USN-4947-1: Linux kernel (OEM) vulnerabilities

Releases

• Ubuntu 20.04 LTS

Packages

• linux-oem-5.6 - Linux kernel for OEM systems

Details

Kiyin (尹亮) discovered that the x25 implementation in the Linux kernel
contained overflows when handling addresses from user space. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-35519)

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 TIPC protocol implementation in the Linux kernel
did not properly validate passed encryption key sizes. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2021-29646)

It was discovered that a race condition existed in the netfilter subsystem
of the Linux kernel when replacing tables. A local attacker could use this
to cause a denial of service (system crash). (CVE-2021-29650)

Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel
did not properly deallocate memory in some situations. A local attacker
could use this to cause a denial of service (memory exhaustion).
(CVE-2021-30002)

Update instructions

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

Ubuntu 20.04

• linux-image-5.6.0-1056-oem - 5.6.0-1056.60
• linux-image-oem-20.04 - 5.6.0.1056.52

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-2020-35519
• CVE-2021-29650
• CVE-2021-29646
• CVE-2021-28375
• CVE-2021-30002

Related notices

• USN-4945-1: linux-gkeop, linux-image-azure, linux-image-oem, linux-gcp-5.4, linux-gkeop-5.4, linux-image-gkeop-5.4, linux-kvm, linux-image-5.4.0-73-lowlatency, linux-image-oracle, linux-image-snapdragon-hwe-18.04, linux-azure, linux-image-5.4.0-73-generic, linux-gke-5.4, linux-image-kvm, linux-aws-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-generic-lpae, linux-image-5.4.0-1015-gkeop, linux-gcp, linux-image-5.4.0-73-generic-lpae, linux-image-generic-lpae-hwe-18.04-edge, linux-image-generic-hwe-18.04-edge, linux-gke, linux-image-gcp-edge, linux-image-gkeop, linux-image-lowlatency, linux-oracle, linux-image-5.4.0-1043-gke, linux-image-5.4.0-1039-kvm, linux-oracle-5.4, linux-image-generic, linux-image-virtual-hwe-18.04-edge, linux-image-virtual, linux-image-azure-edge, linux, linux-image-gcp, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1047-azure, linux-image-aws-edge, linux-image-virtual-hwe-18.04, linux-aws, linux-azure-5.4, linux-image-gke, linux-image-lowlatency-hwe-18.04-edge, linux-hwe-5.4, linux-image-5.4.0-1043-gcp, linux-image-5.4.0-1048-aws, linux-image-5.4.0-1045-oracle, linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-oracle-edge, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1044-oracle, linux-image-aws, linux-image-gke-5.4
• USN-4946-1: linux-gcp-4.15, linux-image-azure, linux-image-4.15.0-1085-raspi2, linux-image-oem, linux-image-gcp-lts-18.04, linux-kvm, linux-image-4.15.0-143-generic-lpae, linux-image-oracle, linux-azure, linux-image-4.15.0-1099-gcp, linux-image-kvm, linux-image-aws-lts-18.04, linux-aws-hwe, linux-image-oracle-lts-18.04, linux-image-4.15.0-1102-snapdragon, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae, linux-gcp, linux-image-aws-hwe, linux-image-4.15.0-1114-azure, linux-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1018-dell300x, linux-image-generic, linux-image-virtual-hwe-16.04, linux-hwe, linux-image-4.15.0-1102-aws, linux-image-dell300x, linux-image-virtual, linux-snapdragon, linux, linux-image-gcp, linux-image-generic-hwe-16.04-edge, linux-image-generic-hwe-16.04, linux-image-4.15.0-1071-oracle, linux-image-snapdragon, linux-raspi2, linux-aws, linux-image-gke, linux-dell300x, linux-image-azure-lts-18.04, linux-image-raspi2, linux-azure-4.15, linux-image-4.15.0-1091-kvm, linux-image-4.15.0-143-lowlatency, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-143-generic, linux-image-generic-lpae-hwe-16.04-edge, linux-image-lowlatency, linux-image-lowlatency-hwe-16.04
