CVE-2025-39841Network attack vector

Kernel memory corruption via deferred RQ buffer race

Published Sep 19, 2025 · Updated Sep 19, 2025

Use-after-free in the Linux lpfc driver allows remote attackers to corrupt kernel memory through a deferred receive race. The deferred receive path frees the RQ buffer before clearing the shared context pointer under lock, letting concurrent ABTS or repost handling release it again. Exploitation requires an active lpfc Fibre Channel target path and concurrent receive handling; public evidence establishes memory corruption, not code execution.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux lpfc driver allows remote attackers to corrupt kernel memory through a deferred receive race. The deferred receive path frees the RQ buffer before clearing the shared context pointer under lock, letting concurrent ABTS or repost handling release it again. Exploitation requires an active lpfc Fibre Channel target path and concurrent receive handling; public evidence establishes memory corruption, not code execution.

The record

CVE
CVE-2025-39841
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=472e146d1cf3410a898b49834500fa9e33ac41a2 <367cb5ffd8a8a4c85dc89f55e7fa7cc191425b11
  2. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <55658c7501467ca9ef3bd4453dd920010db8bc13
  3. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <897f64b01c1249ac730329b83f4f40bab71e86c7
  4. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <95b63d15fce5c54a73bbf195e1aacb5a75b128e2
  5. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <9dba9a45c348e8460da97c450cddf70b2056deb3
  6. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <ab34084f42ee06a9028d67c78feafb911d33d111
  7. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <baa39f6ad79d372a6ce0aa639fbb2f1578479f57
  8. Affected versionversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <d96cc9a1b57725930c60b607423759d563b4d900
  9. Affected versionversion=5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=472e146d1cf3410a898b49834500fa9e33ac41a2 <367cb5ffd8a8a4c85dc89f55e7fa7cc191425b11; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <55658c7501467ca9ef3bd4453dd920010db8bc13; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <897f64b01c1249ac730329b83f4f40bab71e86c7; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <95b63d15fce5c54a73bbf195e1aacb5a75b128e2; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <9dba9a45c348e8460da97c450cddf70b2056deb3; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <ab34084f42ee06a9028d67c78feafb911d33d111; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <baa39f6ad79d372a6ce0aa639fbb2f1578479f57; version=472e146d1cf3410a898b49834500fa9e33ac41a2 <d96cc9a1b57725930c60b607423759d563b4d900; version=5.1

Published CVSS scores

9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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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