CVE-2026-46034

Local kernel crash via uninitialized CDX IRQ array

Published May 27, 2026 · Updated May 27, 2026

NULL pointer dereference in the Linux Kernel VFIO/CDX driver allows local users to crash the host through an out-of-order interrupt ioctl. vfio_cdx_set_msi_trigger() iterates the unallocated cdx_irqs array for DATA_BOOL or DATA_NONE requests when MSI has not first been initialized through EVENTFD. Access to a VFIO CDX device is required, and successful triggering causes an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.14%
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 VFIO/CDX driver allows local users to crash the host through an out-of-order interrupt ioctl. vfio_cdx_set_msi_trigger() iterates the unallocated cdx_irqs array for DATA_BOOL or DATA_NONE requests when MSI has not first been initialized through EVENTFD. Access to a VFIO CDX device is required, and successful triggering causes an availability-only kernel crash.

The record

CVE
CVE-2026-46034
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=6.10
  2. Affected versionversion=848e447e000c41894ff931dc7c004fd42c8840f8 <338a736aaf15e8ba3635ce20b29af5b8fc15e66a
  3. Affected versionversion=848e447e000c41894ff931dc7c004fd42c8840f8 <51bf7638f33aece41cb3f4cbeb942cc52950e329
  4. Affected versionversion=848e447e000c41894ff931dc7c004fd42c8840f8 <5d6c349c9823eb819fed8b537b088cf38126018c
  5. Affected versionversion=848e447e000c41894ff931dc7c004fd42c8840f8 <5ea5880764cbb164afb17a62e76ca75dc371409d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=848e447e000c41894ff931dc7c004fd42c8840f8 <338a736aaf15e8ba3635ce20b29af5b8fc15e66a; version=848e447e000c41894ff931dc7c004fd42c8840f8 <51bf7638f33aece41cb3f4cbeb942cc52950e329; version=848e447e000c41894ff931dc7c004fd42c8840f8 <5d6c349c9823eb819fed8b537b088cf38126018c; version=848e447e000c41894ff931dc7c004fd42c8840f8 <5ea5880764cbb164afb17a62e76ca75dc371409d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/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

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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