USN-4878-1: Linux kernel vulnerabilities

Releases

• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) 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 - 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-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
• linux-raspi - Linux kernel for Raspberry Pi (V8) 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

• 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

• 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

• CVE-2021-3347
• CVE-2021-3178
• CVE-2020-36158
• CVE-2021-20239

Related notices

• USN-4884-1: linux-image-oem-20.04-edge, linux-oem-5.10, linux-image-5.10.0-1017-oem, linux-image-oem-20.04b
• USN-4907-1: linux-image-virtual, linux-image-gcp-lts-18.04, linux-image-4.15.0-141-lowlatency, linux-image-4.15.0-1083-raspi2, linux-image-virtual-hwe-16.04-edge, linux-image-dell300x, linux-image-generic-hwe-16.04-edge, linux-image-gcp, linux-kvm, linux-image-lowlatency, linux-gcp-4.15, linux-raspi2, linux-image-virtual-hwe-16.04, linux-image-aws-lts-18.04, linux-image-4.15.0-1100-snapdragon, linux-image-4.15.0-1098-aws, linux, linux-azure, linux-image-4.15.0-1089-kvm, linux-image-4.15.0-1112-azure, linux-image-generic, linux-image-lowlatency-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04, linux-image-azure-edge, linux-image-4.15.0-1097-gcp, linux-image-4.15.0-141-generic-lpae, linux-gcp, linux-dell300x, linux-image-4.15.0-1069-oracle, linux-snapdragon, linux-image-azure-lts-18.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1016-dell300x, linux-image-aws-hwe, linux-oracle, linux-image-oracle, linux-image-raspi2, linux-image-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux-image-gke, linux-image-generic-hwe-16.04, linux-image-generic-lpae, linux-image-snapdragon, linux-aws-hwe, linux-image-oracle-lts-18.04, linux-aws, linux-image-azure, linux-image-4.15.0-141-generic, linux-azure-4.15
• USN-4910-1: linux-raspi, linux-image-5.8.0-1025-oracle, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual, linux-image-5.8.0-1027-azure, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-49-generic-lpae, linux-image-generic-lpae-hwe-20.04, linux-hwe-5.8, linux-image-virtual-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04-edge, linux-image-gcp, linux-kvm, linux-image-lowlatency, linux, linux-image-aws, linux-azure, linux-image-generic, linux-image-5.8.0-1020-raspi-nolpae, linux-gcp, linux-image-generic-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-49-generic-64k, linux-image-5.8.0-1027-gcp, linux-oracle, linux-image-5.8.0-1023-kvm, linux-image-5.8.0-49-generic, linux-image-5.8.0-1020-raspi, linux-image-oracle, linux-image-lowlatency-hwe-20.04, linux-image-kvm, linux-image-gke, linux-image-5.8.0-49-lowlatency, linux-image-generic-64k, linux-image-generic-lpae, linux-image-raspi, linux-image-raspi-nolpae, linux-image-oem-20.04, linux-aws, linux-image-azure, linux-image-5.8.0-1028-aws, linux-image-lowlatency-hwe-20.04-edge
• USN-4877-1: linux-image-virtual, linux-image-oem, linux-image-gcp-lts-18.04, linux-image-4.15.0-137-generic, linux-image-virtual-hwe-16.04-edge, linux-image-dell300x, linux-image-4.15.0-1094-gcp, linux-image-generic-hwe-16.04-edge, linux-image-gcp, linux-kvm, linux-image-lowlatency, linux-gcp-4.15, linux-raspi2, linux-image-4.15.0-137-lowlatency, linux-image-virtual-hwe-16.04, linux-image-aws-lts-18.04, linux-image-4.15.0-1095-aws, linux, linux-azure, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic, linux-image-lowlatency-hwe-16.04, linux-image-azure-edge, linux-image-4.15.0-1066-oracle, linux-image-4.15.0-1086-kvm, linux-gcp, linux-image-4.15.0-1097-snapdragon, linux-dell300x, linux-snapdragon, linux-image-4.15.0-137-generic-lpae, linux-image-azure-lts-18.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1109-azure, linux-image-4.15.0-1013-dell300x, linux-oracle, linux-image-oracle, linux-hwe, linux-image-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux-image-gke, linux-image-generic-hwe-16.04, linux-image-4.15.0-1080-raspi2, linux-image-generic-lpae, linux-image-raspi2, linux-image-snapdragon, linux-aws-hwe, linux-image-oracle-lts-18.04, linux-aws, linux-image-azure, linux-image-aws-hwe, linux-azure-4.15
• USN-4876-1: linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp, linux-image-virtual, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1089-kvm, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1087-aws, linux-image-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-kvm, linux-raspi2, linux-image-generic-lts-wily, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-emb, linux-image-4.4.0-204-powerpc64-emb, linux-image-4.4.0-1123-aws, linux, linux-image-aws, linux-image-powerpc64-emb-lts-utopic, linux-lts-xenial, linux-image-generic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-204-generic-lpae, linux-image-powerpc-smp, linux-snapdragon, linux-image-4.4.0-204-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-204-generic, linux-image-4.4.0-204-lowlatency, linux-image-generic-lts-xenial, linux-image-virtual-lts-utopic, linux-image-4.4.0-204-powerpc-smp, linux-image-raspi2, linux-image-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-kvm, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1147-raspi2, linux-image-generic-lpae, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1151-snapdragon, linux-image-virtual-lts-xenial, linux-image-4.4.0-204-powerpc-e500mc, linux-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-virtual-lts-wily
• USN-4912-1: linux-image-5.6.0-1053-oem, linux-image-oem-20.04, linux-oem-5.6
• USN-4879-1: linux-image-5.8.0-1017-raspi-nolpae, linux-raspi, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-1024-gcp, linux-image-generic-lpae-hwe-20.04, linux-hwe-5.8, linux-image-virtual-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-45-generic, linux-image-5.8.0-1020-kvm, linux-image-gcp, linux-image-lowlatency, linux-image-5.8.0-45-generic-lpae, linux-kvm, linux-image-5.8.0-1022-oracle, linux, linux-image-aws, linux-azure, linux-image-generic, linux-image-5.8.0-1025-aws, linux-gcp, linux-image-generic-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1017-raspi, linux-image-5.8.0-1024-azure, linux-oracle, linux-image-5.8.0-45-generic-64k, linux-image-oracle, linux-image-lowlatency-hwe-20.04, linux-image-kvm, linux-image-gke, linux-image-5.8.0-45-lowlatency, linux-image-generic-64k, linux-image-generic-lpae, linux-image-raspi, linux-image-raspi-nolpae, linux-image-oem-20.04, linux-aws, linux-image-azure, linux-image-lowlatency-hwe-20.04-edge