CVE-2025-71196

Local system crash via device-tree index

Published Feb 4, 2026 · Updated Feb 4, 2026

Out-of-bounds array access in Linux Kernel 4.17 allows local users to crash STM32-based systems during USB PHY device probing. The STM32 USB PHY probe path accepts a device-tree index equal to usbphyc->nphys because its bounds check uses > instead of >=, then indexes usbphyc->phys[] one element past the array. Exploitation requires local access and a crafted STM32 USB PHY device tree; the bounded consequence is an availability-only kernel crash.

CVSS severity6.8
Medium
EPSS probability0.18%
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 array access in Linux Kernel 4.17 allows local users to crash STM32-based systems during USB PHY device probing. The STM32 USB PHY probe path accepts a device-tree index equal to usbphyc->nphys because its bounds check uses > instead of >=, then indexes usbphyc->phys[] one element past the array. Exploitation requires local access and a crafted STM32 USB PHY device tree; the bounded consequence is an availability-only kernel crash.

The record

CVE
CVE-2025-71196
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record 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=4.17
  2. Affected versionversion=94c358da3a0545205c6c6a50ae26141f1c73acfa <76b870fdaad82171a24b8aacffe5e4d9e0d2ee2c
  3. Affected versionversion=94c358da3a0545205c6c6a50ae26141f1c73acfa <7c27eaf183563b86d815ff6e9cca0210b4cfa051
  4. Affected versionversion=94c358da3a0545205c6c6a50ae26141f1c73acfa <b91c9f6bfb04e430adeeac7e7ebc9d80f9d72bad
  5. Affected versionversion=94c358da3a0545205c6c6a50ae26141f1c73acfa <cabd25b57216ddc132efbcc31f972baa03aad15a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.17; version=94c358da3a0545205c6c6a50ae26141f1c73acfa <76b870fdaad82171a24b8aacffe5e4d9e0d2ee2c; version=94c358da3a0545205c6c6a50ae26141f1c73acfa <7c27eaf183563b86d815ff6e9cca0210b4cfa051; version=94c358da3a0545205c6c6a50ae26141f1c73acfa <b91c9f6bfb04e430adeeac7e7ebc9d80f9d72bad; version=94c358da3a0545205c6c6a50ae26141f1c73acfa <cabd25b57216ddc132efbcc31f972baa03aad15a

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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