CVE-2025-39786

Kernel memory disclosure via incorrect channel indexing

Published Sep 11, 2025 · Updated Sep 11, 2025

Out-of-bounds read in Linux 6.14 through 6.16.3 allows local users to disclose kernel memory or crash a system through AD7173 sysfs. The ad7173_set_syscalib_mode, ad7173_get_syscalib_mode, and ad7173_write_syscalib handlers index st->channels with chan->channel instead of its zero-based chan->address. Exploitation requires low-privileged local access and an AD7173-family ADC whose device-tree channel configuration makes those indices diverge.

CVSS severity7.1
High
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

Out-of-bounds read in Linux 6.14 through 6.16.3 allows local users to disclose kernel memory or crash a system through AD7173 sysfs. The ad7173_set_syscalib_mode, ad7173_get_syscalib_mode, and ad7173_write_syscalib handlers index st->channels with chan->channel instead of its zero-based chan->address. Exploitation requires low-privileged local access and an AD7173-family ADC whose device-tree channel configuration makes those indices diverge.

The record

CVE
CVE-2025-39786
Published
Sep 11, 2025
Updated
Sep 11, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=031bdc8aee01b7b298159eee541844d8bff4467d <0eb8d7b25397330beab8ee62c681975b79f37223
  2. Affected versionversion=031bdc8aee01b7b298159eee541844d8bff4467d <2def1a8691eb43654da0ae0d2fdb3722e20262a5
  3. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=031bdc8aee01b7b298159eee541844d8bff4467d <0eb8d7b25397330beab8ee62c681975b79f37223; version=031bdc8aee01b7b298159eee541844d8bff4467d <2def1a8691eb43654da0ae0d2fdb3722e20262a5; version=6.14

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5SUSECVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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