Vulnerability-Lookup

GHSA-VM56-MGVF-744C

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:

mtd: mtdswap: Avoid freeing registered blktrans device twice

In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice.

add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev.

The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice.

This issue was found by a static analysis checker and confirmed by manual source review.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93049"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.\n\nadd_mtd_blktrans_dev() initializes the blktrans device reference and\npublishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the\ndisk down and drops the blktrans reference; when that reference reaches\nzero, blktrans_dev_release() frees the mtd_blktrans_dev.\n\nThe debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell\nthrough the common cleanup label and called kfree(mbd_dev) again. Clear\nthe local pointer after deregistration so the common cleanup can still\nrelease the mtdswap state without freeing the blktrans object twice.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review.",
  "id": "GHSA-vm56-mgvf-744c",
  "modified": "2026-09-17T18:32:08Z",
  "published": "2026-09-17T18:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93049"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93049 (GCVE-0-2026-93049)

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

Title

mtd: mtdswap: Avoid freeing registered blktrans device twice

Summary

In the Linux kernel, the following vulnerability has been resolved: mtd: mtdswap: Avoid freeing registered blktrans device twice In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice. add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev. The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice. This issue was found by a static analysis checker and confirmed by manual source review.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ecadb9137aeaa0615…
https://git.kernel.org/stable/c/eec130fc9ffbbd08a…
https://git.kernel.org/stable/c/d5086911d532b82ca…
https://git.kernel.org/stable/c/0ce48c6ddea1a8e67…
https://git.kernel.org/stable/c/a82d93fcfdfd26af1…
https://git.kernel.org/stable/c/5c349c533e72af231…
https://git.kernel.org/stable/c/37be7bc2c2d09c18e…
https://git.kernel.org/stable/c/779aa4c66a96bf43d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < ecadb9137aeaa0615183f8d23eabea2b45c862f1 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < eec130fc9ffbbd08a5d5432683122b79aca2a726 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < d5086911d532b82ca070d944aa08ddde00baefe4 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < a82d93fcfdfd26af17049c34319dfdd079cd1901 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < 5c349c533e72af2313c3be0f80a24d7407fa4777 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < 37be7bc2c2d09c18e939da20224405864a0090b9 (git) Affected: e8e3edb95ce6a146bc774b6cfad3553f4383edc8 , < 779aa4c66a96bf43d2d62982ea1a9096a9128d87 (git)
Linux	Linux	Affected: 4.14 Unaffected: 0 , < 4.14 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (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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{
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          "programFiles": [
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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        }
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        {
          "url": "https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"
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      "title": "mtd: mtdswap: Avoid freeing registered blktrans device twice",
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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