• USN-4948-1: linux-oem-5.10, linux-image-oem-20.04b, linux-image-5.10.0-1026-oem, linux-image-oem-20.04-edge
• USN-4949-1: linux-image-raspi-nolpae, linux-image-generic-lpae-hwe-20.04-edge, linux-image-azure, linux-image-lowlatency-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-53-lowlatency, linux-image-5.8.0-1024-raspi, linux-kvm, linux-image-5.8.0-53-generic-lpae, linux-image-oem-20.04, linux-image-oracle, linux-azure, linux-image-generic-hwe-20.04-edge, linux-image-kvm, linux-image-generic-lpae-hwe-20.04, linux-image-generic-lpae, linux-gcp, linux-image-5.8.0-1033-aws, linux-image-5.8.0-1024-raspi-nolpae, linux-image-5.8.0-1032-azure, linux-image-lowlatency-hwe-20.04, linux-oracle, linux-image-generic, linux-image-virtual, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-1029-oracle, linux-image-raspi, linux, linux-image-gcp, linux-image-virtual-hwe-20.04, linux-image-5.8.0-53-generic, linux-aws, linux-image-gke, linux-hwe-5.8, linux-image-generic-64k, linux-image-5.8.0-1031-gcp, linux-image-5.8.0-53-generic-64k, linux-raspi, linux-image-generic-64k-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-5.8.0-1027-kvm, linux-image-lowlatency, linux-image-aws
• USN-4945-2: linux-image-raspi2-hwe-18.04, linux-image-raspi2, linux-image-5.4.0-1035-raspi, linux-image-raspi-hwe-18.04-edge, linux-image-raspi-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-raspi, linux-image-raspi, linux-raspi-5.4
• USN-5343-1: linux-tools-virtual, linux-aws-tools-4.4.0-1102, linux-aws-cloud-tools-4.4.0-1102, linux-tools-lts-utopic, linux-image-extra-virtual-lts-utopic, linux-tools-virtual-lts-utopic, linux-modules-extra-4.4.0-1138-aws, linux-generic, linux-tools-lowlatency, linux-kvm-headers-4.4.0-1103, linux-lowlatency, linux-image-lowlatency-lts-wily, linux-lts-xenial-cloud-tools-4.4.0-222, linux-tools-common, linux-headers-generic-lts-xenial, linux-image-generic-lts-vivid, linux-image-extra-virtual-lts-wily, linux-signed-image-generic-lts-utopic, linux-image-4.4.0-1138-aws, linux-image-unsigned-4.4.0-222-lowlatency, linux-tools-4.4.0-1138-aws, linux-tools-lowlatency-lts-wily, linux-headers-virtual-lts-wily, linux-image-virtual, linux-cloud-tools-generic-lts-xenial, linux-modules-extra-aws, linux-image-hwe-virtual-trusty, linux-cloud-tools-lowlatency-lts-wily, linux-kvm-cloud-tools-4.4.0-1103, linux-aws-cloud-tools-4.4.0-1138, linux-image-virtual-lts-xenial, linux-tools-lowlatency-lts-utopic, linux-headers-virtual-lts-xenial, linux-tools-virtual-lts-wily, linux-buildinfo-4.4.0-1103-kvm, linux-cloud-tools-virtual-lts-wily, linux-cloud-tools-common, linux-image-virtual-lts-vivid, linux-virtual-lts-wily, linux-cloud-tools-4.4.0-1102-aws, linux-hwe-virtual-trusty, linux-aws-tools-4.4.0-1138, linux-aws-headers-4.4.0-1102, linux-signed-generic, linux-generic-lts-utopic, linux-signed-generic-lts-xenial, linux-image-4.4.0-1102-aws, linux-virtual-lts-vivid, linux-lts-xenial-tools-4.4.0-222, linux-tools-generic, linux-kvm, linux-signed-generic-lts-utopic, linux-cloud-tools-virtual-lts-xenial, linux-cloud-tools-lowlatency, linux-cloud-tools-lowlatency-lts-utopic, linux-lts-xenial, linux-image-extra-virtual, linux-generic-lts-wily, linux-tools-aws, linux-headers-virtual-lts-utopic, linux-cloud-tools-generic-lts-vivid, linux-headers-aws, linux-modules-4.4.0-1103-kvm, linux-tools-virtual-lts-vivid, linux-image-generic-lts-xenial, linux-headers-4.4.0-222-generic, linux-tools-4.4.0-1103-kvm, linux-headers-lowlatency-lts-vivid, linux-signed-generic-lts-wily, linux-cloud-tools-virtual-lts-vivid, linux-hwe-generic-trusty, linux-tools-kvm, linux-image-hwe-generic-trusty, linux-tools-generic-lts-vivid, linux-lowlatency-lts-vivid, linux-signed-image-generic-lts-xenial, linux-cloud-tools-4.4.0-222-generic, linux-cloud-tools-4.4.0-222, linux-image-generic-lts-wily, linux-lowlatency-lts-xenial