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CVE Record

CVE-2025-39934: drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ

In the Linux kernel, the following vulnerability has been resolved: drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ If the interrupt occurs before resource initialization is complete, the interrupt handler/worker may access uninitialized data such as the I2C tcpc_client device, potentially leading to NULL pointer dereference.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel driver bug in the ANX7625 display bridge path. If an interrupt arrives before initialization finishes, the kernel may touch missing driver data and crash that component or system. The sources show it has been fixed in stable kernel commits, but provide no CVSS score or active exploitation evidence.

Executive priority

Prioritize normal kernel maintenance for fleets that include ANX7625-based display hardware. Escalate if affected devices are business-critical, crash during boot, or vendors classify downstream impact as higher. Current public evidence does not support emergency treatment.

Technical view

The drm/bridge/anx7625 interrupt handler or worker can run before resources are fully initialized. It may dereference uninitialized data, including the I2C tcpc_client pointer, causing a NULL pointer dereference. The issue is resolved by Linux stable commits referenced for CVE-2025-39934.

Likely exposure

Exposure is likely limited to Linux systems running affected kernel versions with the ANX7625 DRM bridge driver and relevant hardware enabled. Systems not using this driver or hardware are less likely to be exposed. The source bundle does not identify distributions, appliances, or downstream vendor packages.

Exploitation context

The source bundle does not report active exploitation, and KEV is false. The described failure depends on an interrupt arriving during early driver initialization. Treat it primarily as a kernel stability and availability risk unless vendor advisories provide stronger impact evidence.

Researcher notes

Evidence is narrow and kernel-source based. The core condition is early IRQ handling before resource initialization, producing a NULL dereference. No CWE, CVSS, exploit status, affected distro matrix, or operational workaround is provided in the source bundle.

Mitigation direction

  • Update to a vendor kernel containing the referenced Linux stable fixes.
  • Check your Linux distribution advisory for backported fixed packages.
  • If updating is delayed, review vendor guidance for ANX7625 driver workarounds.
  • Avoid disabling the driver unless the hardware is unused and operations approve it.

Validation and detection

  • Inventory systems for affected Linux kernel versions and ANX7625 driver use.
  • Confirm whether the fixed stable commits are present in your kernel build.
  • Check boot and kernel logs for ANX7625 NULL pointer dereference crashes.
  • Validate patched kernels on hardware that uses the ANX7625 bridge.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2025-39934 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
0ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730, 8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730, 8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730, 8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730, 8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730, 8bdfc5dae4e3ba4d99dfb430ef43249e5f1b7730unaffected
LinuxLinux5.11, 0, 5.15.194, 6.1.154, 6.6.108, 6.12.49, 6.16.9, 6.17affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.