CVE-2026-93049 (GCVE-0-2026-93049)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
Version: e8e3edb95ce6a146bc774b6cfad3553f4383edc8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdswap.c"
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      ],
      "cpeApplicability": [
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:44.322Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777"
        },
        {
          "url": "https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"
        }
      ],
      "title": "mtd: mtdswap: Avoid freeing registered blktrans device twice",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93049",
    "datePublished": "2026-09-17T16:10:39.679Z",
    "dateReserved": "2026-09-17T15:57:05.658Z",
    "dateUpdated": "2026-10-19T09:04:44.322Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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