USN-6533-1: Linux kernel (OEM) vulnerabilities
5 December 2023
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-oem-6.1 - Linux kernel for OEM systems
Details
Tom Dohrmann discovered that the Secure Encrypted Virtualization (SEV)
implementation for AMD processors in the Linux kernel contained a race
condition when accessing MMIO registers. A local attacker in a SEV guest VM
could possibly use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2023-46813)
It was discovered that the io_uring subsystem in the Linux kernel contained
a race condition, leading to a null pointer dereference vulnerability. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2023-46862)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04
-
linux-image-6.1.0-1027-oem
-
6.1.0-1027.27
-
linux-image-oem-22.04
-
6.1.0.1027.28
-
linux-image-oem-22.04a
-
6.1.0.1027.28
-
linux-image-oem-22.04b
-
6.1.0.1027.28
-
linux-image-oem-22.04c
-
6.1.0.1027.28
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.