1. Ubuntu Security Notices
  2. USN-6045-1

USN-6045-1: Linux kernel vulnerabilities

Publication date

26 April 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

It was discovered that the Traffic-Control Index (TCINDEX) implementation
in the Linux kernel did not properly perform filter deactivation in some
situations. A local attacker could possibly use this to gain elevated
privileges. Please note that with the fix for this CVE, kernel support for
the TCINDEX classifier has been removed. (CVE-2023-1829)

Gwnaun Jung discovered that the SFB packet scheduling implementation in the
Linux kernel contained 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-2022-3586)

Zheng Wang and Zhuorao Yang discovered that the RealTek RTL8712U wireless
driver in the Linux kernel contained a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code....

It was discovered that the Traffic-Control Index (TCINDEX) implementation
in the Linux kernel did not properly perform filter deactivation in some
situations. A local attacker could possibly use this to gain elevated
privileges. Please note that with the fix for this CVE, kernel support for
the TCINDEX classifier has been removed. (CVE-2023-1829)

Gwnaun Jung discovered that the SFB packet scheduling implementation in the
Linux kernel contained 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-2022-3586)

Zheng Wang and Zhuorao Yang discovered that the RealTek RTL8712U wireless
driver in the Linux kernel contained 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-2022-4095)

It was discovered that the TIPC protocol implementation in the Linux kernel
did not properly validate the queue of socket buffers (skb) when handling
certain UDP packets. A remote attacker could use this to cause a denial of
service. (CVE-2023-1390)

It was discovered that the Xircom PCMCIA network device driver in the Linux
kernel did not properly handle device removal events. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2023-1670)

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-virtual –  4.4.0.240.246  
linux-image-generic –  4.4.0.240.246  
linux-image-lowlatency-lts-xenial –  4.4.0.240.246  
linux-image-aws –  4.4.0.1156.160  
linux-image-4.4.0-240-lowlatency –  4.4.0-240.274  
linux-image-virtual-lts-xenial –  4.4.0.240.246  
linux-image-4.4.0-1156-aws –  4.4.0-1156.171  
linux-image-generic-lts-xenial –  4.4.0.240.246  
linux-image-4.4.0-240-generic –  4.4.0-240.274  
linux-image-kvm –  4.4.0.1119.116  
linux-image-4.4.0-1119-kvm –  4.4.0-1119.129  
linux-image-lowlatency –  4.4.0.240.246  
14.04 trusty linux-image-virtual-lts-xenial –  4.4.0.240.208  
linux-image-generic-lts-xenial –  4.4.0.240.208  
linux-image-aws –  4.4.0.1118.115  
linux-image-4.4.0-240-generic –  4.4.0-240.274~14.04.1  
linux-image-4.4.0-240-lowlatency –  4.4.0-240.274~14.04.1  
linux-image-4.4.0-1118-aws –  4.4.0-1118.124  
linux-image-lowlatency-lts-xenial –  4.4.0.240.208  

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References

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