CVE-2025-39707

Local kernel crash via unchecked HUBBUB pointer

Published Sep 5, 2025 · Updated May 11, 2026

NULL pointer dereference in the AMDGPU debugfs interface in Linux kernel 4.15 and later allows local users to crash the kernel. The amdgpu_dm_capabilities read path dereferences the HUBBUB pointer even though DCE hardware leaves that structure uninitialized. DCE hardware and access to the normally root-only debugfs tree are required; the documented consequence is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the AMDGPU debugfs interface in Linux kernel 4.15 and later allows local users to crash the kernel. The amdgpu_dm_capabilities read path dereferences the HUBBUB pointer even though DCE hardware leaves that structure uninitialized. DCE hardware and access to the normally root-only debugfs tree are required; the documented consequence is availability loss only.

The record

CVE
CVE-2025-39707
Published
Sep 5, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.15
  2. Affected versionversion=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <83cfdc2b018cd9c0f927b781d4e07c0d4a911fac
  3. Affected versionversion=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <98e92fceb9507901e3e8b550e93b843306abd354
  4. Affected versionversion=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <b4a69f7f29c8a459ad6b4d8a8b72450f1d9fd288

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <83cfdc2b018cd9c0f927b781d4e07c0d4a911fac; version=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <98e92fceb9507901e3e8b550e93b843306abd354; version=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c <b4a69f7f29c8a459ad6b4d8a8b72450f1d9fd288

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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