{"id":"CVE-2026-93049","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < ecadb9137aeaa0615183f8d23eabea2b45c862f1","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < eec130fc9ffbbd08a5d5432683122b79aca2a726","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < d5086911d532b82ca070d944aa08ddde00baefe4","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < a82d93fcfdfd26af17049c34319dfdd079cd1901","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < 5c349c533e72af2313c3be0f80a24d7407fa4777","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < 37be7bc2c2d09c18e939da20224405864a0090b9","Linux >= e8e3edb95ce6a146bc774b6cfad3553f4383edc8 < 779aa4c66a96bf43d2d62982ea1a9096a9128d87","Linux 4.14"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:58.223","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93049","references":[{"url":"https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.771Z","epss":0.0021,"epssPercentile":0.11529,"slug":"CVE-2026-93049","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.\n\nadd_mtd_blktrans_dev() initializes the blktrans device reference and\npublishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the\ndisk down and drops the blktrans reference; when that reference reaches\nzero, blktrans_dev_release() frees the mtd_blktrans_dev.\n\nThe debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell\nthrough the common cleanup label and called kfree(mbd_dev) again. Clear\nthe local pointer after deregistration so the common cleanup can still\nrelease the mtdswap state without freeing the blktrans object twice.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review.\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":[]}