1. Ubuntu Security Notices
  2. USN-5804-1

USN-5804-1: Linux kernel vulnerabilities

Publication date

13 January 2023

Overview

Several security issues were fixed in the Linux kernel.

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-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-ibm - Linux kernel for IBM cloud systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.4 - Linux kernel for Oracle Cloud systems

Details

It was discovered that the NFSD implementation in the Linux kernel did not
properly handle some RPC messages, leading to a buffer overflow. A remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2022-43945)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was...

It was discovered that the NFSD implementation in the Linux kernel did not
properly handle some RPC messages, leading to a buffer overflow. A remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2022-43945)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was discovered that an integer overflow vulnerability existed in the
Bluetooth subsystem in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2022-45934)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
20.04 focal linux-image-5.4.0-1094-aws –  5.4.0-1094.102
linux-image-virtual –  5.4.0.137.135
linux-image-5.4.0-137-generic –  5.4.0-137.154
linux-image-generic –  5.4.0.137.135
linux-image-oem –  5.4.0.137.135
linux-image-5.4.0-137-lowlatency –  5.4.0-137.154
linux-image-5.4.0-1098-gcp –  5.4.0-1098.107
linux-image-5.4.0-1042-ibm –  5.4.0-1042.47
linux-image-ibm –  5.4.0.1042.68
linux-image-oem-osp1 –  5.4.0.137.135
linux-image-gcp-lts-20.04 –  5.4.0.1098.100
linux-image-ibm-lts-20.04 –  5.4.0.1042.68
linux-image-aws-lts-20.04 –  5.4.0.1094.91
linux-image-generic-lpae –  5.4.0.137.135
linux-image-oracle-lts-20.04 –  5.4.0.1092.85
linux-image-5.4.0-137-generic-lpae –  5.4.0-137.154
linux-image-5.4.0-1092-oracle –  5.4.0-1092.101
linux-image-kvm –  5.4.0.1084.78
linux-image-5.4.0-1084-kvm –  5.4.0-1084.90
linux-image-lowlatency –  5.4.0.137.135
18.04 bionic linux-image-virtual –  4.15.0.202.185
linux-image-generic –  4.15.0.202.185
linux-image-5.4.0-1098-gcp –  5.4.0-1098.107~18.04.1
linux-image-4.15.0-1159-azure –  4.15.0-1159.174
linux-image-4.15.0-202-generic –  4.15.0-202.213
linux-image-azure-lts-18.04 –  4.15.0.1159.127
linux-image-gcp –  5.4.0.1098.74
linux-image-4.15.0-202-generic-lpae –  4.15.0-202.213
linux-image-oracle –  5.4.0.1092.101~18.04.66
linux-image-5.4.0-1092-oracle –  5.4.0-1092.101~18.04.1
linux-image-4.15.0-1134-kvm –  4.15.0-1134.139
linux-image-kvm –  4.15.0.1134.125
linux-image-generic-lpae –  4.15.0.202.185
linux-image-4.15.0-202-lowlatency –  4.15.0-202.213
linux-image-lowlatency –  4.15.0.202.185
16.04 xenial linux-image-lowlatency-hwe-16.04 –  4.15.0.202.187  
linux-image-4.15.0-1143-gcp –  4.15.0-1143.159~16.04.1  
linux-image-oem –  4.15.0.202.187  
linux-image-4.15.0-1148-aws-hwe –  4.15.0-1148.160~16.04.1  
linux-image-4.15.0-202-generic –  4.15.0-202.213~16.04.1  
linux-image-gke –  4.15.0.1143.135  
linux-image-gcp –  4.15.0.1143.135  
linux-image-aws-hwe –  4.15.0.1148.133  
linux-image-generic-hwe-16.04 –  4.15.0.202.187  
linux-image-virtual-hwe-16.04 –  4.15.0.202.187  
linux-image-4.15.0-202-lowlatency –  4.15.0-202.213~16.04.1  
14.04 trusty linux-image-4.15.0-1159-azure –  4.15.0-1159.174~14.04.1  
linux-image-azure –  4.15.0.1159.126  

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References

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