CVE-2025-40034

Kernel crash via unchecked PCIe AER state

Published Oct 28, 2025 · Updated Oct 28, 2025

NULL pointer dereference in Linux 6.16 through 6.17.2 allows attackers to crash the kernel via PCIe AER error reporting. The aer_ratelimit() path passes dev->aer_info ratelimit state to ___ratelimit without checking whether firmware named a device lacking AER capability, leaving that state NULL. The crash requires firmware-originated GHES error data naming such a PCIe device; no remote trigger is established.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux 6.16 through 6.17.2 allows attackers to crash the kernel via PCIe AER error reporting. The aer_ratelimit() path passes dev->aer_info ratelimit state to ___ratelimit without checking whether firmware named a device lacking AER capability, leaving that state NULL. The crash requires firmware-originated GHES error data naming such a PCIe device; no remote trigger is established.

The record

CVE
CVE-2025-40034
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=6.16
  2. Affected versionversion=a57f2bfb4a5863f83087867c0e671f2418212d23 <41683624cbff0a26bb7e0627f4a7e1b51a8779a8
  3. Affected versionversion=a57f2bfb4a5863f83087867c0e671f2418212d23 <deb2f228388ff3a9d0623e3b59a053e9235c341d

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=a57f2bfb4a5863f83087867c0e671f2418212d23 <41683624cbff0a26bb7e0627f4a7e1b51a8779a8; version=a57f2bfb4a5863f83087867c0e671f2418212d23 <deb2f228388ff3a9d0623e3b59a053e9235c341d

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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