1. Ubuntu Security Notices
  2. USN-6149-1

USN-6149-1: Linux kernel vulnerabilities

Publication date

8 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-kvm - Linux kernel for cloud environments
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

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)

It was discovered that the Human Interface Device (HID) support driver in
the Linux kernel contained a type confusion vulnerability in some
situations. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1073)

Wei Chen discovered that the DVB USB AZ6027 driver in the Linux kernel
contained a null pointer dereference when handling certain messages from
user space. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-28328)

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
16.04 xenial linux-image-4.4.0-241-lowlatency –  4.4.0-241.275  
linux-image-virtual –  4.4.0.241.247  
linux-image-generic –  4.4.0.241.247  
linux-image-lowlatency-lts-xenial –  4.4.0.241.247  
linux-image-aws –  4.4.0.1157.161  
linux-image-4.4.0-1157-aws –  4.4.0-1157.172  
linux-image-virtual-lts-xenial –  4.4.0.241.247  
linux-image-generic-lts-xenial –  4.4.0.241.247  
linux-image-4.4.0-241-generic –  4.4.0-241.275  
linux-image-4.4.0-1120-kvm –  4.4.0-1120.130  
linux-image-kvm –  4.4.0.1120.117  
linux-image-lowlatency –  4.4.0.241.247  
14.04 trusty linux-image-generic-lts-xenial –  4.4.0.241.209  
linux-image-4.4.0-241-lowlatency –  4.4.0-241.275~14.04.1  
linux-image-4.4.0-241-generic –  4.4.0-241.275~14.04.1  
linux-image-lowlatency-lts-xenial –  4.4.0.241.209  
linux-image-4.4.0-1119-aws –  4.4.0-1119.125  
linux-image-aws –  4.4.0.1119.116  
linux-image-virtual-lts-xenial –  4.4.0.241.209  

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References

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