Ubuntu LTS 20.04 & 18.04: USN-5668-1 Critical Kernel Threats

ubuntu

October 10, 2022

Several security issues were fixed in the Linux kernel.

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-bluefield: Linux kernel for NVIDIA BlueField platforms

- 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-oracle: Linux kernel for Oracle Cloud systems

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

- linux-ibm-5.4: Linux kernel for IBM cloud systems

Details:

It was discovered that the BPF verifier in the Linux kernel did not

properly handle internal data structures. A local attacker could use this

to expose sensitive information (kernel memory). (CVE-2021-4159)

It was discovered that an out-of-bounds write vulnerability existed in the

Video for Linux 2 (V4L2) implementation in the Linux ke...

Read the Full Advisory

Topics Covered

security advisory critical Ubuntu doS kernel attack memory exposure

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1034-ibm      5.4.0-1034.38
   linux-image-5.4.0-1047-bluefield  5.4.0-1047.52
   linux-image-5.4.0-1054-gkeop    5.4.0-1054.57
   linux-image-5.4.0-1076-kvm      5.4.0-1076.81
   linux-image-5.4.0-1084-gke      5.4.0-1084.90
   linux-image-5.4.0-1084-oracle   5.4.0-1084.92
   linux-image-5.4.0-1086-aws      5.4.0-1086.93
   linux-image-5.4.0-128-generic   5.4.0-128.144
   linux-image-5.4.0-128-generic-lpae  5.4.0-128.144
   linux-image-5.4.0-128-lowlatency  5.4.0-128.144
   linux-image-aws-lts-20.04       5.4.0.1086.86
   linux-image-bluefield           5.4.0.1047.46
   linux-image-generic             5.4.0.128.129
   linux-image-generic-lpae        5.4.0.128.129
   linux-image-gke                 5.4.0.1084.92
   linux-image-gke-5.4             5.4.0.1084.92
   linux-image-gkeop               5.4.0.1054.55
   linux-image-gkeop-5.4           5.4.0.1054.55
   linux-image-ibm                 5.4.0.1034.63
   linux-image-ibm-lts-20.04       5.4.0.1034.63
   linux-image-kvm                 5.4.0.1076.73
   linux-image-lowlatency          5.4.0.128.129
   linux-image-oem                 5.4.0.128.129
   linux-image-oem-osp1            5.4.0.128.129
   linux-image-oracle-lts-20.04    5.4.0.1084.81
   linux-image-virtual             5.4.0.128.129

Ubuntu 18.04 LTS:
   linux-image-5.4.0-1034-ibm      5.4.0-1034.38~18.04.1
   linux-image-5.4.0-128-generic   5.4.0-128.144~18.04.1
   linux-image-5.4.0-128-generic-lpae  5.4.0-128.144~18.04.1
   linux-image-5.4.0-128-lowlatency  5.4.0-128.144~18.04.1
   linux-image-generic-hwe-18.04   5.4.0.128.144~18.04.107
   linux-image-generic-lpae-hwe-18.04  5.4.0.128.144~18.04.107
   linux-image-ibm                 5.4.0.1034.48
   linux-image-lowlatency-hwe-18.04  5.4.0.128.144~18.04.107
   linux-image-oem                 5.4.0.128.144~18.04.107
   linux-image-oem-osp1            5.4.0.128.144~18.04.107
   linux-image-snapdragon-hwe-18.04  5.4.0.128.144~18.04.107
   linux-image-virtual-hwe-18.04   5.4.0.128.144~18.04.107

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.