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GHSA-2MXC-QWHF-8GFR

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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

iommu/amd: Fix undefined behavior in devid_write debugfs function

When for_each_pci_segment() loop completes without finding a matching segment, the pci_seg pointer is not NULL but points to an invalid memory location (the list head). Accessing pci_seg->id after the loop causes undefined behavior.

Fix this by handling the successful case inside the loop and returning -EINVAL after the loop if no matching segment is found.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-92505"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix undefined behavior in devid_write debugfs function\n\nWhen for_each_pci_segment() loop completes without finding a matching\nsegment, the pci_seg pointer is not NULL but points to an invalid memory\nlocation (the list head). Accessing pci_seg-\u003eid after the loop causes\nundefined behavior.\n\nFix this by handling the successful case inside the loop and returning\n-EINVAL after the loop if no matching segment is found.",
  "id": "GHSA-2mxc-qwhf-8gfr",
  "modified": "2026-09-17T18:32:07Z",
  "published": "2026-09-17T18:32:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92505"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/843e149989665f8309ad2efe6048dc76591e1f94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8aabe0fba01486b5d893e708b05a8fa7f1b7efbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99d42aef089a07cfb1d404a7227ac9dc7628b497"
    }
  ],
  "schema_version": "1.4.0",
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}

CVE-2026-92505 (GCVE-0-2026-92505)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10

Title

iommu/amd: Fix undefined behavior in devid_write debugfs function

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix undefined behavior in devid_write debugfs function When for_each_pci_segment() loop completes without finding a matching segment, the pci_seg pointer is not NULL but points to an invalid memory location (the list head). Accessing pci_seg->id after the loop causes undefined behavior. Fix this by handling the successful case inside the loop and returning -EINVAL after the loop if no matching segment is found.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/8aabe0fba01486b5d…
https://git.kernel.org/stable/c/99d42aef089a07cfb…
https://git.kernel.org/stable/c/843e149989665f830…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2e98940f123d9c69d4759078aea9a536244c98d3 , < 8aabe0fba01486b5d893e708b05a8fa7f1b7efbb (git) Affected: 2e98940f123d9c69d4759078aea9a536244c98d3 , < 99d42aef089a07cfb1d404a7227ac9dc7628b497 (git) Affected: 2e98940f123d9c69d4759078aea9a536244c98d3 , < 843e149989665f8309ad2efe6048dc76591e1f94 (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/debugfs.c"
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          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
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          "versions": [
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              "version": "6.17"
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              "versionType": "original_commit_for_fix"
            }
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        }
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                  "versionStartIncluding": "6.17",
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                  "versionStartIncluding": "6.17",
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                }
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix undefined behavior in devid_write debugfs function\n\nWhen for_each_pci_segment() loop completes without finding a matching\nsegment, the pci_seg pointer is not NULL but points to an invalid memory\nlocation (the list head). Accessing pci_seg-\u003eid after the loop causes\nundefined behavior.\n\nFix this by handling the successful case inside the loop and returning\n-EINVAL after the loop if no matching segment is found."
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      "providerMetadata": {
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    "datePublished": "2026-09-17T16:10:17.389Z",
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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.
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