CVE-2025-39836

Published Sep 16, 2025

Last updated 3 months ago

CVSS high 7.8

Overview

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().
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Modified
Products
linux_kernel

Risk scores

CVSS 3.1

Type
Primary
Base score
7.8
Impact score
5.9
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
CWE-787
134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-787

Social media

Hype score
Not currently trending

  1. 🔵 #Linux Kernel, Buffer Allocation Vulnerability, #CVE-2025-39836 https://t.co/EsCCmSyHcv

    @dailycve

    1 Dec 2025

    44 Impressions

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  2. CVE-2025-39836 In the Linux kernel, the following vulnerability has been resolved: efi https://t.co/lEwi5friGo

    @VulmonFeeds

    16 Sept 2025

    10 Impressions

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  3. CVE-2025-39836 In the Linux kernel, the following vulnerability has been resolved: efi: stmm: Fix incorrect buffer allocation method The communication buffer allocated by setup_mm… https://t.co/qNTODyrwKO

    @CVEnew

    16 Sept 2025

    80 Impressions

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.