CVE-2026-53281 (GCVE-0-2026-53281)
Vulnerability from cvelistv5 – Published: 2026-06-26 19:40 – Updated: 2026-06-28 06:41
VLAI
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)
Assigner
References
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) |
{
"containers": {
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"programFiles": [
"drivers/iommu/intel/iommu.c"
],
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"version": "0",
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"status": "unaffected",
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},
{
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}
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{
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],
"descriptions": [
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"value": "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"
}
],
"metrics": [
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"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-28T06:41:22.835Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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},
{
"url": "https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840"
},
{
"url": "https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c"
}
],
"title": "iommu/vt-d: Avoid NULL pointer dereference or refcount corruption",
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"assignerShortName": "Linux",
"cveId": "CVE-2026-53281",
"datePublished": "2026-06-26T19:40:43.040Z",
"dateReserved": "2026-06-09T07:44:35.396Z",
"dateUpdated": "2026-06-28T06:41:22.835Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-53281",
"date": "2026-06-28",
"epss": "0.00124",
"percentile": "0.0247"
},
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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