{"id":"CVE-2026-93049","revision":null,"records":[{"revision":"0d097f5774ba479fb5485a3fd57a2aab","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93049","aliases":[],"title":"mtd: mtdswap: Avoid freeing registered blktrans device twice","description":"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.\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.","state":0,"publishedAt":"2026-09-17T16:10:39.679+00:00","modifiedAt":"2026-10-19T09:04:44.322+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/mtd/mtdswap.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"ecadb9137aeaa0615183f8d23eabea2b45c862f1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"eec130fc9ffbbd08a5d5432683122b79aca2a726\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"d5086911d532b82ca070d944aa08ddde00baefe4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"0ce48c6ddea1a8e675a2eb0221b62a9950788f3c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"a82d93fcfdfd26af17049c34319dfdd079cd1901\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"5c349c533e72af2313c3be0f80a24d7407fa4777\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"37be7bc2c2d09c18e939da20224405864a0090b9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e8e3edb95ce6a146bc774b6cfad3553f4383edc8\",\n \"lessThan\": \"779aa4c66a96bf43d2d62982ea1a9096a9128d87\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/mtd/mtdswap.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1","https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726","https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4","https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901","https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777","https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9","https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93049","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93049","identifiers":["CVE-2026-93049"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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