{"id":"CVE-2026-68416","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:\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 han…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 93c08951d7070134b7415ca4abd0d25876aa653b < b1f78dc4a6869e30ff64345a5d3e7da1b6da0061","Linux >= 006764e33fe9cff72f8a68ce1dab570d93662c96 < 1dfe90daee6080b088b65620ff690a56f59ddea2","Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < ffe21a3545b439e7b11578a701c22a847c149561","Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < e1e96aca1bdf391e2f49531c270ffc134e5b49a5","Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < f98ae09c727dcf34f745c875661c64b642e4abfa","Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < 820f983d641937a787e841ee4b93501f69f5683e","Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < 9d4af746af8ce27eefc2338b2feaa1e01f28b6c3","Linux 6.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:49:06.259041Z"},"published":"2026-08-10","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:55:16.107Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68416","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"}],"tags":["cve.org"],"epss":0.00161,"epssPercentile":0.05293,"ingestedAt":"2026-11-05T15:02:32.465Z","slug":"CVE-2026-68416","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 93c08951d7070134b7415ca4abd0d25876aa653b < b1f78dc4a6869e30ff64345a5d3e7da1b6da0061`\n- `Linux >= 006764e33fe9cff72f8a68ce1dab570d93662c96 < 1dfe90daee6080b088b65620ff690a56f59ddea2`\n- `Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < ffe21a3545b439e7b11578a701c22a847c149561`\n- `Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < e1e96aca1bdf391e2f49531c270ffc134e5b49a5`\n- `Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < f98ae09c727dcf34f745c875661c64b642e4abfa`\n- `Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < 820f983d641937a787e841ee4b93501f69f5683e`\n- `Linux >= 19bfa9ebebb5ec0695def57eb1d80de7e9cab369 < 9d4af746af8ce27eefc2338b2feaa1e01f28b6c3`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}