GHSA-RGHX-9889-FFMW
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-18 18:31In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Flush context cache with correct SID when tearing down aliases
domain_context_clear_one() and device_pasid_table_teardown() are both invoked once per DMA alias of a device. Each function locates the context entry using the bus/devfn pair provided by the pci_for_each_dma_alias() callback, then calls intel_context_flush_no_pasid(), which constructs a device-selective context-cache invalidation from info->bus and info->devfn (that is, always the requester ID of the device itself).
As a result, for every alias other than the device’s own RID, the context entry that was just cleared in memory is never invalidated in the context cache. Hardware may continue using that stale cached entry. In the scalable-mode teardown path, intel_pasid_free_table() can then free the PASID directory still referenced by that stale entry, allowing the IOMMU to walk freed memory.
Fix this by passing the source ID of the entry being torn down to intel_context_flush_no_pasid(), instead of deriving it from @info.
{
"affected": [],
"aliases": [
"CVE-2026-90240"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:19Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Flush context cache with correct SID when tearing down aliases\n\ndomain_context_clear_one() and device_pasid_table_teardown() are both\ninvoked once per DMA alias of a device. Each function locates the context\nentry using the bus/devfn pair provided by the pci_for_each_dma_alias()\ncallback, then calls intel_context_flush_no_pasid(), which constructs a\ndevice-selective context-cache invalidation from info-\u003ebus and\ninfo-\u003edevfn (that is, always the requester ID of the device itself).\n\nAs a result, for every alias other than the device\u2019s own RID, the context\nentry that was just cleared in memory is never invalidated in the context\ncache. Hardware may continue using that stale cached entry. In the\nscalable-mode teardown path, intel_pasid_free_table() can then free the\nPASID directory still referenced by that stale entry, allowing the IOMMU\nto walk freed memory.\n\nFix this by passing the source ID of the entry being torn down to\nintel_context_flush_no_pasid(), instead of deriving it from @info.",
"id": "GHSA-rghx-9889-ffmw",
"modified": "2026-09-18T18:31:28Z",
"published": "2026-09-17T18:31:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90240"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5baddf100b3be730912485648cbaae5e3a251923"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a803141597d61dc0511f7cd849625e17d042ca8a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c54e4ae971b98e8d650400137d332cee56c03f55"
}
],
"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"
}
]
}
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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.