CVE-2025-39836

HIGH EPSS 3.9%
Published Sep 16, 20259mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Sep 16, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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().

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
3.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥6.8  –  <6.12.45
linuxlinux_kernel*≥6.13  –  <6.16.5
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff
    Patch