USN-4884-1: Linux kernel (OEM) vulnerabilities

Releases

• Ubuntu 20.04 LTS

Packages

• linux-oem-5.10 - Linux kernel for OEM systems

Details

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)

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)

It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2021-3348)

Update instructions

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

Ubuntu 20.04

• linux-image-5.10.0-1017-oem - 5.10.0-1017.18
• linux-image-oem-20.04b - 5.10.0.1017.18

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-2021-3348
• CVE-2021-20194
• CVE-2021-3347

Related notices

• USN-4907-1: linux-image-azure, linux-image-4.15.0-1083-raspi2, linux-image-virtual-hwe-16.04-edge, linux-kvm, linux-image-4.15.0-1098-aws, linux-snapdragon, linux-image-gcp, linux-image-generic-lpae, linux-image-virtual, linux-image-lowlatency-hwe-16.04, linux-image-snapdragon, linux-image-oracle, linux-gcp-4.15, linux-image-gke, linux-image-dell300x, linux-image-4.15.0-1016-dell300x, linux-image-4.15.0-141-generic, linux-image-4.15.0-1089-kvm, linux-image-raspi2, linux-image-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux-gcp, linux-image-azure-edge, linux-image-oracle-lts-18.04, linux-image-4.15.0-1097-gcp, linux-raspi2, linux-image-azure-lts-18.04, linux-oracle, linux-image-gcp-lts-18.04, linux-image-aws-hwe, linux-image-lowlatency, linux-image-aws-lts-18.04, linux, linux-azure, linux-image-4.15.0-1112-azure, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1069-oracle, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-dell300x, linux-image-4.15.0-1100-snapdragon, linux-image-virtual-hwe-16.04, linux-image-generic, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-141-lowlatency, linux-image-4.15.0-141-generic-lpae, linux-azure-4.15, linux-aws
• USN-4909-1: linux-image-azure, linux-kvm, linux-image-virtual-hwe-18.04-edge, linux-gkeop-5.4, linux-image-5.4.0-1013-gkeop, linux-image-5.4.0-1041-gcp, linux-image-generic-hwe-18.04, linux-image-gkeop, linux-image-5.4.0-71-lowlatency, linux-image-gcp, linux-image-5.4.0-1043-aws, linux-image-generic-lpae, linux-image-virtual, linux-aws, linux-image-gkeop-5.4, linux-image-oracle, linux-image-gke-5.4, linux-image-aws-edge, linux-image-raspi-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-aws, linux-oracle-5.4, linux-image-raspi, linux-image-5.4.0-1040-gke, linux-image-oem-osp1, linux-image-generic-hwe-18.04-edge, linux-raspi-5.4, linux-image-5.4.0-1033-raspi, linux-image-raspi2, linux-image-generic-lpae-hwe-18.04-edge, linux-image-kvm, linux-image-5.4.0-1037-kvm, linux-gcp, linux-image-5.4.0-1042-oracle, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency, linux-gcp-5.4, linux-aws-5.4, linux-azure, linux, linux-image-gcp-edge, linux-image-raspi-hwe-18.04, linux-raspi, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04, linux-gkeop, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1044-azure, linux-image-5.4.0-71-generic-lpae, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-71-generic, linux-image-generic, linux-image-oracle-edge, linux-azure-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-oem, linux-image-azure-edge, linux-hwe-5.4, linux-gke-5.4
• USN-4910-1: linux-image-azure, linux-image-5.8.0-49-generic, linux-image-5.8.0-1025-oracle, linux-image-virtual-hwe-20.04, linux-kvm, linux-image-5.8.0-1023-kvm, linux-image-virtual-hwe-20.04-edge, linux-image-gcp, linux-image-generic-lpae, linux-image-5.8.0-1028-aws, linux-image-raspi-nolpae, linux-image-virtual, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1020-raspi-nolpae, linux-image-5.8.0-1027-azure, linux-image-oracle, linux-image-5.8.0-49-generic-lpae, linux-image-generic-hwe-20.04, linux-image-gke, linux-image-aws, linux-hwe-5.8, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-image-lowlatency-hwe-20.04-edge, linux-image-kvm, linux-gcp, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux-image-5.8.0-1027-gcp, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04-edge, linux-image-lowlatency, linux, linux-image-5.8.0-1020-raspi, linux-azure, linux-image-5.8.0-49-lowlatency, linux-raspi, linux-image-5.8.0-49-generic-64k, linux-image-lowlatency-hwe-20.04, linux-image-generic-64k, linux-image-generic, linux-image-oem-20.04, linux-aws
• USN-4879-1: linux-image-azure, linux-image-virtual-hwe-20.04, linux-kvm, linux-image-5.8.0-1017-raspi, linux-image-virtual-hwe-20.04-edge, linux-image-gcp, linux-image-generic-lpae, linux-image-5.8.0-1024-gcp, linux-image-5.8.0-45-generic-lpae, linux-image-raspi-nolpae, linux-image-virtual, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1025-aws, linux-image-oracle, linux-image-generic-hwe-20.04, linux-image-5.8.0-1024-azure, linux-image-gke, linux-image-aws, linux-hwe-5.8, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-image-lowlatency-hwe-20.04-edge, linux-image-kvm, linux-gcp, linux-image-5.8.0-1020-kvm, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04-edge, linux-image-lowlatency, linux-image-5.8.0-45-lowlatency, linux, linux-azure, linux-raspi, linux-image-5.8.0-45-generic-64k, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1022-oracle, linux-image-5.8.0-1017-raspi-nolpae, linux-image-generic-64k, linux-image-generic, linux-image-5.8.0-45-generic, linux-image-oem-20.04, linux-aws
• USN-4912-1: linux-image-5.6.0-1053-oem, linux-image-oem-20.04, linux-oem-5.6
• USN-4878-1: linux-image-azure, linux-image-5.4.0-1034-kvm, linux-azure-5.4, linux-kvm, linux-image-virtual-hwe-18.04-edge, linux-image-5.4.0-1039-aws, linux-gkeop-5.4, linux-image-generic-hwe-18.04, linux-image-gkeop, linux-image-gcp, linux-image-generic-lpae, linux-image-5.4.0-1030-raspi, linux-image-virtual, linux-aws, linux-image-gkeop-5.4, linux-image-oracle, linux-image-5.4.0-1039-oracle, linux-image-gke-5.4, linux-image-aws-edge, linux-image-raspi-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-aws, linux-oracle-5.4, linux-image-5.4.0-67-generic, linux-image-oem-osp1, linux-image-raspi, linux-image-generic-hwe-18.04-edge, linux-raspi-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-raspi2, linux-image-generic-lpae-hwe-18.04-edge, linux-image-kvm, linux-gcp, linux-image-5.4.0-1038-gcp, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency, linux-gcp-5.4, linux-aws-5.4, linux-azure, linux, linux-image-5.4.0-1037-gke, linux-image-gcp-edge, linux-image-raspi-hwe-18.04, linux-raspi, linux-image-5.4.0-67-lowlatency, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04, linux-gkeop, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1011-gkeop, linux-image-lowlatency-hwe-18.04-edge, linux-image-generic, linux-image-oracle-edge, linux-image-5.4.0-1041-azure, linux-image-5.4.0-67-generic-lpae, linux-image-oem, linux-image-azure-edge, linux-hwe-5.4, linux-gke-5.4