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GHSA-M5CM-762C-JPJJ

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:

dax/fsdev: clear vmemmap_shift when binding static pgmap

Clear pgmap->vmemmap_shift for static DAX devices. When rebinding a static device from device_dax (which may set vmemmap_shift based on alignment) to fsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly zero it before devm_memremap_pages() so the vmemmap is built for order-0 folios as fsdev requires.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93076"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear vmemmap_shift when binding static pgmap\n\nClear pgmap-\u003evmemmap_shift for static DAX devices. When rebinding a static\ndevice from device_dax (which may set vmemmap_shift based on alignment) to\nfsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly\nzero it before devm_memremap_pages() so the vmemmap is built for order-0\nfolios as fsdev requires.",
  "id": "GHSA-m5cm-762c-jpjj",
  "modified": "2026-09-17T18:32:09Z",
  "published": "2026-09-17T18:32:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93076"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d298a0513aaf7d48f2a9f4a90041de910750cfcf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0239229931faf9ca3367e3befcf16f77b2cd45b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93076 (GCVE-0-2026-93076)

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

Title

dax/fsdev: clear vmemmap_shift when binding static pgmap

Summary

In the Linux kernel, the following vulnerability has been resolved: dax/fsdev: clear vmemmap_shift when binding static pgmap Clear pgmap->vmemmap_shift for static DAX devices. When rebinding a static device from device_dax (which may set vmemmap_shift based on alignment) to fsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly zero it before devm_memremap_pages() so the vmemmap is built for order-0 folios as fsdev requires.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/d298a0513aaf7d48f…
https://git.kernel.org/stable/c/e0239229931faf9ca…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d5406bd458b0ac10b1301a4d5801d85c8f648637 , < d298a0513aaf7d48f2a9f4a90041de910750cfcf (git) Affected: d5406bd458b0ac10b1301a4d5801d85c8f648637 , < e0239229931faf9ca3367e3befcf16f77b2cd45b (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/dax/fsdev.c"
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d298a0513aaf7d48f2a9f4a90041de910750cfcf",
              "status": "affected",
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            },
            {
              "lessThan": "e0239229931faf9ca3367e3befcf16f77b2cd45b",
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              "version": "0",
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            },
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
            }
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        }
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                  "versionStartIncluding": "7.1",
                  "vulnerable": true
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear vmemmap_shift when binding static pgmap\n\nClear pgmap-\u003evmemmap_shift for static DAX devices. When rebinding a static\ndevice from device_dax (which may set vmemmap_shift based on alignment) to\nfsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly\nzero it before devm_memremap_pages() so the vmemmap is built for order-0\nfolios as fsdev requires."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:10:58.370Z",
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          "url": "https://git.kernel.org/stable/c/e0239229931faf9ca3367e3befcf16f77b2cd45b"
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    "cveId": "CVE-2026-93076",
    "datePublished": "2026-09-17T16:10:58.370Z",
    "dateReserved": "2026-09-17T15:57:05.661Z",
    "dateUpdated": "2026-09-17T16:10:58.370Z",
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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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