USN-4877-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
• linux-dell300x - Linux kernel for Dell 300x platforms
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
• linux-hwe - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

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)

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 18.04

• linux-image-4.15.0-1013-dell300x - 4.15.0-1013.17
• linux-image-4.15.0-1066-oracle - 4.15.0-1066.74
• linux-image-4.15.0-1080-raspi2 - 4.15.0-1080.85
• linux-image-4.15.0-1086-kvm - 4.15.0-1086.88
• linux-image-4.15.0-1094-gcp - 4.15.0-1094.107
• linux-image-4.15.0-1095-aws - 4.15.0-1095.102
• linux-image-4.15.0-1097-snapdragon - 4.15.0-1097.106
• linux-image-4.15.0-1109-azure - 4.15.0-1109.121
• linux-image-4.15.0-137-generic - 4.15.0-137.141
• linux-image-4.15.0-137-generic-lpae - 4.15.0-137.141
• linux-image-4.15.0-137-lowlatency - 4.15.0-137.141
• linux-image-aws-lts-18.04 - 4.15.0.1095.98
• linux-image-azure-lts-18.04 - 4.15.0.1109.82
• linux-image-dell300x - 4.15.0.1013.15
• linux-image-gcp-lts-18.04 - 4.15.0.1094.112
• linux-image-generic - 4.15.0.137.124
• linux-image-generic-lpae - 4.15.0.137.124
• linux-image-kvm - 4.15.0.1086.82
• linux-image-lowlatency - 4.15.0.137.124
• linux-image-oracle-lts-18.04 - 4.15.0.1066.76
• linux-image-raspi2 - 4.15.0.1080.77
• linux-image-snapdragon - 4.15.0.1097.100
• linux-image-virtual - 4.15.0.137.124

Ubuntu 16.04

• linux-image-4.15.0-1066-oracle - 4.15.0-1066.74~16.04.1
• linux-image-4.15.0-1094-gcp - 4.15.0-1094.107~16.04.1
• linux-image-4.15.0-1095-aws - 4.15.0-1095.102~16.04.1
• linux-image-4.15.0-1109-azure - 4.15.0-1109.121~16.04.1
• linux-image-4.15.0-137-generic - 4.15.0-137.141~16.04.1
• linux-image-4.15.0-137-generic-lpae - 4.15.0-137.141~16.04.1
• linux-image-4.15.0-137-lowlatency - 4.15.0-137.141~16.04.1
• linux-image-aws-hwe - 4.15.0.1095.88
• linux-image-azure - 4.15.0.1109.100
• linux-image-gcp - 4.15.0.1094.95
• linux-image-generic-hwe-16.04 - 4.15.0.137.133
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.137.133
• linux-image-gke - 4.15.0.1094.95
• linux-image-lowlatency-hwe-16.04 - 4.15.0.137.133
• linux-image-oem - 4.15.0.137.133
• linux-image-oracle - 4.15.0.1066.54
• linux-image-virtual-hwe-16.04 - 4.15.0.137.133

Ubuntu 14.04

• linux-image-4.15.0-1109-azure - 4.15.0-1109.121~14.04.1
• linux-image-azure - 4.15.0.1109.82

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-2021-3178
• CVE-2020-36158

Related notices

• USN-4878-1: linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1011-gkeop, linux-image-5.4.0-1039-oracle, linux, linux-gke-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-oracle-5.4, linux-azure-5.4, linux-image-lowlatency-hwe-18.04, linux-image-oracle-edge, linux-image-5.4.0-1039-aws, linux-image-gcp-edge, linux-image-generic-hwe-18.04, linux-image-raspi, linux-image-5.4.0-67-generic, linux-hwe-5.4, linux-gcp-5.4, linux-raspi, linux-gkeop-5.4, linux-image-5.4.0-1030-raspi, linux-image-azure-edge, linux-image-raspi2-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-gkeop, linux-azure, linux-image-5.4.0-67-generic-lpae, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-image-virtual-hwe-18.04, linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04-edge, linux-aws-5.4, linux-image-5.4.0-1041-azure, linux-image-oem-osp1, linux-image-azure, linux-raspi-5.4, linux-image-5.4.0-1034-kvm, linux-image-gkeop, linux-image-aws-edge, linux-gcp, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic, linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-1038-gcp, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-raspi-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-gkeop-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-gke-5.4, linux-image-virtual, linux-image-aws, linux-kvm, linux-aws, linux-image-5.4.0-67-lowlatency, linux-oracle, linux-image-5.4.0-1037-gke
• USN-4876-1: linux-image-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-smp, linux-image-4.4.0-204-generic, linux, linux-image-generic-lpae-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-204-generic-lpae, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-204-powerpc-e500mc, linux-image-4.4.0-1123-aws, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-lowlatency, linux-image-4.4.0-204-powerpc-smp, linux-image-snapdragon, linux-image-powerpc-smp, linux-lts-xenial, linux-image-generic-lpae, linux-image-4.4.0-1087-aws, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1089-kvm, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-204-powerpc64-smp, linux-image-virtual, linux-image-4.4.0-1151-snapdragon, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-aws, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-emb, linux-image-4.4.0-204-powerpc64-emb, linux-image-generic-lts-xenial, linux-image-4.4.0-204-lowlatency, linux-image-4.4.0-1147-raspi2, linux-image-virtual-lts-wily
• USN-4910-1: linux-hwe-5.8, linux-image-5.8.0-49-lowlatency, linux-image-kvm, linux-image-5.8.0-49-generic, linux, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1020-raspi-nolpae, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04, linux-image-oem-20.04, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-raspi, linux-azure, linux-image-lowlatency, linux-image-5.8.0-49-generic-64k, linux-image-generic-lpae, linux-image-5.8.0-1028-aws, linux-image-5.8.0-1020-raspi, linux-image-raspi-nolpae, linux-image-azure, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-49-generic-lpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-gcp, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-image-oracle, linux-image-gcp, linux-image-virtual, linux-image-5.8.0-1023-kvm, linux-image-aws, linux-kvm, linux-image-lowlatency-hwe-20.04, linux-aws, linux-image-5.8.0-1027-gcp, linux-image-gke, linux-image-5.8.0-1025-oracle, linux-image-5.8.0-1027-azure, linux-oracle, linux-image-generic-64k
• USN-4912-1: linux-image-5.6.0-1053-oem, linux-image-oem-20.04, linux-oem-5.6
• USN-4879-1: linux-hwe-5.8, linux-image-kvm, linux, linux-image-5.8.0-1017-raspi-nolpae, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1022-oracle, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04, linux-image-5.8.0-45-generic-64k, linux-image-oem-20.04, linux-image-5.8.0-45-generic-lpae, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-raspi, linux-image-5.8.0-1025-aws, linux-azure, linux-image-5.8.0-1024-gcp, linux-image-lowlatency, linux-image-generic-lpae, linux-image-5.8.0-45-generic, linux-image-raspi-nolpae, linux-image-azure, linux-image-virtual-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-gcp, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-image-oracle, linux-image-gcp, linux-image-virtual, linux-image-5.8.0-1017-raspi, linux-image-5.8.0-1024-azure, linux-image-aws, linux-kvm, linux-image-5.8.0-1020-kvm, linux-image-lowlatency-hwe-20.04, linux-aws, linux-image-5.8.0-45-lowlatency, linux-image-gke, linux-oracle, linux-image-generic-64k