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CVE Record

CVE-2025-39786: iio: adc: ad7173: fix channels index for syscalib_mode

In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad7173: fix channels index for syscalib_mode Fix the index used to look up the channel when accessing the syscalib_mode attribute. The address field is a 0-based index (same as scan_index) that it used to access the channel in the ad7173_channels array throughout the driver. The channels field, on the other hand, may not match the address field depending on the channel configuration specified in the device tree and could result in an out-of-bounds access.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux driver for Analog Devices AD7173-family analog-to-digital converters can select the wrong channel when system calibration mode is accessed. Certain device-tree channel layouts may cause an out-of-bounds kernel access. Exploitation requires local, low-privileged access, but the supplied CVSS assessment indicates potentially serious confidentiality, integrity, and availability impact.

Executive priority

Prioritize affected embedded, industrial, or measurement systems where the ad7173 driver is active and local users are not fully trusted. Treat remediation as high priority, but scope first: this is not described as remotely exploitable, and the bundle provides no active-exploitation evidence.

Technical view

The ad7173 IIO ADC driver used the channels field to index ad7173_channels for syscalib_mode. That field can differ from the zero-based address and scan_index when channels are configured through the device tree. The resulting incorrect index may access memory outside the array. The referenced Linux stable commits correct the lookup index.

Likely exposure

Exposure is limited to Linux systems using the affected ad7173 ADC driver, a channel configuration where channels and address values differ, and access to syscalib_mode. Systems without this driver or relevant hardware configuration are unlikely to be exposed. The supplied version data is ambiguous, so distribution-specific advisories should determine affected builds.

Exploitation context

The CVSS vector describes a local, low-complexity attack requiring low privileges and no user interaction. The source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit. Practical reachability depends on the driver, device-tree configuration, and local access to the affected attribute.

Researcher notes

The vulnerable assumption is that channels can safely index ad7173_channels. The driver otherwise uses address as the zero-based channel index, while device-tree configuration can make channels diverge. Assessment should focus on reachable syscalib_mode paths and configurations producing that mismatch. The supplied affected-version representation is insufficient for a definitive version range.

Mitigation direction

  • Install a vendor kernel containing the referenced stable fix.
  • Backport the referenced index correction when vendor updates are unavailable.
  • Restrict local access to affected systems until remediation is complete.
  • Review Linux distribution guidance for precise affected and fixed package versions.

Validation and detection

  • Confirm whether the ad7173 IIO ADC driver is present and active.
  • Review device-tree channel configuration for differing channel and address indexes.
  • Determine whether untrusted local users can access syscalib_mode.
  • Verify the running kernel includes the referenced stable correction.
  • Use distribution advisories to confirm package-level remediation status.
Prepared
Confidence
high
Sources
4

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.

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CVE-2025-39786 mapping review

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Vulnerability profileCVE Program record
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

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.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2025-39786Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
LinuxLinux031bdc8aee01b7b298159eee541844d8bff4467d, 031bdc8aee01b7b298159eee541844d8bff4467dunaffected
LinuxLinux6.14, 0, 6.16.4, 6.17affected
Weakness

CWE details

No CWE listed

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