USN-4911-1: Linux kernel (OEM) vulnerabilities

Releases

• Ubuntu 20.04 LTS

Packages

• linux-oem-5.10 - Linux kernel for OEM 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 fuse user space file system implementation in
the Linux kernel did not properly handle bad inodes in some situations. A
local attacker could possibly use this to cause a denial of service.
(CVE-2021-28950)

Update instructions

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

Ubuntu 20.04

• linux-image-5.10.0-1021-oem - 5.10.0-1021.22
• linux-image-oem-20.04b - 5.10.0.1021.22

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-2021-28950
• CVE-2020-25639
• CVE-2021-28038
• CVE-2021-28375

Related notices

• USN-4982-1: linux-image-5.4.0-74-generic-lpae, linux-gcp, linux-gkeop, linux-image-generic-lpae, linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-1036-raspi, linux-image-5.4.0-1040-kvm, linux-image-5.4.0-1044-gcp, linux-image-oracle, linux-image-gkeop-5.4, linux-image-oracle-edge, linux-image-lowlatency-hwe-18.04, linux-image-aws-edge, linux-image-virtual-hwe-18.04-edge, linux-image-raspi-hwe-18.04, linux-image-5.4.0-1049-aws, linux-oracle-5.4, linux-image-5.4.0-1044-gke, linux-image-oem-osp1, linux-image-raspi2-hwe-18.04-edge, linux-image-gkeop, linux-image-generic, linux-hwe-5.4, linux-image-5.4.0-1048-azure, linux-image-kvm, linux-image-5.4.0-1046-oracle, linux-gke-5.4, linux-kvm, linux-image-5.4.0-1016-gkeop, linux-image-5.4.0-74-generic, linux-image-raspi, linux-image-aws, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-image-raspi2-hwe-18.04, linux-gcp-5.4, linux-image-generic-hwe-18.04, linux-image-azure-edge, linux-image-gcp-edge, linux-gke, linux-image-azure, linux-image-virtual, linux-oracle, linux, linux-image-snapdragon-hwe-18.04, linux-image-oem, linux-raspi-5.4, linux-aws-5.4, linux-image-gcp, linux-image-gke, linux-azure, linux-azure-5.4, linux-aws, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-74-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-gke-5.4, linux-image-raspi2, linux-image-lowlatency-hwe-18.04-edge, linux-raspi, linux-gkeop-5.4, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual-hwe-18.04
• USN-4984-1: linux-image-5.8.0-55-generic, linux-image-lowlatency-hwe-20.04-edge, linux-gcp, linux-image-generic-lpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-oracle, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04, linux-image-5.8.0-1032-gcp, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-image-kvm, linux-image-5.8.0-1035-aws, linux-kvm, linux-image-raspi, linux-image-5.8.0-1033-azure, linux-image-generic-lpae-hwe-20.04, linux-image-aws, linux-image-generic-hwe-20.04, linux-image-lowlatency, linux-hwe-5.8, linux-image-virtual, linux-image-azure, linux-oracle, linux, linux-image-5.8.0-55-generic-64k, linux-image-raspi-nolpae, linux-image-5.8.0-1031-oracle, linux-image-gcp, linux-image-gke, linux-azure, linux-aws, linux-image-5.8.0-55-lowlatency, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-1026-raspi-nolpae, linux-image-5.8.0-1028-kvm, linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-55-generic-lpae, linux-image-oem-20.04, linux-image-5.8.0-1026-raspi, linux-raspi, linux-image-generic-64k
• USN-4945-1: linux-image-5.4.0-1047-azure, linux-gcp, linux-gkeop, linux-image-generic-lpae, linux-image-oracle, linux-image-gkeop-5.4, linux-image-5.4.0-73-lowlatency, linux-image-oracle-edge, linux-image-5.4.0-73-generic, linux-image-aws-edge, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-oracle-5.4, linux-image-oem-osp1, linux-image-gkeop, linux-image-generic, linux-hwe-5.4, linux-image-kvm, linux-gke-5.4, linux-kvm, linux-image-5.4.0-1044-oracle, linux-image-5.4.0-1015-gkeop, linux-image-5.4.0-1045-oracle, linux-image-5.4.0-1043-gke, linux-image-aws, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-gcp-5.4, linux-image-generic-hwe-18.04, linux-image-azure-edge, linux-image-gcp-edge, linux-gke, linux-image-azure, linux-image-5.4.0-1043-gcp, linux-image-virtual, linux-oracle, linux, linux-image-5.4.0-73-generic-lpae, linux-image-oem, linux-image-snapdragon-hwe-18.04, linux-aws-5.4, linux-image-gcp, linux-image-gke, linux-azure, linux-azure-5.4, linux-aws, linux-image-5.4.0-1039-kvm, linux-image-5.4.0-1048-aws, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04, linux-image-gke-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-gkeop-5.4, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual-hwe-18.04
