Vulnerability-Lookup

GHSA-CJ6G-RRGH-RX3W

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

vfio/cdx: Fix NULL pointer dereference in interrupt trigger path

Add validation to ensure MSI is configured before accessing cdx_irqs array in vfio_cdx_set_msi_trigger(). Without this check, userspace can trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before ever setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD.

The vfio_cdx_msi_enable() function allocates the cdx_irqs array and sets config_msi to 1 only when called through the EVENTFD path. The trigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been done, but there was no enforcement of this call ordering.

This matches the protection used in the PCI VFIO driver where vfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46034"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:22Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/cdx: Fix NULL pointer dereference in interrupt trigger path\n\nAdd validation to ensure MSI is configured before accessing cdx_irqs\narray in vfio_cdx_set_msi_trigger(). Without this check, userspace\ncan trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS\nwith VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before\never setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD.\n\nThe vfio_cdx_msi_enable() function allocates the cdx_irqs array and\nsets config_msi to 1 only when called through the EVENTFD path. The\ntrigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been\ndone, but there was no enforcement of this call ordering.\n\nThis matches the protection used in the PCI VFIO driver where\nvfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.",
  "id": "GHSA-cj6g-rrgh-rx3w",
  "modified": "2026-05-27T15:33:21Z",
  "published": "2026-05-27T15:33:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46034"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46034 (GCVE-0-2026-46034)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-05-27 12:56

Title

vfio/cdx: Fix NULL pointer dereference in interrupt trigger path

Summary

In the Linux kernel, the following vulnerability has been resolved: vfio/cdx: Fix NULL pointer dereference in interrupt trigger path Add validation to ensure MSI is configured before accessing cdx_irqs array in vfio_cdx_set_msi_trigger(). Without this check, userspace can trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before ever setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD. The vfio_cdx_msi_enable() function allocates the cdx_irqs array and sets config_msi to 1 only when called through the EVENTFD path. The trigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been done, but there was no enforcement of this call ordering. This matches the protection used in the PCI VFIO driver where vfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/51bf7638f33aece41…
https://git.kernel.org/stable/c/5d6c349c9823eb819…
https://git.kernel.org/stable/c/338a736aaf15e8ba3…
https://git.kernel.org/stable/c/5ea5880764cbb164a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 51bf7638f33aece41cb3f4cbeb942cc52950e329 (git) Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 5d6c349c9823eb819fed8b537b088cf38126018c (git) Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 338a736aaf15e8ba3635ce20b29af5b8fc15e66a (git) Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 5ea5880764cbb164afb17a62e76ca75dc371409d (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/cdx/intr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "51bf7638f33aece41cb3f4cbeb942cc52950e329",
              "status": "affected",
              "version": "848e447e000c41894ff931dc7c004fd42c8840f8",
              "versionType": "git"
            },
            {
              "lessThan": "5d6c349c9823eb819fed8b537b088cf38126018c",
              "status": "affected",
              "version": "848e447e000c41894ff931dc7c004fd42c8840f8",
              "versionType": "git"
            },
            {
              "lessThan": "338a736aaf15e8ba3635ce20b29af5b8fc15e66a",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "5ea5880764cbb164afb17a62e76ca75dc371409d",
              "status": "affected",
              "version": "848e447e000c41894ff931dc7c004fd42c8840f8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.86",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/cdx: Fix NULL pointer dereference in interrupt trigger path\n\nAdd validation to ensure MSI is configured before accessing cdx_irqs\narray in vfio_cdx_set_msi_trigger(). Without this check, userspace\ncan trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS\nwith VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before\never setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD.\n\nThe vfio_cdx_msi_enable() function allocates the cdx_irqs array and\nsets config_msi to 1 only when called through the EVENTFD path. The\ntrigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been\ndone, but there was no enforcement of this call ordering.\n\nThis matches the protection used in the PCI VFIO driver where\nvfio_pci_set_msi_trigger() checks irq_is() before the trigger loop."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:56:43.389Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d"
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      ],
      "title": "vfio/cdx: Fix NULL pointer dereference in interrupt trigger path",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46034",
    "datePublished": "2026-05-27T12:56:43.389Z",
    "dateReserved": "2026-05-13T15:03:33.093Z",
    "dateUpdated": "2026-05-27T12:56:43.389Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-CJ6G-RRGH-RX3W

CVE-2026-46034 (GCVE-0-2026-46034)

Tags

Sightings

Nomenclature