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mtd: mtdswap: Avoid freeing registered blktrans device twice

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-93049

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93049

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "ecadb9137aeaa0615183f8d23eabea2b45c862f1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "eec130fc9ffbbd08a5d5432683122b79aca2a726",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "d5086911d532b82ca070d944aa08ddde00baefe4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "0ce48c6ddea1a8e675a2eb0221b62a9950788f3c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "a82d93fcfdfd26af17049c34319dfdd079cd1901",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "5c349c533e72af2313c3be0f80a24d7407fa4777",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "37be7bc2c2d09c18e939da20224405864a0090b9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8",
        "lessThan": "779aa4c66a96bf43d2d62982ea1a9096a9128d87",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/mtd/mtdswap.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/mtd/mtdswap.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93049

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37785 · Revision 1
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Publisher date
Read the original announcement

Revision history

  1. CVE-2026-93049 · Revision 1Source updated