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CVE Record

CVE-2025-40015: media: stm32-csi: Fix dereference before NULL check

In the Linux kernel, the following vulnerability has been resolved: media: stm32-csi: Fix dereference before NULL check In 'stm32_csi_start', 'csidev->s_subdev' is dereferenced directly while assigning a value to the 'src_pad'. However the same value is being checked against NULL at a later point of time indicating that there are chances that the value can be NULL. Move the dereference after the NULL check.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE is a Linux kernel driver bug in the STM32 CSI media component. The code used a pointer before confirming it was valid, which could cause a NULL pointer dereference. Business impact is unclear from the sources because no severity, CVSS score, exploit path, or active exploitation is provided.

Executive priority

Track and patch during normal kernel maintenance unless STM32 CSI is used in production devices. Escalate only if vendor scoring, device exposure, or operational testing shows this driver is reachable in critical systems.

Technical view

In stm32_csi_start, csidev->s_subdev was dereferenced while assigning src_pad before the later NULL check. The kernel fix moves the dereference after validation. The issue is in the Linux media stm32-csi driver, with stable kernel fix references provided, but the bundle does not define impact beyond the bad dereference pattern.

Likely exposure

Most relevant to Linux systems that include and use the STM32 CSI media driver, typically embedded or ARM camera-interface deployments. General Linux servers are less likely to be exposed unless this driver is present and reachable. Exact affected branch status should be confirmed against vendor kernel advisories or the referenced stable commits.

Exploitation context

The provided sources do not report active exploitation, public exploit code, KEV listing, privilege impact, or remote attackability. Treat this as a kernel stability and potential denial-of-service concern until vendor guidance or scoring clarifies impact.

Researcher notes

Evidence is limited to the CVE description and three kernel stable references. No CVSS, CWE, exploit status, or detailed affected-version range is included in the bundle. Analysis should focus on driver reachability, exact kernel lineage, and whether the fix is present or backported.

Mitigation direction

  • Update to a Linux kernel containing the referenced stable fixes.
  • Check distribution or device-vendor advisories for backported fixes.
  • Prioritize embedded systems using STM32 CSI camera functionality.
  • Disable unused STM32 CSI support where operationally safe.
  • Do not assume fixed status from version numbers alone.

Validation and detection

  • Inventory Linux systems and devices using STM32 CSI media support.
  • Compare deployed kernel source or packages against the referenced stable commits.
  • Review kernel configuration and device tree usage for stm32-csi.
  • Check vendor security advisories for CVE-2025-40015 backports.
  • Confirm patched builds pass camera-interface regression testing.
Prepared
Confidence
medium
Sources
5

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

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

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CVE-2025-40015 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
4Source 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
LinuxLinuxe7bad98c205d17c745de9d83ebf73e53cbf99d48, e7bad98c205d17c745de9d83ebf73e53cbf99d48, e7bad98c205d17c745de9d83ebf73e53cbf99d48unaffected
LinuxLinux6.15, 0, 6.16.11, 6.17.1, 6.18affected
Weakness

CWE details

No CWE listed

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