{"id":"CVE-2026-68416","state":"PUBLISHED","title":"mtd: fix double free and WARN_ON in add_mtd_device() error paths","description":"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&mtd->part.node)) because the partition node is still linked in the\nparent's partitions list when the release callback fires from the\nadd_mtd_device() error path.\n\nFix this by overriding dev->type and dev->release 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' 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() -> mtd_device_release() -> device_unregister()\nwith dev->type still set to &mtd_devtype, so mtd_release() ->\nrelease_mtd_partition() continues to work correctly for the regular\nremoval case.","publishedAt":"2026-08-10T12:04:36.582Z","updatedAt":"2026-10-30T12:28:33.091Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"93c08951d7070134b7415ca4abd0d25876aa653b","status":"affected","lessThan":"b1f78dc4a6869e30ff64345a5d3e7da1b6da0061","versionType":"git"},{"version":"006764e33fe9cff72f8a68ce1dab570d93662c96","status":"affected","lessThan":"1dfe90daee6080b088b65620ff690a56f59ddea2","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"ffe21a3545b439e7b11578a701c22a847c149561","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"e1e96aca1bdf391e2f49531c270ffc134e5b49a5","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"f98ae09c727dcf34f745c875661c64b642e4abfa","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"820f983d641937a787e841ee4b93501f69f5683e","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"9d4af746af8ce27eefc2338b2feaa1e01f28b6c3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mtd/mtdcore.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mtd/mtdcore.c"]}],"references":["https://git.kernel.org/stable/c/b1f78dc4a6869e30ff64345a5d3e7da1b6da0061","https://git.kernel.org/stable/c/1dfe90daee6080b088b65620ff690a56f59ddea2","https://git.kernel.org/stable/c/ffe21a3545b439e7b11578a701c22a847c149561","https://git.kernel.org/stable/c/e1e96aca1bdf391e2f49531c270ffc134e5b49a5","https://git.kernel.org/stable/c/f98ae09c727dcf34f745c875661c64b642e4abfa","https://git.kernel.org/stable/c/820f983d641937a787e841ee4b93501f69f5683e","https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68416.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68416","state":"PUBLISHED","datePublished":"2026-08-10T12:04:36.582Z","dateUpdated":"2026-10-30T12:28:33.091Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.391Z"},"containers":{"cna":{"title":"mtd: fix double free and WARN_ON in add_mtd_device() error paths","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&mtd->part.node)) because the partition node is still linked in the\nparent's partitions list when the release callback fires from the\nadd_mtd_device() error path.\n\nFix this by overriding dev->type and dev->release 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' 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() -> mtd_device_release() -> device_unregister()\nwith dev->type still set to &mtd_devtype, so mtd_release() ->\nrelease_mtd_partition() continues to work correctly for the regular\nremoval case."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"93c08951d7070134b7415ca4abd0d25876aa653b","status":"affected","lessThan":"b1f78dc4a6869e30ff64345a5d3e7da1b6da0061","versionType":"git"},{"version":"006764e33fe9cff72f8a68ce1dab570d93662c96","status":"affected","lessThan":"1dfe90daee6080b088b65620ff690a56f59ddea2","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"ffe21a3545b439e7b11578a701c22a847c149561","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"e1e96aca1bdf391e2f49531c270ffc134e5b49a5","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"f98ae09c727dcf34f745c875661c64b642e4abfa","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"820f983d641937a787e841ee4b93501f69f5683e","versionType":"git"},{"version":"19bfa9ebebb5ec0695def57eb1d80de7e9cab369","status":"affected","lessThan":"9d4af746af8ce27eefc2338b2feaa1e01f28b6c3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mtd/mtdcore.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mtd/mtdcore.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b1f78dc4a6869e30ff64345a5d3e7da1b6da0061"},{"url":"https://git.kernel.org/stable/c/1dfe90daee6080b088b65620ff690a56f59ddea2"},{"url":"https://git.kernel.org/stable/c/ffe21a3545b439e7b11578a701c22a847c149561"},{"url":"https://git.kernel.org/stable/c/e1e96aca1bdf391e2f49531c270ffc134e5b49a5"},{"url":"https://git.kernel.org/stable/c/f98ae09c727dcf34f745c875661c64b642e4abfa"},{"url":"https://git.kernel.org/stable/c/820f983d641937a787e841ee4b93501f69f5683e"},{"url":"https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:28:33.091Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}