USN-4577-1: Linux kernel vulnerabilities

14 October 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
  • linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-oem-osp1 - Linux kernel for OEM systems
  • linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V8) systems

Details

Hador Manor discovered that the DCCP protocol implementation in the Linux
kernel improperly handled socket reuse, 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-2020-16119)

Giuseppe Scrivano discovered that the overlay file system in the Linux
kernel did not properly perform permission checks in some situations. A
local attacker could possibly use this to bypass intended restrictions and
gain read access to restricted files. (CVE-2020-16120)

Update instructions

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

Ubuntu 18.04

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-4580-1: linux-image-generic-lts-trusty, linux-image-lowlatency-pae, linux-image-virtual, linux-image-3.2.0-149-omap, linux-image-3.2.0-149-generic, linux-image-3.13.0-182-lowlatency, linux-image-omap, linux-image-3.13.0-182-generic-lpae, linux-image-3.2.0-149-virtual, linux-image-highbank, linux-image-3.2.0-149-highbank, linux, linux-image-server, linux-image-generic, linux-image-3.13.0-182-generic, linux-image-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-3.2.0-149-generic-pae, linux-lts-trusty, linux-image-generic-pae, linux-image-lowlatency
  • USN-4576-1: linux-image-virtual-hwe-18.04, linux-aws, linux-image-generic-hwe-20.04, linux-image-raspi2, linux-image-generic-lpae-hwe-20.04, linux-oracle-5.4, linux-hwe-5.4, linux-image-5.4.0-1021-raspi, linux-image-oem, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1028-gcp, linux-gcp, linux-image-virtual, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1028-oracle, linux-image-gcp, linux-image-5.4.0-51-generic, linux-image-generic-lpae-hwe-18.04, linux-azure, linux-kvm, linux-image-5.4.0-51-generic-lpae, linux-image-5.4.0-1031-azure, linux-image-azure, linux, linux-image-5.4.0-51-lowlatency, linux-image-raspi, linux-image-5.4.0-1028-aws, linux-image-generic-hwe-18.04, linux-image-generic, linux-oracle, linux-image-kvm, linux-image-virtual-hwe-20.04, linux-image-oracle, linux-raspi-5.4, linux-image-oem-osp1, linux-raspi, linux-image-generic-lpae, linux-image-gke, linux-azure-5.4, linux-image-lowlatency, linux-image-raspi-hwe-18.04, linux-aws-5.4, linux-image-5.4.0-1026-kvm, linux-image-snapdragon-hwe-18.04, linux-image-aws, linux-gcp-5.4
  • USN-4579-1: linux-aws, linux-image-4.4.0-193-powerpc-e500mc, linux-image-raspi2, linux-image-4.4.0-1117-aws, linux-raspi2, linux-image-powerpc64-emb, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-powerpc-smp, linux-image-4.4.0-193-generic-lpae, linux-image-4.4.0-193-powerpc-smp, linux-image-4.4.0-193-powerpc64-smp, linux-image-4.4.0-1141-raspi2, linux-image-4.4.0-1081-aws, linux-image-4.4.0-1145-snapdragon, linux-kvm, linux-snapdragon, linux-image-virtual-lts-xenial, linux, linux-image-snapdragon, linux-image-4.4.0-193-lowlatency, linux-lts-xenial, linux-image-generic, linux-image-kvm, linux-image-generic-lts-xenial, linux-image-generic-lpae, linux-image-4.4.0-1082-kvm, linux-image-powerpc64-smp, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-193-powerpc64-emb, linux-image-4.4.0-193-generic, linux-image-aws, linux-image-lowlatency
  • USN-4578-1: linux-image-4.15.0-121-lowlatency, linux-aws, linux-gke-4.15, linux-image-raspi2, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-raspi2, linux-image-oem, linux-image-powerpc64-emb, linux-gcp-4.15, linux-image-powerpc-e500mc, linux-gcp, linux-image-virtual, linux-oem, linux-image-4.15.0-1089-snapdragon, linux-image-gcp, linux-image-powerpc-smp, linux-image-4.15.0-1098-azure, linux-image-4.15.0-1099-azure, linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux-image-4.15.0-1077-kvm, linux-image-4.15.0-1086-aws, linux-image-4.15.0-1099-oem, linux-image-4.15.0-121-generic-lpae, linux-image-azure-lts-18.04, linux-image-oracle-lts-18.04, linux-azure-4.15, linux-azure, linux-kvm, linux-snapdragon, linux-image-azure, linux, linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-120-generic, linux-image-aws-lts-18.04, linux-image-generic, linux-image-4.15.0-1086-gcp, linux-oracle, linux-image-kvm, linux-image-4.15.0-1085-aws, linux-image-generic-hwe-16.04, linux-image-oracle, linux-image-4.15.0-1072-gke, linux-image-generic-lpae, linux-image-4.15.0-1056-oracle, linux-image-gke, linux-image-lowlatency, linux-image-powerpc64-smp, linux-aws-hwe, linux-image-4.15.0-120-generic-lpae, linux-image-4.15.0-1057-oracle, linux-image-4.15.0-1073-raspi2, linux-hwe, linux-image-4.15.0-120-lowlatency, linux-image-4.15.0-121-generic, linux-image-gcp-lts-18.04