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Ubuntu 24.04: Linux Kernel Azure FIPS Critical Info Exposure CVE-2025-40300

ubuntu
Calendar Grey December 17, 2025
Dist Ubuntu Esm H88
Several issues fixed in Linux kernel Azure FIPS for Ubuntu 24.04, includes critical risks and exposure potential.
Several security issues were fixed in the Linux kernel.

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 drive...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical Ubuntu information exposure linux-azure-fips guest vm

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7940-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu information exposure linux-azure-fips guest vm

Package Information

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