Security readout for executives and security teams
Plain-English summary
A Linux AMD graphics driver cleanup flaw can leave an invalid I2C device registered after a GPU is disconnected from the driver. Later access may crash the kernel through a null pointer dereference. Exploitation requires local, low-privileged access; the supplied evidence does not establish remote or active exploitation.
Executive priority
Treat as a high-priority local kernel stability issue on applicable AMD GPU systems, especially multi-user or shared workloads. Patch through normal emergency kernel processes after confirming exposure. Internet-facing status alone does not increase exploitability because the supplied vector is local.
Technical view
The AMD display driver fails to unregister an OEM I2C adapter when GPU unbinding finishes. Applications accessing the stale device can trigger a CWE-476 null pointer dereference. The supplied CVSS 3.1 score is 7.8 with a local, low-privilege, no-user-interaction vector. Kernel stable commits are cited as fixes.
Likely exposure
Exposure is limited to Linux systems using the relevant AMD display and OEM I2C functionality where GPU unbinding can occur. The bundle lists versions 6.15, 6.16.8, and 6.17, but its version data includes an ambiguous “0”; confirm exact affected ranges with Linux or distribution guidance.
Exploitation context
CISA KEV status is false, and the supplied sources provide no evidence of exploitation in the wild or a public exploit. The documented trigger requires local access, GPU unbinding, and subsequent access to the invalid device. The description directly supports a kernel crash; broader confidentiality or integrity impact is not demonstrated.
Researcher notes
The affected-version representation is incomplete or ambiguous, so commit containment and distribution advisories are more reliable than raw version matching. Although the CVSS vector claims high confidentiality, integrity, and availability impact, the provided technical description specifically demonstrates a stale device and null pointer dereference, most clearly supporting denial of service.
Mitigation direction
- Update to a vendor-supported kernel containing one of the cited stable fixes.
- Check Linux distribution advisories for exact affected and corrected package versions.
- Prioritize shared systems where unprivileged users can access relevant graphics or I2C devices.
- Restrict unnecessary local access to relevant device interfaces until updates are applied.
Validation and detection
- Inventory kernel versions and identify systems using the AMD display driver.
- Confirm whether the running kernel contains either cited stable fix commit.
- Check distribution package changelogs for CVE-2025-39906 backports.
- Review kernel logs for null pointer faults associated with GPU unbinding or I2C access.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-39906 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/c686124bcf06253620790857ff462f00f3f7a4abCVE reference, Linux
- https://git.kernel.org/stable/c/1dfd2864a1c4909147663e5a27c055f50f7c2796CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.