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

11 May 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

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

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.

Related notices

  • USN-4984-1: linux-image-gcp, linux-image-kvm, linux-image-generic-lpae-hwe-20.04-edge, linux-aws, linux-image-raspi, linux-image-5.8.0-1028-kvm, linux-image-5.8.0-55-lowlatency, linux-image-virtual, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1026-raspi-nolpae, linux-image-virtual-hwe-20.04-edge, linux-raspi, linux-oracle, linux-image-5.8.0-1033-azure, linux-image-oem-20.04, linux-image-5.8.0-1026-raspi, linux-image-generic-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1032-gcp, linux-image-azure, linux-hwe-5.8, linux-image-lowlatency, linux-azure, linux-image-generic-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-raspi-nolpae, linux-image-5.8.0-55-generic, linux-image-aws, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1035-aws, linux-image-generic-lpae, linux-image-generic, linux-gcp, linux-image-5.8.0-1031-oracle, linux-image-5.8.0-55-generic-lpae, linux-image-oracle, linux-image-lowlatency-hwe-20.04-edge, linux, linux-image-gke, linux-image-virtual-hwe-20.04, linux-image-5.8.0-55-generic-64k, linux-kvm, linux-image-generic-64k
  • USN-4945-2: linux-raspi-5.4, linux-image-raspi, linux-image-raspi2-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-raspi-hwe-18.04, linux-image-raspi2, linux-image-raspi-hwe-18.04-edge, linux-raspi, linux-image-5.4.0-1035-raspi
  • 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-4945-1: linux-image-gcp, linux-image-kvm, linux-image-5.4.0-73-lowlatency, linux-aws, linux-gkeop-5.4, linux-gke-5.4, linux-image-oem, linux-image-gcp-edge, linux-oracle-5.4, linux-image-virtual, linux-image-oem-osp1, linux-image-snapdragon-hwe-18.04, linux-gcp-5.4, linux-image-virtual-hwe-18.04-edge, linux-image-5.4.0-1048-aws, linux-image-snapdragon-hwe-18.04-edge, linux-oracle, linux-image-generic-lpae-hwe-18.04-edge, linux-image-azure, linux-kvm, linux-image-5.4.0-73-generic-lpae, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency, linux-image-5.4.0-73-generic, linux-image-generic-lpae-hwe-18.04, linux-azure, linux-gke, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-1047-azure, linux-image-gkeop, linux-image-gkeop-5.4, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1044-oracle, linux-image-aws, linux-image-generic-hwe-18.04, linux-image-oracle-edge, linux-image-generic-hwe-18.04-edge, linux-image-generic-lpae, linux-image-generic, linux-azure-5.4, linux-gcp, linux-image-5.4.0-1039-kvm, linux-image-oracle, linux-image-5.4.0-1043-gke, linux, linux-hwe-5.4, linux-image-gke, linux-image-5.4.0-1015-gkeop, linux-image-5.4.0-1045-oracle, linux-image-gke-5.4, linux-gkeop, linux-image-aws-edge, linux-image-azure-edge, linux-aws-5.4, linux-image-5.4.0-1043-gcp
  • USN-4911-1: linux-oem-5.10, linux-image-5.10.0-1021-oem, linux-image-oem-20.04b, linux-image-oem-20.04-edge
  • USN-4949-1: linux-image-gcp, linux-image-kvm, linux-image-generic-lpae-hwe-20.04-edge, linux-aws, linux-image-raspi, linux-image-virtual, linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-20.04-edge, linux-raspi, linux-oracle, linux-image-oem-20.04, linux-image-5.8.0-1029-oracle, linux-image-5.8.0-53-generic-64k, linux-image-generic-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-53-lowlatency, linux-image-azure, linux-hwe-5.8, linux-image-5.8.0-1024-raspi, linux-image-lowlatency, linux-azure, linux-image-generic-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-1032-azure, linux-image-5.8.0-53-generic-lpae, linux-image-raspi-nolpae, linux-image-aws, linux-image-5.8.0-1031-gcp, linux-image-generic-64k-hwe-20.04, linux-image-generic-lpae, linux-image-generic, linux-gcp, linux-image-oracle, linux-image-5.8.0-1024-raspi-nolpae, linux-image-lowlatency-hwe-20.04-edge, linux, linux-image-5.8.0-1033-aws, linux-image-gke, linux-image-5.8.0-1027-kvm, linux-image-5.8.0-53-generic, linux-image-virtual-hwe-20.04, linux-kvm, linux-image-generic-64k
  • USN-4946-1: linux-image-gcp, linux-image-4.15.0-1099-gcp, linux-image-kvm, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1071-oracle, linux-image-4.15.0-1091-kvm, linux-snapdragon, linux-aws, linux-aws-hwe, linux-image-oem, linux-image-4.15.0-1018-dell300x, linux-image-virtual, linux-oracle, linux-image-gcp-lts-18.04, linux-image-generic-hwe-16.04-edge, linux-image-aws-hwe, linux-image-4.15.0-1085-raspi2, linux-image-azure, linux-kvm, linux-image-4.15.0-143-generic, linux-image-virtual-hwe-16.04, linux-image-raspi2, linux-image-lowlatency, linux-raspi2, linux-gcp-4.15, linux-azure, linux-image-dell300x, linux-image-aws-lts-18.04, linux-image-4.15.0-1102-aws, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1102-snapdragon, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1114-azure, linux-image-azure-lts-18.04, linux-azure-4.15, linux-image-generic-lpae, linux-image-generic, linux-hwe, linux-gcp, linux-image-oracle, linux-image-oracle-lts-18.04, linux-image-generic-hwe-16.04, linux-image-4.15.0-143-lowlatency, linux, linux-image-snapdragon, linux-image-gke, linux-image-4.15.0-143-generic-lpae, linux-image-generic-lpae-hwe-16.04-edge, linux-dell300x