mtd: mtdswap: Avoid freeing registered blktrans device twice

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93049
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:58 UTC
Updated2026-09-17 17:17:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mtd: mtdswap: Avoid freeing registered blktrans device twice In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice. add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev. The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice. This issue was found by a static analysis checker and confirmed by manual source review.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ecadb9137aeaa0615183f8d23eabea2b45c862f1 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 eec130fc9ffbbd08a5d5432683122b79aca2a726 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 d5086911d532b82ca070d944aa08ddde00baefe4 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 a82d93fcfdfd26af17049c34319dfdd079cd1901 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 5c349c533e72af2313c3be0f80a24d7407fa4777 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 37be7bc2c2d09c18e939da20224405864a0090b9 git Not specified
CNA Linux Linux affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 779aa4c66a96bf43d2d62982ea1a9096a9128d87 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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