🛡️ CVE-2025-40336 — kernel

🟠 CVSS 8.8 — High ✅ No Known Exploit NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

drm/gpusvm: fix hmm_pfn_to_map_order() usage

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

drm/gpusvm: fix hmm_pfn_to_map_order() usage

Handle the case where the hmm range partially covers a huge page (like

2M), otherwise we can potentially end up doing something nasty like

mapping memory which is outside the range, and maybe not even mapped by

the mm. Fix is based on the xe userptr code, which in a future patch

will directly use gpusvm, so needs alignment here.

v2:

  • Add kernel-doc (Matt B)
  • s/fls/ilog2/ (Thomas)

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2025-40336 is recorded against 2 packages.

  • kernel (from 6.15.0 up to 6.17.8)
  • unknown

Timeline and source

Published on 9 December 2025 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-40336 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-09
Updated 2026-08-12
Modified 2026-08-06
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.15.0 6.17.8
unknown — —

Similar Threats

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