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USN-4578-1: Linux kernel vulnerabilities

14 October 2020

Several security issues were fixed in the Linux kernel.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Hadar 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)

Wen Xu discovered that the XFS file system in the Linux kernel did not
properly validate inode metadata in some situations. An attacker could use
this to construct a malicious XFS image that, when mounted, could cause a
denial of service (system crash). (CVE-2018-10322)

It was discovered that the btrfs file system in the Linux kernel contained
a use-after-free vulnerability when merging free space. An attacker could
use this to construct a malicious btrfs image that, when mounted and
operated on, could cause a denial of service (system crash).
(CVE-2019-19448)

Jay Shin discovered that the ext4 file system implementation in the Linux
kernel did not properly handle directory access with broken indexing,
leading to an out-of-bounds read vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2020-14314)

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)

It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

It was discovered that the NFC implementation in the Linux kernel did not
properly perform permissions checks when opening raw sockets. A local
attacker could use this to create or listen to NFC traffic.
(CVE-2020-26088)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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-4579-1: linux-image-generic, linux-image-aws, linux-image-4.4.0-1141-raspi2, linux-image-generic-lts-xenial, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-1082-kvm, linux-image-4.4.0-193-generic, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-image-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-image-snapdragon, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-generic-lpae-lts-vivid, linux-image-powerpc64-emb-lts-utopic, linux-kvm, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-4.4.0-1145-snapdragon, linux-lts-xenial, linux-image-kvm, linux-image-powerpc64-smp, linux-image-4.4.0-193-powerpc-e500mc, linux-image-4.4.0-193-powerpc64-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-193-powerpc64-emb, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1081-aws, linux-image-powerpc64-smp-lts-utopic, linux, linux-image-powerpc64-smp-lts-wily, linux-image-virtual-lts-utopic, linux-image-4.4.0-193-lowlatency, linux-image-4.4.0-1117-aws, linux-image-4.4.0-193-generic-lpae, linux-image-4.4.0-193-powerpc-smp, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-wily, linux-image-lowlatency, linux-image-powerpc-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-raspi2, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-lowlatency-lts-utopic, linux-aws, linux-image-virtual-lts-wily, linux-snapdragon, linux-image-virtual, linux-image-powerpc-e500mc, linux-image-generic-lts-utopic
  • USN-4525-1: linux-image-generic, linux-image-5.4.0-1019-raspi, linux-image-generic-lpae-hwe-18.04-edge, linux-azure, linux-image-aws, linux-image-generic-hwe-20.04, linux-image-5.4.0-1026-azure, linux-image-gcp-edge, linux-gcp-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-raspi2, linux-image-gke, linux-image-5.4.0-48-lowlatency, linux-image-snapdragon-hwe-18.04-edge, linux-image-oem-osp1, linux-raspi, linux-image-raspi, linux-hwe-5.4, linux-image-aws-edge, linux-image-virtual-hwe-20.04, linux-image-raspi-hwe-18.04, linux-kvm, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-48-generic, linux-image-oracle-edge, linux-image-5.4.0-48-generic-lpae, linux-image-raspi-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-azure-5.4, linux-image-virtual-hwe-18.04-edge, linux-image-kvm, linux-image-5.4.0-1025-oracle, linux-image-azure-edge, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux, linux-image-oem, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1024-kvm, linux-image-oracle, linux-image-lowlatency, linux-image-lowlatency-hwe-20.04, linux-image-azure, linux-image-gcp, linux-image-generic-lpae, linux-gcp, linux-aws-5.4, linux-aws, linux-image-lowlatency-hwe-18.04-edge, linux-raspi-5.4, linux-image-generic-hwe-18.04, linux-oracle-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-virtual, linux-image-5.4.0-1025-gcp, linux-image-5.4.0-1025-aws
