USN-6051-1: Linux kernel vulnerabilities
1 May 2023
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-azure-5.15 - Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde - Linux kernel for Microsoft Azure CVM cloud systems
- linux-kvm - Linux kernel for cloud environments
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)
It was discovered that a race condition existed in the io_uring subsystem
in the Linux kernel, 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-2023-1872)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04
-
linux-image-5.15.0-1032-kvm
-
5.15.0-1032.37
-
linux-image-5.15.0-1037-azure-fde
-
5.15.0-1037.44.1
-
linux-image-azure-fde
-
5.15.0.1037.44.14
-
linux-image-kvm
-
5.15.0.1032.28
Ubuntu 20.04
-
linux-image-azure
-
5.15.0.1037.44~20.04.27
-
linux-image-5.15.0-1037-azure
-
5.15.0-1037.44~20.04.1
-
linux-image-azure-cvm
-
5.15.0.1037.44~20.04.27
After a standard system update you need to reboot your computer to make
all the necessary changes.
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.