A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-5137-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-5137-1
November 09, 2021

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp,
linux-gcp-5.4, linux-gke, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4,
linux-ibm, linux-kvm vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the f2fs file system in the Linux kernel did not
properly validate metadata in some situations. An attacker could use this
to construct a malicious f2fs image that, when mounted and operated on,
could cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-19449)

It was discovered that the Infiniband RDMA userspace connection manager
implementation in the Linux kernel contained a race condition leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possible execute arbitrary code.
(CVE-2020-36385)

Wolfgang Frisch discovered that the ext4 file system implementation in the
Linux kernel contained an integer overflow when handling metadata inode
extents. An attacker could use this to construct a malicious ext4 file
system image that, when mounted, could cause a denial of service (system
crash). (CVE-2021-3428)

Benedict Schlueter discovered that the BPF subsystem in the Linux kernel
did not properly protect against Speculative Store Bypass (SSB) side-
channel attacks in some situations. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-34556)

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly protect against Speculative Store Bypass (SSB) side-channel
attacks in some situations. A local attacker could possibly use this to
expose sensitive information. (CVE-2021-35477)

It was discovered that the btrfs file system in the Linux kernel did not
properly handle removing a non-existent device id. An attacker with
CAP_SYS_ADMIN could use this to cause a denial of service. (CVE-2021-3739)

It was discovered that the Qualcomm IPC Router protocol implementation in
the Linux kernel did not properly validate metadata in some situations. A
local attacker could use this to cause a denial of service (system crash)
or expose sensitive information. (CVE-2021-3743)

It was discovered that the virtual terminal (vt) device implementation in
the Linux kernel contained a race condition in its ioctl handling that led
to an out-of-bounds read vulnerability. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-3753)

It was discovered that the Linux kernel did not properly account for the
memory usage of certain IPC objects. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2021-3759)

It was discovered that the Aspeed Low Pin Count (LPC) Bus Controller
implementation in the Linux kernel did not properly perform boundary checks
in some situations, allowing out-of-bounds write access. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. In Ubuntu, this issue only affected systems running
armhf kernels. (CVE-2021-42252)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1007-ibm 5.4.0-1007.8
linux-image-5.4.0-1026-gkeop 5.4.0-1026.27
linux-image-5.4.0-1049-kvm 5.4.0-1049.51
linux-image-5.4.0-1055-gke 5.4.0-1055.58
linux-image-5.4.0-1057-gcp 5.4.0-1057.61
linux-image-5.4.0-1059-aws 5.4.0-1059.62
linux-image-5.4.0-1063-azure 5.4.0-1063.66
linux-image-5.4.0-90-generic 5.4.0-90.101
linux-image-5.4.0-90-generic-lpae 5.4.0-90.101
linux-image-5.4.0-90-lowlatency 5.4.0-90.101
linux-image-aws-lts-20.04 5.4.0.1059.62
linux-image-azure-lts-20.04 5.4.0.1063.61
linux-image-gcp-lts-20.04 5.4.0.1057.67
linux-image-generic 5.4.0.90.94
linux-image-generic-lpae 5.4.0.90.94
linux-image-gke 5.4.0.1055.65
linux-image-gke-5.4 5.4.0.1055.65
linux-image-gkeop 5.4.0.1026.29
linux-image-gkeop-5.4 5.4.0.1026.29
linux-image-ibm 5.4.0.1007.8
linux-image-ibm-lts-20.04 5.4.0.1007.8
linux-image-kvm 5.4.0.1049.48
linux-image-lowlatency 5.4.0.90.94
linux-image-oem 5.4.0.90.94
linux-image-oem-osp1 5.4.0.90.94
linux-image-virtual 5.4.0.90.94

Ubuntu 18.04 LTS:
linux-image-5.4.0-1026-gkeop 5.4.0-1026.27~18.04.1
linux-image-5.4.0-1057-gcp 5.4.0-1057.61~18.04.1
linux-image-5.4.0-1059-aws 5.4.0-1059.62~18.04.1
linux-image-5.4.0-1063-azure 5.4.0-1063.66~18.04.1
linux-image-5.4.0-90-generic 5.4.0-90.101~18.04.1
linux-image-5.4.0-90-generic-lpae 5.4.0-90.101~18.04.1
linux-image-5.4.0-90-lowlatency 5.4.0-90.101~18.04.1
linux-image-aws 5.4.0.1059.42
linux-image-azure 5.4.0.1063.43
linux-image-gcp 5.4.0.1057.43
linux-image-generic-hwe-18.04 5.4.0.90.101~18.04.80
linux-image-generic-lpae-hwe-18.04 5.4.0.90.101~18.04.80
linux-image-gkeop-5.4 5.4.0.1026.27~18.04.27
linux-image-lowlatency-hwe-18.04 5.4.0.90.101~18.04.80
linux-image-oem 5.4.0.90.101~18.04.80
linux-image-oem-osp1 5.4.0.90.101~18.04.80
linux-image-snapdragon-hwe-18.04 5.4.0.90.101~18.04.80
linux-image-virtual-hwe-18.04 5.4.0.90.101~18.04.80

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:
  https://ubuntu.com/security/notices/USN-5137-1
CVE-2019-19449, CVE-2020-36385, CVE-2021-3428, CVE-2021-34556,
CVE-2021-35477, CVE-2021-3739, CVE-2021-3743, CVE-2021-3753,
CVE-2021-3759, CVE-2021-42252

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.4.0-90.101
  https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1059.62
  https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1063.66
  https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1057.61
  https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1055.58
  https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1026.27
  https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1007.8
  https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1049.51
  https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1059.62~18.04.1
  https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1063.66~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1057.61~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1026.27~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-90.101~18.04.1