• USN-4949-1: linux-image-lowlatency-hwe-20.04-edge, linux-gcp, linux-image-generic-lpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-oracle, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04, linux-image-5.8.0-1029-oracle, linux-image-5.8.0-1024-raspi, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-image-kvm, linux-kvm, linux-image-5.8.0-1032-azure, linux-image-5.8.0-1024-raspi-nolpae, linux-image-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-aws, linux-image-generic-hwe-20.04, linux-image-lowlatency, linux-hwe-5.8, linux-image-5.8.0-1031-gcp, linux-image-5.8.0-53-generic-lpae, linux-image-virtual, linux-image-azure, linux-oracle, linux, linux-image-5.8.0-53-lowlatency, linux-image-raspi-nolpae, linux-image-gcp, linux-image-gke, linux-azure, linux-aws, linux-image-5.8.0-53-generic-64k, linux-image-5.8.0-53-generic, linux-image-generic-hwe-20.04-edge, linux-image-virtual-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1033-aws, linux-image-oem-20.04, linux-image-5.8.0-1027-kvm, linux-raspi, linux-image-generic-64k
• USN-4945-2: linux-image-raspi2-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-raspi-5.4, linux-image-raspi, linux-image-raspi2, linux-raspi, linux-image-5.4.0-1035-raspi, linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04
• USN-4904-1: linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-208-generic, linux-image-generic-lpae, linux-image-4.4.0-1126-aws, linux-image-generic-lts-wily, linux-image-4.4.0-208-powerpc64-emb, linux-image-4.4.0-208-powerpc-smp, linux-image-generic-lts-xenial, linux-image-powerpc-e500mc, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-virtual-lts-utopic, linux-image-lowlatency-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-generic, linux-image-kvm, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-smp, linux-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lpae-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-image-aws, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-lowlatency-lts-wily, linux-lts-xenial, linux-image-4.4.0-208-powerpc-e500mc, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-1150-raspi2, linux, linux-raspi2, linux-image-4.4.0-1154-snapdragon, linux-image-virtual-lts-xenial, linux-image-4.4.0-208-powerpc64-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-aws, linux-image-virtual-lts-wily, linux-image-4.4.0-208-lowlatency, linux-image-4.4.0-1090-aws, linux-image-snapdragon, linux-image-powerpc-smp-lts-xenial, linux-snapdragon, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-vivid, linux-image-raspi2, linux-image-4.4.0-1091-kvm, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-208-generic-lpae, linux-image-generic-lpae-lts-wily
• USN-4946-1: linux-gcp, linux-image-generic-lpae, linux-image-azure-lts-18.04, linux-image-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1018-dell300x, linux-image-generic, linux-image-kvm, linux-image-4.15.0-1102-aws, linux-kvm, linux-image-4.15.0-143-generic, linux-image-generic-lpae-hwe-16.04-edge, linux-gcp-4.15, linux-dell300x, linux-image-aws-lts-18.04, linux-image-lowlatency, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1099-gcp, linux-image-virtual-hwe-16.04-edge, linux-image-virtual, linux-image-azure, linux-oracle, linux, linux-raspi2, linux-azure-4.15, linux-hwe, linux-image-4.15.0-1071-oracle, linux-image-oem, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-143-lowlatency, linux-image-gcp, linux-azure, linux-aws-hwe, linux-aws, linux-image-gke, linux-image-4.15.0-1085-raspi2, linux-image-4.15.0-1114-azure, linux-image-snapdragon, linux-snapdragon, linux-image-aws-hwe, linux-image-4.15.0-143-generic-lpae, linux-image-dell300x, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1102-snapdragon, linux-image-generic-hwe-16.04, linux-image-raspi2, linux-image-gcp-lts-18.04, linux-image-4.15.0-1091-kvm, linux-image-oracle-lts-18.04
• USN-4947-1: linux-oem-5.6, linux-image-5.6.0-1056-oem, linux-image-oem-20.04