{"api_version":"1","generated_at":"2026-09-17T23:31:12+00:00","cve":"CVE-2026-93049","urls":{"html":"https://cve.report/CVE-2026-93049","api":"https://cve.report/api/cve/CVE-2026-93049.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93049","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93049"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:58","updated_at":"2026-09-17 17:17:58"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901","name":"https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9","name":"https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87","name":"https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777","name":"https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726","name":"https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1","name":"https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4","name":"https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","name":"https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93049","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93049","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ecadb9137aeaa0615183f8d23eabea2b45c862f1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 eec130fc9ffbbd08a5d5432683122b79aca2a726 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 d5086911d532b82ca070d944aa08ddde00baefe4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/mtd/mtdswap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ecadb9137aeaa0615183f8d23eabea2b45c862f1","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"eec130fc9ffbbd08a5d5432683122b79aca2a726","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"d5086911d532b82ca070d944aa08ddde00baefe4","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"0ce48c6ddea1a8e675a2eb0221b62a9950788f3c","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"a82d93fcfdfd26af17049c34319dfdd079cd1901","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"5c349c533e72af2313c3be0f80a24d7407fa4777","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"37be7bc2c2d09c18e939da20224405864a0090b9","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"},{"lessThan":"779aa4c66a96bf43d2d62982ea1a9096a9128d87","status":"affected","version":"e8e3edb95ce6a146bc774b6cfad3553f4383edc8","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/mtd/mtdswap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.14"},{"lessThan":"4.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:10:39.679Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1"},{"url":"https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726"},{"url":"https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4"},{"url":"https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c"},{"url":"https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901"},{"url":"https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777"},{"url":"https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9"},{"url":"https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"}],"title":"mtd: mtdswap: Avoid freeing registered blktrans device twice","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93049","datePublished":"2026-09-17T16:10:39.679Z","dateReserved":"2026-09-17T15:57:05.658Z","dateUpdated":"2026-09-17T16:10:39.679Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:58","lastModifiedDate":"2026-09-17 17:17:58","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93049","Ordinal":"1","Title":"mtd: mtdswap: Avoid freeing registered blktrans device twice","CVE":"CVE-2026-93049","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93049","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"mtd: mtdswap: Avoid freeing registered blktrans device twice"}]}}}