CVE-2025-40014

Kernel stack access via unchecked SPI speed

Published Apr 18, 2025 · Updated May 11, 2026

Out-of-bounds access in Linux 6.14 and 6.14.1 allows local users to trigger invalid kernel stack access via a low AMD SPI speed. The amd_set_spi_freq function exhausts the amd_spi_freq array when speed_hz is below AMD_SPI_MIN_HZ, then dereferences the out-of-range index. Access requires local low-privileged control of an AMD SPI transfer; public records demonstrate neither a resulting crash nor code execution.

CVSS severity7.8
High
EPSS probability0.23%
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 access in Linux 6.14 and 6.14.1 allows local users to trigger invalid kernel stack access via a low AMD SPI speed. The amd_set_spi_freq function exhausts the amd_spi_freq array when speed_hz is below AMD_SPI_MIN_HZ, then dereferences the out-of-range index. Access requires local low-privileged control of an AMD SPI transfer; public records demonstrate neither a resulting crash nor code execution.

The record

CVE
CVE-2025-40014
Published
Apr 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, CAPEC-100
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.14
  2. Affected versionversion=e6204f39fe3a7b4538815a2d778b601bd543649e <76e51db43fe4aaaebcc5ddda67b0807f7c9bdecc
  3. Affected versionversion=e6204f39fe3a7b4538815a2d778b601bd543649e <7f2c746e09a3746bf937bc708129dc8af61d8f19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=e6204f39fe3a7b4538815a2d778b601bd543649e <76e51db43fe4aaaebcc5ddda67b0807f7c9bdecc; version=e6204f39fe3a7b4538815a2d778b601bd543649e <7f2c746e09a3746bf937bc708129dc8af61d8f19

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-129Improper Validation of Array Index
CAPEC-100Overflow Buffers

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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