CVE-2026-68416 (GCVE-0-2026-68416)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:05
VLAI
Title
mtd: fix double free and WARN_ON in add_mtd_device() error paths
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 , < ffe21a3545b439e7b11578a701c22a847c149561 (git)
Affected: 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 , < e1e96aca1bdf391e2f49531c270ffc134e5b49a5 (git)
Affected: 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 , < f98ae09c727dcf34f745c875661c64b642e4abfa (git)
Affected: 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 , < 820f983d641937a787e841ee4b93501f69f5683e (git)
Affected: 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 , < 9d4af746af8ce27eefc2338b2feaa1e01f28b6c3 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
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        "dateUpdated": "2026-08-17T05:05:10.971Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3"
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    "datePublished": "2026-08-10T12:04:36.582Z",
    "dateReserved": "2026-07-30T09:28:09.391Z",
    "dateUpdated": "2026-08-17T05:05:10.971Z",
    "state": "PUBLISHED"
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            "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",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T15:32:27+00:00",
      "cve": "CVE-2026-68416",
      "id": "CVE-2026-68416",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mtd: fix double free and WARN_ON in add_mtd_device() error paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68416.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-22T16:41:21Z",
      "cve": "CVE-2026-68416",
      "id": "CVE-2026-68416",
      "initial_release_date": "2026-08-11T23:46:02Z",
      "product_status:first_fixed": "60",
      "product_status:known_affected": "12",
      "product_status:known_not_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68416",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68416.json",
      "version": "5"
    }
  }
}



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