CVE-2025-40032

Kernel panic via NULL DMA channel release

Published Oct 28, 2025 · Updated Oct 28, 2025

NULL-pointer dereference in the Linux PCI endpoint test function allows attackers to panic the kernel during endpoint teardown. The pci_epf_test_clean_dma_chan() function passes dma_chan_tx or dma_chan_rx to dma_release_channel() without first verifying that the selected channel pointer is non-NULL. The crash requires cleanup after PCI endpoint-function initialization leaves at least one DMA channel unavailable, and the published record documents service interruption rather than code execution or data access.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
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 the Linux PCI endpoint test function allows attackers to panic the kernel during endpoint teardown. The pci_epf_test_clean_dma_chan() function passes dma_chan_tx or dma_chan_rx to dma_release_channel() without first verifying that the selected channel pointer is non-NULL. The crash requires cleanup after PCI endpoint-function initialization leaves at least one DMA channel unavailable, and the published record documents service interruption rather than code execution or data access.

The record

CVE
CVE-2025-40032
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=5.7
  2. Affected versionversion=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <0c5ce6b6ccc22d486cc7239ed908cb0ae5363a7b
  3. Affected versionversion=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <57f7fb0d1ac28540c0f6405c829bb9c3b89d8dba
  4. Affected versionversion=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <6411f840a9b5c47c00ca8e004733de232553870d
  5. Affected versionversion=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <85afa9ea122dd9d4a2ead104a951d318975dcd25
  6. Affected versionversion=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <fb54ffd60064c4e5139a3eb216e877b1acae1c8b

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <0c5ce6b6ccc22d486cc7239ed908cb0ae5363a7b; version=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <57f7fb0d1ac28540c0f6405c829bb9c3b89d8dba; version=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <6411f840a9b5c47c00ca8e004733de232553870d; version=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <85afa9ea122dd9d4a2ead104a951d318975dcd25; version=5ebf3fc59bd20d17df3ba26159787d13cf20d362 <fb54ffd60064c4e5139a3eb216e877b1acae1c8b

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.

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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)
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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