CVE-2026-23042

Service interruption via unchecked auxiliary-device teardown

Published Feb 4, 2026 · Updated Feb 4, 2026

NULL pointer dereference in the Linux Kernel idpf driver 6.17 through 6.18.5 allows attackers to trigger a kernel fault during vport teardown. When a vport lacks the RDMA-enable flag, the driver leaves vdev_info unallocated, but idpf_idc_vport_dev_down() dereferences it unconditionally. The fault requires an idpf vport without RDMA support to enter the auxiliary-device unplug path and can interrupt the affected host.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
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 Kernel idpf driver 6.17 through 6.18.5 allows attackers to trigger a kernel fault during vport teardown. When a vport lacks the RDMA-enable flag, the driver leaves vdev_info unallocated, but idpf_idc_vport_dev_down() dereferences it unconditionally. The fault requires an idpf vport without RDMA support to enter the auxiliary-device unplug path and can interrupt the affected host.

The record

CVE
CVE-2026-23042
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=6.17
  2. Affected versionversion=be91128c579c86d295da4325f6ac4710e4e6d2b4 <0ad6d6e50e9d8bf596cfe77a882ddc20b29f525a
  3. Affected versionversion=be91128c579c86d295da4325f6ac4710e4e6d2b4 <4648fb2f2e7210c53b85220ee07d42d1e4bae3f9

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=be91128c579c86d295da4325f6ac4710e4e6d2b4 <0ad6d6e50e9d8bf596cfe77a882ddc20b29f525a; version=be91128c579c86d295da4325f6ac4710e4e6d2b4 <4648fb2f2e7210c53b85220ee07d42d1e4bae3f9

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

T1499.004Application or System Exploitation

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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