USN-6573-1: Linux kernel (Azure) vulnerabilities
9 January 2024
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
Details
Lucas Leong discovered that the netfilter subsystem in the Linux kernel did
not properly validate some attributes passed from userspace. A local
attacker could use this to cause a denial of service (system crash) or
possibly expose sensitive information (kernel memory). (CVE-2023-39189)
Kyle Zeng discovered that the IPv4 implementation in the Linux kernel did
not properly handle socket buffers (skb) when performing IP routing in
certain circumstances, leading to a null pointer dereference vulnerability.
A privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-42754)
Yikebaer Aizezi discovered that the ext4 file system implementation in the
Linux kernel contained a use-after-free vulnerability when handling inode
extent metadata. An attacker could use this to construct a malicious ext4
file system image that, when mounted, could cause a denial of service
(system crash). (CVE-2023-45898)
Jason Wang discovered that the virtio ring implementation in the Linux
kernel did not properly handle iov buffers in some situations. A local
attacker in a guest VM could use this to cause a denial of service (host
system crash). (CVE-2023-5158)
Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel
did not properly handle queue initialization failures in certain
situations, leading to a use-after-free vulnerability. A remote attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-5178)
Budimir Markovic discovered that the perf subsystem in the Linux kernel did
not properly handle event groups, leading to 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-2023-5717)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 23.10
-
linux-image-6.5.0-1010-azure
-
6.5.0-1010.10
-
linux-image-6.5.0-1010-azure-fde
-
6.5.0-1010.10
-
linux-image-azure
-
6.5.0.1010.12
-
linux-image-azure-fde
-
6.5.0.1010.12
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.