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CVE-2025-39836

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: efi: stmm: Fix incorrect buffer allocation method The communication buffer allocated by setup_mm_hdr() is later on passed to te…

Published Sep 16, 2025CWE-787EPSS 0.15%

Overview

CVE-2025-39836 is a high-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

efi: stmm: Fix incorrect buffer allocation method

The communication buffer allocated by setup_mm_hdr() is later on passed

to tee_shm_register_kernel_buf(). The latter expects those buffers to be

contiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause

various corruptions or BUGs, specifically since commit 9aec2fb0fd5e

("slab: allocate frozen pages"), though it was broken before as well.

Fix this by using alloc_pages_exact() instead of kmalloc().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47Refgit.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3Refgit.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39836?

CVE-2025-39836 is a high-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39836?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39836?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39836?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39836 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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