{"cve":"CVE-2026-68416","nvd":{"published":"2026-08-10T13:20:35.383","modified":"2026-10-30T13:19:45.010","status":"Received","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1dfe90daee6080b088b65620ff690a56f59ddea2","https://git.kernel.org/stable/c/820f983d641937a787e841ee4b93501f69f5683e","https://git.kernel.org/stable/c/9d4af746af8ce27eefc2338b2feaa1e01f28b6c3","https://git.kernel.org/stable/c/b1f78dc4a6869e30ff64345a5d3e7da1b6da0061","https://git.kernel.org/stable/c/e1e96aca1bdf391e2f49531c270ffc134e5b49a5"],"products":[],"source":"nvd","synced_at":"2026-10-30T13:47:47.119061695+00:00"},"epss":{"cve":"CVE-2026-68416","score":0.00156,"percentile":0.04757,"date":"2026-10-30"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}