1. Ubuntu Security Notices
  2. USN-6342-1

USN-6342-1: Linux kernel vulnerabilities

Publication date

6 September 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-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems

Details

Tavis Ormandy discovered that some AMD processors did not properly handle
speculative execution of certain vector register instructions. A local
attacker could use this to expose sensitive information. (CVE-2023-20593)

Zheng Zhang discovered that the device-mapper implementation in the Linux
kernel did not properly handle locking during table_clear() operations. A
local attacker could use this to cause a denial of service (kernel
deadlock). (CVE-2023-2269)

It was discovered that a use-after-free vulnerability existed in the HFS+
file system implementation in the Linux kernel. A local attacker could
possibly use this to cause a denial of service (system crash).
(CVE-2023-2985)

It was discovered that the DVB Core driver in the Linux kernel did not
properly handle locking events in certain situations. A local...

Tavis Ormandy discovered that some AMD processors did not properly handle
speculative execution of certain vector register instructions. A local
attacker could use this to expose sensitive information. (CVE-2023-20593)

Zheng Zhang discovered that the device-mapper implementation in the Linux
kernel did not properly handle locking during table_clear() operations. A
local attacker could use this to cause a denial of service (kernel
deadlock). (CVE-2023-2269)

It was discovered that a use-after-free vulnerability existed in the HFS+
file system implementation in the Linux kernel. A local attacker could
possibly use this to cause a denial of service (system crash).
(CVE-2023-2985)

It was discovered that the DVB Core driver in the Linux kernel did not
properly handle locking events in certain situations. A local attacker
could use this to cause a denial of service (kernel deadlock).
(CVE-2023-31084)

It was discovered that the Quick Fair Queueing network 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-2023-3611)

It was discovered that the network packet classifier with
netfilter/firewall marks implementation in the Linux kernel did not
properly handle reference counting, 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-2023-3776)

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
18.04 bionic linux-image-4.15.0-1123-oracle –  4.15.0-1123.134  
linux-image-4.15.0-1144-kvm –  4.15.0-1144.149  
linux-image-4.15.0-1154-gcp –  4.15.0-1154.171  
linux-image-4.15.0-1160-aws –  4.15.0-1160.173  
linux-image-4.15.0-216-generic –  4.15.0-216.227  
linux-image-4.15.0-216-lowlatency –  4.15.0-216.227  
linux-image-aws-lts-18.04 –  4.15.0.1160.158  
linux-image-gcp-lts-18.04 –  4.15.0.1154.168  
linux-image-generic –  4.15.0.216.200  
linux-image-kvm –  4.15.0.1144.135  
linux-image-lowlatency –  4.15.0.216.200  
linux-image-oracle-lts-18.04 –  4.15.0.1123.128  
linux-image-virtual –  4.15.0.216.200  
16.04 xenial linux-image-4.15.0-1123-oracle –  4.15.0-1123.134~16.04.1  
linux-image-4.15.0-1154-gcp –  4.15.0-1154.171~16.04.1  
linux-image-4.15.0-1160-aws –  4.15.0-1160.173~16.04.1  
linux-image-4.15.0-216-generic –  4.15.0-216.227~16.04.1  
linux-image-4.15.0-216-lowlatency –  4.15.0-216.227~16.04.1  
linux-image-aws-hwe –  4.15.0.1160.143  
linux-image-gcp –  4.15.0.1154.144  
linux-image-generic-hwe-16.04 –  4.15.0.216.200~16.04.1  
linux-image-gke –  4.15.0.1154.144  
linux-image-lowlatency-hwe-16.04 –  4.15.0.216.200~16.04.1  
linux-image-oem –  4.15.0.216.200~16.04.1  
linux-image-oracle –  4.15.0.1123.104  
linux-image-virtual-hwe-16.04 –  4.15.0.216.200~16.04.1  

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References

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