Vulnerability-Lookup

GHSA-P9CF-Q2GF-35MQ

Vulnerability from github – Published: 2026-06-26 21:32 – Updated: 2026-06-28 09:31

Details

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

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption

Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly.

If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption.

If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt.

Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain.

Fix it by returning early if dev_pasid is NULL, before executing the teardown operations.

Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53281"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-26T20:17:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Avoid NULL pointer dereference or refcount corruption\n\nCommit 60f030f7418d (\"iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE\")\nfixed a NULL pointer dereference in an unlikely situation partly.\n\nIf dev_pasid is not found in the dev_pasids list, it remains NULL.\nHowever, the teardown operations are executed unconditionally, this lead\nto a NULL pointer dereference or refcount corruption.\n\nIf the domain was never attached to this IOMMU, info will be NULL, which\nwould cause an immediate dereference when checking --info-\u003erefcnt.\n\nEven if info is not NULL, decrementing the refcount without having removed\na valid PASID might unbalance the count. This could lead to premature\ndropping of the refcount to 0, potentially causing a use-after-free for the\nremaining active devices sharing the domain.\n\nFix it by returning early if dev_pasid is NULL, before executing the\nteardown operations.\n\nIssue found by AI review and suggested by Kevin Tian.\nhttps://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com",
  "id": "GHSA-p9cf-q2gf-35mq",
  "modified": "2026-06-28T09:31:47Z",
  "published": "2026-06-26T21:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53281"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53281 (GCVE-0-2026-53281)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:40 – Updated: 2026-06-28 06:41

Title

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly. If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/9022cb9ac0c2a72a5…
https://git.kernel.org/stable/c/cdfe3c9f2c9e28a86…
https://git.kernel.org/stable/c/79ea2feb917b05366…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 60f030f7418d3f1d94f2fb207fe3080e1844630b , < 9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153 (git) Affected: 60f030f7418d3f1d94f2fb207fe3080e1844630b , < cdfe3c9f2c9e28a8651ee463c88ad191ced2f840 (git) Affected: 60f030f7418d3f1d94f2fb207fe3080e1844630b , < 79ea2feb917b05366b49d85573c9c5331f043b2c (git) Affected: 68ec78beb4a3fb0877cbaaf49758c85410c05977 (git) Affected: df96876be3b064aefc493f760e0639765d13ed0d (git) Affected: 6.12.57 , < 6.13 (semver) Affected: 6.13.3 , < 6.14 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/iommu/intel/iommu.c"
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          "vendor": "Linux",
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            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.57",
              "versionType": "semver"
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              "version": "6.13.3",
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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      ],
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        "engine": "bippy-1.2.0"
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    "datePublished": "2026-06-26T19:40:43.040Z",
    "dateReserved": "2026-06-09T07:44:35.396Z",
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    "state": "PUBLISHED"
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}

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-P9CF-Q2GF-35MQ

CVE-2026-53281 (GCVE-0-2026-53281)

Tags

Sightings

Nomenclature