1. Ubuntu Security Notices
  2. USN-6131-1

USN-6131-1: Linux kernel vulnerabilities

Publication date

1 June 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-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - 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-gke - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-ibm - Linux kernel for IBM cloud systems
  • linux-ibm-5.4 - 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

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in
the netfilter subsystem of the Linux kernel when processing batch requests,
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-2023-32233)

Gwangun Jung discovered that the Quick Fair Queueing scheduler
implementation in the Linux kernel contained an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-31436)

Reima Ishii discovered that the nested KVM implementation for Intel x86
processors in the Linux kernel did not properly validate control registers
in certain situations. An attacker in a guest VM could use this to cause a
denial of service (guest crash). (

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in
the netfilter subsystem of the Linux kernel when processing batch requests,
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-2023-32233)

Gwangun Jung discovered that the Quick Fair Queueing scheduler
implementation in the Linux kernel contained an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-31436)

Reima Ishii discovered that the nested KVM implementation for Intel x86
processors in the Linux kernel did not properly validate control registers
in certain situations. An attacker in a guest VM could use this to cause a
denial of service (guest crash). (CVE-2023-30456)

It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux
kernel did not properly perform data buffer size validation in some
situations. A physically proximate attacker could use this to craft a
malicious USB device that when inserted, could cause a denial of service
(system crash) or possibly expose sensitive information. (CVE-2023-1380)

Jean-Baptiste Cayrou discovered that the shiftfs file system in the Ubuntu
Linux kernel contained a race condition when handling inode locking in some
situations. A local attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2023-2612)

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-gcp-lts-20.04 –  5.4.0.1106.108
linux-image-virtual –  5.4.0.150.148
linux-image-5.4.0-1050-ibm –  5.4.0-1050.55
linux-image-generic –  5.4.0.150.148
linux-image-oem –  5.4.0.150.148
linux-image-5.4.0-1109-azure –  5.4.0-1109.115
linux-image-5.4.0-1106-gcp –  5.4.0-1106.115
linux-image-5.4.0-1103-aws –  5.4.0-1103.111
linux-image-5.4.0-1102-oracle –  5.4.0-1102.111
linux-image-ibm –  5.4.0.1050.76
linux-image-oem-osp1 –  5.4.0.150.148
linux-image-5.4.0-150-lowlatency –  5.4.0-150.167
linux-image-azure-lts-20.04 –  5.4.0.1109.102
linux-image-gkeop-5.4 –  5.4.0.1070.68
linux-image-gkeop –  5.4.0.1070.68
linux-image-5.4.0-150-generic –  5.4.0-150.167
linux-image-ibm-lts-20.04 –  5.4.0.1050.76
linux-image-aws-lts-20.04 –  5.4.0.1103.100
linux-image-5.4.0-1070-gkeop –  5.4.0-1070.74
linux-image-gke-5.4 –  5.4.0.1100.105
linux-image-gke –  5.4.0.1100.105
linux-image-kvm –  5.4.0.1092.87
linux-image-oracle-lts-20.04 –  5.4.0.1102.95
linux-image-generic-lpae –  5.4.0.150.148
linux-image-5.4.0-1100-gke –  5.4.0-1100.107
linux-image-5.4.0-150-generic-lpae –  5.4.0-150.167
linux-image-5.4.0-1092-kvm –  5.4.0-1092.98
linux-image-lowlatency –  5.4.0.150.148
18.04 bionic linux-image-snapdragon-hwe-18.04 –  5.4.0.150.167~18.04.121
linux-image-5.4.0-1050-ibm –  5.4.0-1050.55~18.04.1
linux-image-oem –  5.4.0.150.167~18.04.121
linux-image-5.4.0-1109-azure –  5.4.0-1109.115~18.04.1
linux-image-ibm –  5.4.0.1050.61
linux-image-oem-osp1 –  5.4.0.150.167~18.04.121
linux-image-generic-hwe-18.04 –  5.4.0.150.167~18.04.121
linux-image-generic-lpae-hwe-18.04 –  5.4.0.150.167~18.04.121
linux-image-5.4.0-1106-gcp –  5.4.0-1106.115~18.04.1
linux-image-lowlatency-hwe-18.04 –  5.4.0.150.167~18.04.121
linux-image-azure –  5.4.0.1109.82
linux-image-5.4.0-1102-oracle –  5.4.0-1102.111~18.04.1
linux-image-5.4.0-150-generic –  5.4.0-150.167~18.04.1
linux-image-virtual-hwe-18.04 –  5.4.0.150.167~18.04.121
linux-image-gcp –  5.4.0.1106.82
linux-image-5.4.0-150-lowlatency –  5.4.0-150.167~18.04.1
linux-image-oracle –  5.4.0.1102.111~18.04.74
linux-image-5.4.0-150-generic-lpae –  5.4.0-150.167~18.04.1

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References

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