linux-image-generic-lts-xenial, linux-snapdragon, linux-image-4.4.0-204-generic, linux-image-virtual-lts-wily, linux-image-4.4.0-1089-kvm, linux-image-generic-lts-vivid, linux-image-4.4.0-1087-aws, linux, linux-image-4.4.0-204-powerpc64-smp, linux-image-lowlatency, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-204-lowlatency, linux-image-powerpc-e500mc, linux-image-virtual-lts-utopic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-emb-lts-wily, linux-image-generic-lpae-lts-xenial, linux-kvm, linux-image-generic, linux-image-4.4.0-1123-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-204-generic-lpae, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1151-snapdragon, linux-image-generic-lpae, linux-image-powerpc-smp-lts-utopic, linux-image-snapdragon, linux-image-lowlatency-lts-wily, linux-image-4.4.0-204-powerpc-e500mc, linux-image-powerpc-e500mc-lts-vivid, linux-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-aws, linux-image-lowlatency-lts-utopic, linux-image-raspi2, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-kvm, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-aws, linux-image-powerpc64-smp, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-1147-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-smp, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-204-powerpc64-emb, linux-raspi2, linux-image-virtual, linux-image-virtual-lts-vivid, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-204-powerpc-smp, linux-image-powerpc64-smp-lts-utopic
• USN-4912-1: linux-oem-5.6, linux-image-5.6.0-1053-oem, linux-image-oem-20.04
• USN-4884-1: linux-image-oem-20.04-edge, linux-image-oem-20.04b, linux-image-5.10.0-1017-oem, linux-oem-5.10
• USN-4909-1: linux-image-5.4.0-1033-raspi, linux-image-gcp, linux-aws-5.4, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1042-oracle, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux, linux-image-lowlatency, linux-image-5.4.0-1040-gke, linux-image-lowlatency-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-image-azure, linux-image-lowlatency-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-oracle, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-gkeop, linux-image-5.4.0-1041-gcp, linux-image-5.4.0-1044-azure, linux-image-5.4.0-71-lowlatency, linux-image-generic-lpae, linux-image-oem, linux-raspi, linux-azure, linux-image-gke-5.4, linux-gkeop-5.4, linux-gcp-5.4, linux-image-aws-edge, linux-raspi-5.4, linux-image-aws, linux-image-raspi, linux-hwe-5.4, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-image-raspi-hwe-18.04, linux-aws, linux-image-5.4.0-71-generic, linux-gkeop, linux-image-generic-hwe-18.04, linux-gke-5.4, linux-oracle-5.4, linux-azure-5.4, linux-image-gkeop-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-oem-osp1, linux-image-oracle, linux-image-5.4.0-1043-aws, linux-image-5.4.0-1037-kvm, linux-image-5.4.0-71-generic-lpae, linux-image-gcp-edge, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-generic-lpae-hwe-18.04-edge, linux-kvm, linux-image-5.4.0-1013-gkeop, linux-image-oracle-edge