, linux-signed-image-lowlatency-lts-wily, linux-signed-generic-lts-vivid, linux-cloud-tools-generic-lts-wily, linux-crashdump, linux-buildinfo-4.4.0-222-lowlatency, linux-image-generic-lts-utopic, linux-headers-generic-lts-wily, linux-buildinfo-4.4.0-1138-aws, linux-tools-generic-lts-utopic, linux-signed-image-generic-lts-wily, linux-headers-kvm, linux-cloud-tools-lowlatency-lts-vivid, linux-tools-4.4.0-1102-aws, linux-tools-host, linux-headers-generic-lts-vivid, linux-buildinfo-4.4.0-222-generic, linux-modules-4.4.0-1102-aws, linux-buildinfo-4.4.0-1102-aws, linux-image-virtual-lts-utopic, linux-cloud-tools-4.4.0-1103-kvm, linux-tools-virtual-lts-xenial, linux-image-extra-virtual-lts-vivid, linux-signed-image-generic, linux-tools-4.4.0-222-generic, linux-virtual, linux-cloud-tools-lowlatency-lts-xenial, linux-image-lowlatency-lts-vivid, linux-aws-headers-4.4.0-1138, linux-headers-lowlatency-lts-xenial, linux-image-4.4.0-222-lowlatency, linux-virtual-lts-utopic, linux-image-generic, linux-headers-lowlatency-lts-utopic, linux-signed-lowlatency-lts-wily, linux-tools-generic-lts-wily, linux-image-virtual-lts-wily, linux, linux-image-extra-virtual-lts-xenial, linux-image-lowlatency-lts-utopic, linux-modules-4.4.0-222-lowlatency, linux-source-4.4.0, linux-headers-virtual-lts-vivid, linux-tools-lowlatency-lts-xenial, linux-modules-4.4.0-222-generic, linux-signed-image-lowlatency-lts-xenial, linux-doc, linux-signed-image-generic-lts-vivid, linux-lowlatency-lts-utopic, linux-modules-extra-4.4.0-222-generic, linux-cloud-tools-virtual-lts-utopic, linux-headers-generic, linux-image-4.4.0-222-generic, linux-lowlatency-lts-wily, linux-image-lowlatency-lts-xenial, linux-tools-4.4.0-222-lowlatency, linux-cloud-tools-4.4.0-222-lowlatency, linux-source, linux-signed-lowlatency, linux-signed-lowlatency-lts-xenial, linux-image-kvm, linux-headers-lowlatency, linux-cloud-tools-virtual, linux-libc-dev, linux-virtual-lts-xenial, linux-modules-4.4.0-1138-aws, linux-headers-virtual, linux-tools-generic-lts-xenial, linux-generic-lts-vivid, linux-headers-4.4.0-1103-kvm, linux-tools-4.4.0-222, linux-kvm-tools-4.4.0-1103, linux-image-unsigned-4.4.0-222-generic, linux-headers-4.4.0-222, linux-cloud-tools-generic-lts-utopic, linux-image-4.4.0-1103-kvm, linux-headers-4.4.0-1138-aws, linux-signed-image-lowlatency, linux-tools-lowlatency-lts-vivid, linux-headers-lowlatency-lts-wily, linux-generic-lts-xenial, linux-cloud-tools-4.4.0-1138-aws, linux-aws, linux-headers-4.4.0-222-lowlatency, linux-cloud-tools-generic, linux-headers-generic-lts-utopic, linux-image-lowlatency, linux-image-aws, linux-headers-4.4.0-1102-aws
• USN-4911-1: linux-image-oem-20.04-edge, linux-image-oem-20.04b, linux-oem-5.10, linux-image-5.10.0-1021-oem
• USN-4984-1: linux-image-raspi-nolpae, linux-image-generic-lpae-hwe-20.04-edge, linux-image-azure, linux-image-lowlatency-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-1031-oracle, linux-kvm, linux-image-oem-20.04, linux-image-oracle, linux-azure, linux-image-generic-hwe-20.04-edge, linux-image-kvm, linux-image-5.8.0-55-lowlatency, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1026-raspi-nolpae, linux-image-generic-lpae, linux-gcp, linux-image-5.8.0-1032-gcp, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-55-generic-lpae, linux-oracle, linux-image-5.8.0-1026-raspi, linux-image-generic, linux-image-virtual, linux-image-virtual-hwe-20.04-edge, linux-image-raspi, linux, linux-image-gcp, linux-image-virtual-hwe-20.04, linux-image-5.8.0-1035-aws, linux-image-5.8.0-55-generic, linux-aws, linux-image-5.8.0-1033-azure, linux-image-gke, linux-hwe-5.8, linux-image-generic-64k, linux-image-5.8.0-1028-kvm, linux-raspi, linux-image-generic-64k-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-lowlatency, linux-image-aws, linux-image-5.8.0-55-generic-64k