[USN-7940-1] Linux kernel (Azure FIPS) vulnerabilities
Rodrigo Figueiredo Zaiden
rodrigo.zaiden at canonical.com
Wed Dec 17 21:01:15 UTC 2025
==========================================================================
Ubuntu Security Notice USN-7940-1
December 17, 2025
linux-azure-fips vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 24.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS
Details:
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Cryptographic API;
- ACPI drivers;
- Ublk userspace block driver;
- Clock framework and drivers;
- EDAC drivers;
- GPU drivers;
- HSI subsystem;
- IIO subsystem;
- InfiniBand drivers;
- Media drivers;
- MemoryStick subsystem;
- Network drivers;
- NTB driver;
- PCI subsystem;
- Remote Processor subsystem;
- Thermal drivers;
- Virtio Host (VHOST) subsystem;
- 9P distributed file system;
- File systems infrastructure;
- JFS file system;
- Network file system (NFS) server daemon;
- NTFS3 file system;
- SMB network file system;
- Memory management;
- Bluetooth subsystem;
- RDMA verbs API;
- Kernel fork() syscall;
- Timer subsystem;
- Tracing infrastructure;
- Watch queue notification mechanism;
- Appletalk network protocol;
- Asynchronous Transfer Mode (ATM) subsystem;
- Networking core;
- IPv4 networking;
- IPv6 networking;
- Netfilter;
- Network traffic control;
- SCTP protocol;
- TLS protocol;
- SoC Audio for Freescale CPUs drivers;
(CVE-2023-53034, CVE-2024-58092, CVE-2025-21729, CVE-2025-22018,
CVE-2025-22019, CVE-2025-22020, CVE-2025-22021, CVE-2025-22025,
CVE-2025-22027, CVE-2025-22028, CVE-2025-22033, CVE-2025-22035,
CVE-2025-22036, CVE-2025-22038, CVE-2025-22039, CVE-2025-22040,
CVE-2025-22041, CVE-2025-22042, CVE-2025-22044, CVE-2025-22045,
CVE-2025-22047, CVE-2025-22050, CVE-2025-22053, CVE-2025-22054,
CVE-2025-22055, CVE-2025-22056, CVE-2025-22057, CVE-2025-22058,
CVE-2025-22060, CVE-2025-22062, CVE-2025-22063, CVE-2025-22064,
CVE-2025-22065, CVE-2025-22066, CVE-2025-22068, CVE-2025-22070,
CVE-2025-22071, CVE-2025-22072, CVE-2025-22073, CVE-2025-22075,
CVE-2025-22079, CVE-2025-22080, CVE-2025-22081, CVE-2025-22083,
CVE-2025-22086, CVE-2025-22089, CVE-2025-22090, CVE-2025-22095,
CVE-2025-22097, CVE-2025-23136, CVE-2025-23138, CVE-2025-37838,
CVE-2025-37937, CVE-2025-37958, CVE-2025-38118, CVE-2025-38152,
CVE-2025-38227, CVE-2025-38240, CVE-2025-38352, CVE-2025-38575,
CVE-2025-38616, CVE-2025-38637, CVE-2025-38666, CVE-2025-38678,
CVE-2025-39682, CVE-2025-39728, CVE-2025-39735, CVE-2025-39964,
CVE-2025-39993, CVE-2025-40018, CVE-2025-40114, CVE-2025-40157)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 24.04 LTS
linux-image-6.8.0-1044-azure-fips 6.8.0-1044.50+fips1
Available with Ubuntu Pro
linux-image-azure-fips 6.8.0-1044.50+fips1
Available with Ubuntu Pro
linux-image-azure-fips-6.8 6.8.0-1044.50+fips1
Available with Ubuntu Pro
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.
References:
https://ubuntu.com/security/notices/USN-7940-1
CVE-2023-53034, CVE-2024-58092, CVE-2025-21729, CVE-2025-22018,
CVE-2025-22019, CVE-2025-22020, CVE-2025-22021, CVE-2025-22025,
CVE-2025-22027, CVE-2025-22028, CVE-2025-22033, CVE-2025-22035,
CVE-2025-22036, CVE-2025-22038, CVE-2025-22039, CVE-2025-22040,
CVE-2025-22041, CVE-2025-22042, CVE-2025-22044, CVE-2025-22045,
CVE-2025-22047, CVE-2025-22050, CVE-2025-22053, CVE-2025-22054,
CVE-2025-22055, CVE-2025-22056, CVE-2025-22057, CVE-2025-22058,
CVE-2025-22060, CVE-2025-22062, CVE-2025-22063, CVE-2025-22064,
CVE-2025-22065, CVE-2025-22066, CVE-2025-22068, CVE-2025-22070,
CVE-2025-22071, CVE-2025-22072, CVE-2025-22073, CVE-2025-22075,
CVE-2025-22079, CVE-2025-22080, CVE-2025-22081, CVE-2025-22083,
CVE-2025-22086, CVE-2025-22089, CVE-2025-22090, CVE-2025-22095,
CVE-2025-22097, CVE-2025-23136, CVE-2025-23138, CVE-2025-37838,
CVE-2025-37937, CVE-2025-37958, CVE-2025-38118, CVE-2025-38152,
CVE-2025-38227, CVE-2025-38240, CVE-2025-38352, CVE-2025-38575,
CVE-2025-38616, CVE-2025-38637, CVE-2025-38666, CVE-2025-38678,
CVE-2025-39682, CVE-2025-39728, CVE-2025-39735, CVE-2025-39964,
CVE-2025-39993, CVE-2025-40018, CVE-2025-40114, CVE-2025-40157,
CVE-2025-40300
Package Information:
https://launchpad.net/ubuntu/+source/linux-azure-fips/6.8.0-1044.50+fips1
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