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Ubuntu: Linux Kernel Azure Critical Data Integrity Threat 7934-1

ubuntu
Calendar Grey December 15, 2025
Dist Ubuntu Esm H88
Several security flaws in the Ubuntu Linux kernel fixed in the latest update, enhancing data integrity and system protection.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-azure-6.14: Linux kernel for Microsoft Azure cloud systems

Details:

It was discovered that improper initialization of CPU cache memory could

allow a local attacker with hypervisor access to overwrite SEV-SNP guest

memory resulting in loss of data integrity. (CVE-2024-36331)

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;

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu kernel data integrity information exposure linux

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
   linux-image-6.14.0-1017-azure   6.14.0-1017.17
   linux-image-azure               6.14.0-1017.17
   linux-image-azure-6.14          6.14.0-1017.17

Ubuntu 24.04 LTS
   linux-image-6.14.0-1017-azure   6.14.0-1017.17~24.04.1
   linux-image-azure               6.14.0-1017.17~24.04.1
   linux-image-azure-6.14          6.14.0-1017.17~24.04.1

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-7934-1

CVE-2024-36331, CVE-2025-38335, CVE-2025-38349, CVE-2025-38351,

CVE-2025-38437, CVE-2025-38438, CVE-2025-38439, CVE-2025-38440,

CVE-2025-38441, CVE-2025-38443, CVE-2025-38444, CVE-2025-38445,

CVE-2025-38446, CVE-2025-38448, CVE-2025-38449, CVE-2025-38450,

CVE-2025-38451, CVE-2025-38452, CVE-2025-38453, CVE-2025-38454,

CVE-2025-38455, CVE-2025-38456, CVE-2025-38457, CVE-2025-38458,

CVE-2025-38459, CVE-2025-38460, CVE-2025-38461, CVE-2025-38462,

CVE-2025-38463, CVE-2025-38464, CVE-2025-38465, CVE-2025-38466,

CVE-2025-38467, CVE-2025-38468, CVE-2025-38469, CVE-2025-38470,

CVE-2025-38471, CVE-2025-38472, CVE-2025-38473, CVE-2025-38474,

CVE-2025-38475, CVE-2025-38476, CVE-2025-38478, CVE-2025-38480,

CVE-2025-38481, CVE-2025-38482, CVE-2025-38483, CVE-2025-38484,

CVE-2025-38485, CVE-2025-38487, CVE-2025-38488, CVE-2025-38489,

CVE-2025-38490, CVE-2025-38491, CVE-2025-38492, CVE-2025-38493,

CVE-2025-38494, CVE-2025-38495, CVE-2025-38496, CVE-2025-38497,

CVE-2025-38501, CVE-2025-38503, CVE-2025-38505, CVE-2025-38506,

CVE-2025-38507, CVE-2025-38508, CVE-2025-38509, CVE-2025-38510,

CVE-2025-38511, CVE-2025-38512, CVE-2025-38513, CVE-2025-38514,

CVE-2025-38515, CVE-2025-38516, CVE-2025-38517, CVE-2025-38520,

CVE-2025-38521, CVE-2025-38524, CVE-2025-38525, CVE-2025-38526,

CVE-2025-38527, CVE-2025-38528, CVE-2025-38529, CVE-2025-38530,

CVE-2025-38531, CVE-2025-38532, CVE-2025-38533, CVE-2025-38534,

CVE-2025-38535, CVE-2025-38537, CVE-2025-38538, CVE-2025-38539,

CVE-2025-38540, CVE-2025-38542, CVE-2025-38543, CVE-2025-38544,

CVE-2025-38545, CVE-2025-38546, CVE-2025-38547, CVE-2025-38548,

CVE-2025-38549, CVE-2025-38550, CVE-2025-38551, CVE-2025-38552,

CVE-2025-38553, CVE-2025-38555, CVE-2025-38556, CVE-2025-38557,

CVE-2025-38558, CVE-2025-38559, CVE-2025-38560, CVE-2025-38561,

CVE-2025-38562, CVE-2025-38563, CVE-2025-38565, CVE-2025-38566,

CVE-2025-38567, CVE-2025-38568, CVE-2025-38569, CVE-2025-38570,

CVE-2025-38571, CVE-2025-38572, CVE-2025-38573, CVE-2025-38574,

CVE-2025-38576, CVE-2025-38577, CVE-2025-38578, CVE-2025-38579,

CVE-2025-38581, CVE-2025-38582, CVE-2025-38583, CVE-2025-38584,

CVE-2025-38585, CVE-2025-38586, CVE-2025-38587, CVE-2025-38588,

CVE-2025-38589, CVE-2025-38590, CVE-2025-38593, CVE-2025-38595,

CVE-2025-38601, CVE-2025-38602, CVE-2025-38604, CVE-2025-38605,

CVE-2025-38606, CVE-2025-38608, CVE-2025-38609, CVE-2025-38610,

CVE-2025-38612, CVE-2025-38615, CVE-2025-38616, CVE-2025-38619,

CVE-2025-38622, CVE-2025-38623, CVE-2025-38624, CVE-2025-38625,

CVE-2025-38626, CVE-2025-38628, CVE-2025-38629, CVE-2025-38630,

CVE-2025-38631, CVE-2025-38632, CVE-2025-38634, CVE-2025-38635,

CVE-2025-38639, CVE-2025-38640, CVE-2025-38642, CVE-2025-38643,

CVE-2025-38644, CVE-2025-38645, CVE-2025-38646, CVE-2025-38648,

CVE-2025-38649, CVE-2025-38650, CVE-2025-38652, CVE-2025-38653,

CVE-2025-38654, CVE-2025-38655, CVE-2025-38659, CVE-2025-38660,

CVE-2025-38662, CVE-2025-38663, CVE-2025-38664, CVE-2025-38665,

CVE-2025-38666, CVE-2025-38668, CVE-2025-38670, CVE-2025-38671,

CVE-2025-38675, CVE-2025-38678, CVE-2025-39725, CVE-2025-39726,

CVE-2025-39727, CVE-2025-39730, CVE-2025-39731, CVE-2025-39732,

CVE-2025-39734, CVE-2025-39809, CVE-2025-39818, CVE-2025-39946,

CVE-2025-39964, CVE-2025-39993, CVE-2025-40018, CVE-2025-40157,

CVE-2025-40300

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7934-1

Topics%20covered

Topics Covered

security advisory Ubuntu kernel data integrity information exposure linux

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/6.14.0-1017.17
https://launchpad.net/ubuntu/+source/linux-azure-6.14/6.14.0-1017.17~24.04.1

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