CVE-2025-40342

Kernel memory corruption via unlocked port-state race

Published Dec 9, 2025 · Updated Aug 5, 2026

Race condition in Linux nvme-fc 4.10 and later allows attackers to corrupt kernel memory through Fibre Channel port events. nvme_fc_create_association checks port_state and increments the remote-port active count without the lock needed to make those operations atomic with nvme_fc_unregister_remote. An unauthenticated peer on the same Fibre Channel fabric can repeatedly overlap teardown and reconnect processing, causing stale remote-port use, kernel memory access, or a host panic.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux nvme-fc 4.10 and later allows attackers to corrupt kernel memory through Fibre Channel port events. nvme_fc_create_association checks port_state and increments the remote-port active count without the lock needed to make those operations atomic with nvme_fc_unregister_remote. An unauthenticated peer on the same Fibre Channel fabric can repeatedly overlap teardown and reconnect processing, causing stale remote-port use, kernel memory access, or a host panic.

The record

CVE
CVE-2025-40342
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.10
  2. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <25f4bf1f7979a7871974fd36c79d69ff1cf4b446
  3. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <4253e0a4546138a2bf9cb6acf66b32fee677fc7c
  4. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <891cdbb162ccdb079cd5228ae43bdeebce8597ad
  5. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <9950af4303942081dc8c7a5fdc3688c17c7eb6c0
  6. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <a2f7fa75c4a2a07328fa22ccbef461db76790b55
  7. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <de3d91af47bc015031e7721b100a29989f6498a5
  8. Affected versionversion=e399441de9115cd472b8ace6c517708273ca7997 <e8cde03de8674b05f2c5e0870729049eba517800

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=e399441de9115cd472b8ace6c517708273ca7997 <25f4bf1f7979a7871974fd36c79d69ff1cf4b446; version=e399441de9115cd472b8ace6c517708273ca7997 <4253e0a4546138a2bf9cb6acf66b32fee677fc7c; version=e399441de9115cd472b8ace6c517708273ca7997 <891cdbb162ccdb079cd5228ae43bdeebce8597ad; version=e399441de9115cd472b8ace6c517708273ca7997 <9950af4303942081dc8c7a5fdc3688c17c7eb6c0; version=e399441de9115cd472b8ace6c517708273ca7997 <a2f7fa75c4a2a07328fa22ccbef461db76790b55; version=e399441de9115cd472b8ace6c517708273ca7997 <de3d91af47bc015031e7721b100a29989f6498a5; version=e399441de9115cd472b8ace6c517708273ca7997 <e8cde03de8674b05f2c5e0870729049eba517800

Published CVSS scores

6.4SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.7Oracle LinuxCVSS:3.1/AV:L/AC:H/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

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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