USN-6626-3: Linux kernel (Azure) vulnerabilities
15 February 2024
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-azure-5.15 - Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde - Linux kernel for Microsoft Azure CVM cloud systems
- linux-azure-fde-5.15 - Linux kernel for Microsoft Azure CVM cloud systems
Details
Quentin Minster discovered that a race condition existed in the KSMBD
implementation in the Linux kernel when handling sessions operations. A
remote attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2023-32250, CVE-2023-32252,
CVE-2023-32257)
Marek Marczykowski-Górecki discovered that the Xen event channel
infrastructure implementation in the Linux kernel contained a race
condition. An attacker in a guest VM could possibly use this to cause a
denial of service (paravirtualized device unavailability). (CVE-2023-34324)
Zheng Wang discovered a use-after-free in the Renesas Ethernet AVB driver
in the Linux kernel during device removal. A privileged attacker could use
this to cause a denial of service (system crash). (CVE-2023-35827)
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 Microchip USB Ethernet driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could use this to
cause a denial of service (system crash). (CVE-2023-6039)
It was discovered that the TLS subsystem in the Linux kernel did not
properly perform cryptographic operations in some situations, leading to a
null pointer dereference vulnerability. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2023-6176)
Xingyuan Mo discovered that the netfilter subsystem in the Linux kernel did
not properly handle dynset expressions passed from userspace, leading to a
null pointer dereference vulnerability. A local attacker could use this to
cause a denial of service (system crash). (CVE-2023-6622)
It was discovered that the TIPC protocol implementation in the Linux kernel
did not properly handle locking during tipc_crypto_key_revoke() operations.
A local attacker could use this to cause a denial of service (kernel
deadlock). (CVE-2024-0641)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04
-
linux-image-5.15.0-1056-azure
-
5.15.0-1056.64
-
linux-image-5.15.0-1056-azure-fde
-
5.15.0-1056.64.1
-
linux-image-azure-fde-lts-22.04
-
5.15.0.1056.64.34
-
linux-image-azure-lts-22.04
-
5.15.0.1056.52
Ubuntu 20.04
-
linux-image-5.15.0-1056-azure
-
5.15.0-1056.64~20.04.1
-
linux-image-5.15.0-1056-azure-fde
-
5.15.0-1056.64~20.04.1.1
-
linux-image-azure
-
5.15.0.1056.64~20.04.45
-
linux-image-azure-cvm
-
5.15.0.1056.64~20.04.45
-
linux-image-azure-fde
-
5.15.0.1056.64~20.04.1.34
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.