FKIE_CVE-2026-68416

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 06:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: fix double free and WARN_ON in add_mtd_device() error paths When device_register() or mtd_nvmem_add() fails inside add_mtd_device() for a partition, the error handling triggers mtd_release() via put_device() or device_unregister(). mtd_release() calls release_mtd_partition() which frees the mtd_info structure. However, callers such as mtd_add_partition() and add_mtd_partitions() also call free_partition() in their error paths, resulting in a double free. Additionally, release_mtd_partition() hits WARN_ON(!list_empty( &mtd->part.node)) because the partition node is still linked in the parent's partitions list when the release callback fires from the add_mtd_device() error path. Fix this by overriding dev->type and dev->release before put_device() in the error paths, so that device_release() invokes a no-op function instead of mtd_release(). For the mtd_nvmem_add() failure case, device_unregister() is replaced with device_del() to separate the device removal from the final kobject reference drop, allowing the override to take effect before put_device() is called. The callers' error paths (list_del + free_partition) remain the sole owners of mtd_info lifetime on add_mtd_device() failure, which is the expected contract. The normal partition teardown path is not affected: del_mtd_device() goes through kref_put() -> mtd_device_release() -> device_unregister() with dev->type still set to &mtd_devtype, so mtd_release() -> release_mtd_partition() continues to work correctly for the regular removal case.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/820f983d641937a787e841ee4b93501f69f5683e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1e96aca1bdf391e2f49531c270ffc134e5b49a5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f98ae09c727dcf34f745c875661c64b642e4abfa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffe21a3545b439e7b11578a701c22a847c149561
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ffe21a3545b439e7b11578a701c22a847c149561",
              "status": "affected",
              "version": "19bfa9ebebb5ec0695def57eb1d80de7e9cab369",
              "versionType": "git"
            },
            {
              "lessThan": "e1e96aca1bdf391e2f49531c270ffc134e5b49a5",
              "status": "affected",
              "version": "19bfa9ebebb5ec0695def57eb1d80de7e9cab369",
              "versionType": "git"
            },
            {
              "lessThan": "f98ae09c727dcf34f745c875661c64b642e4abfa",
              "status": "affected",
              "version": "19bfa9ebebb5ec0695def57eb1d80de7e9cab369",
              "versionType": "git"
            },
            {
              "lessThan": "820f983d641937a787e841ee4b93501f69f5683e",
              "status": "affected",
              "version": "19bfa9ebebb5ec0695def57eb1d80de7e9cab369",
              "versionType": "git"
            },
            {
              "lessThan": "9d4af746af8ce27eefc2338b2feaa1e01f28b6c3",
              "status": "affected",
              "version": "19bfa9ebebb5ec0695def57eb1d80de7e9cab369",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: fix double free and WARN_ON in add_mtd_device() error paths\n\nWhen device_register() or mtd_nvmem_add() fails inside\nadd_mtd_device() for a partition, the error handling triggers\nmtd_release() via put_device() or device_unregister(). mtd_release()\ncalls release_mtd_partition() which frees the mtd_info structure.\nHowever, callers such as mtd_add_partition() and add_mtd_partitions()\nalso call free_partition() in their error paths, resulting in a double\nfree.\n\nAdditionally, release_mtd_partition() hits WARN_ON(!list_empty(\n\u0026mtd-\u003epart.node)) because the partition node is still linked in the\nparent\u0027s partitions list when the release callback fires from the\nadd_mtd_device() error path.\n\nFix this by overriding dev-\u003etype and dev-\u003erelease before put_device()\nin the error paths, so that device_release() invokes a no-op function\ninstead of mtd_release(). For the mtd_nvmem_add() failure case,\ndevice_unregister() is replaced with device_del() to separate the\ndevice removal from the final kobject reference drop, allowing the\noverride to take effect before put_device() is called.\n\nThe callers\u0027 error paths (list_del + free_partition) remain the sole\nowners of mtd_info lifetime on add_mtd_device() failure, which is the\nexpected contract.\n\nThe normal partition teardown path is not affected: del_mtd_device()\ngoes through kref_put() -\u003e mtd_device_release() -\u003e device_unregister()\nwith dev-\u003etype still set to \u0026mtd_devtype, so mtd_release() -\u003e\nrelease_mtd_partition() continues to work correctly for the regular\nremoval case."
    }
  ],
  "id": "CVE-2026-68416",
  "lastModified": "2026-08-17T06:17:50.600",
  "metrics": {},
  "published": "2026-08-10T13:20:35.383",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/820f983d641937a787e841ee4b93501f69f5683e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e1e96aca1bdf391e2f49531c270ffc134e5b49a5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f98ae09c727dcf34f745c875661c64b642e4abfa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ffe21a3545b439e7b11578a701c22a847c149561"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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