  • USN-4527-1: linux-image-generic, linux-image-aws, linux-image-4.4.0-190-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-emb-lts-wily, linux-image-raspi2, linux-image-virtual-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-image-snapdragon, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1080-kvm, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-1139-raspi2, linux-image-4.4.0-1078-aws, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-190-generic, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux-kvm, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-4.4.0-190-powerpc-smp, linux-lts-xenial, linux-image-kvm, linux-image-powerpc64-smp, linux-image-4.4.0-190-powerpc64-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-1143-snapdragon, linux, linux-image-4.4.0-1114-aws, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-190-lowlatency, linux-image-virtual-lts-utopic, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-wily, linux-image-lowlatency, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-190-powerpc64-emb, linux-image-virtual-lts-vivid, linux-raspi2, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-4.4.0-190-generic-lpae, linux-image-lowlatency-lts-utopic, linux-aws, linux-snapdragon, linux-image-virtual, linux-image-powerpc-e500mc, linux-image-generic-lts-utopic
  • USN-4752-1: linux-image-5.6.0-1048-oem, linux-image-oem-20.04, linux-oem-5.6
  • USN-4576-1: linux-image-generic, linux-image-generic-lpae-hwe-18.04-edge, linux-azure, linux-image-5.4.0-1026-kvm, linux-image-aws, linux-image-5.4.0-1028-gcp, linux-image-generic-hwe-20.04, linux-image-5.4.0-1028-aws, linux-image-gcp-edge, linux-image-generic-lpae-hwe-18.04, linux-gcp-5.4, linux-image-raspi2, linux-image-5.4.0-1021-raspi, linux-image-gke, linux-image-snapdragon-hwe-18.04-edge, linux-image-oem-osp1, linux-raspi, linux-image-raspi, linux-hwe-5.4, linux-image-5.4.0-51-generic-lpae, linux-image-aws-edge, linux-image-raspi-hwe-18.04, linux-image-virtual-hwe-20.04, linux-kvm, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-1028-oracle, linux-image-5.4.0-51-generic, linux-image-oracle-edge, linux-image-raspi-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-azure-5.4, linux-image-virtual-hwe-18.04-edge, linux-image-kvm, linux-image-azure-edge, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux, linux-image-oem, linux-image-virtual-hwe-18.04, linux-image-oracle, linux-image-lowlatency, linux-image-lowlatency-hwe-20.04, linux-image-azure, linux-image-gcp, linux-image-generic-lpae, linux-gcp, linux-image-5.4.0-51-lowlatency, linux-aws-5.4, linux-aws, linux-image-lowlatency-hwe-18.04-edge, linux-raspi-5.4, linux-image-5.4.0-1031-azure, linux-image-generic-hwe-18.04, linux-oracle-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-virtual
  • USN-4577-1: linux-image-5.3.0-68-generic, linux-image-oem-osp1, linux-image-5.3.0-1035-raspi2, linux-hwe, linux-image-5.0.0-1069-oem-osp1, linux-image-raspi2-hwe-18.04, linux-image-gke-5.3, linux-image-5.0.0-1049-gke, linux-gke-5.0, linux-image-gkeop-5.3, linux-oem-osp1, linux-gke-5.3, linux-raspi2-5.3, linux-image-5.3.0-68-lowlatency, linux-image-gke-5.0, linux-image-5.3.0-1038-gke
  • USN-4580-1: linux-image-generic, linux-image-3.2.0-149-powerpc64-smp, linux-image-3.2.0-149-generic-pae, linux-image-omap, linux-image-3.13.0-182-powerpc64-smp, linux-image-generic-lts-trusty, linux-image-generic-pae, linux-image-3.13.0-182-powerpc-smp, linux-image-generic-lpae-lts-saucy, linux-image-3.13.0-182-powerpc-e500, linux-image-3.13.0-182-generic-lpae, linux-image-3.13.0-182-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-highbank, linux-image-generic-lts-saucy, linux-image-3.2.0-149-highbank, linux-image-3.2.0-149-omap, linux-image-3.2.0-149-virtual, linux-image-generic-lts-quantal, linux-image-powerpc64-smp, linux-image-server, linux-image-generic-lpae-lts-trusty, linux-image-powerpc-e500, linux, linux-image-3.2.0-149-generic, linux-image-3.13.0-182-lowlatency, linux-image-3.13.0-182-powerpc64-emb, linux-image-3.2.0-149-powerpc-smp, linux-image-lowlatency, linux-image-powerpc, linux-image-generic-lpae, linux-image-lowlatency-pae, linux-image-generic-lts-raring, linux-image-powerpc-smp, linux-lts-trusty, linux-image-virtual, linux-image-powerpc-e500mc, linux-image-3.13.0-182-generic
  • LSN-0072-1: generic-4.15, lowlatency-4.15, aws, lowlatency-5.4, lowlatency-4.4, azure, generic-4.4, generic-5.4, gcp, oem