CVE-2026-93049
Description
In 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.
How to fix
- Linux Linuxecadb9137aeaa0615183f8d23eabea2b45c862f1, eec130fc9ffbbd08a5d5432683122b79aca2a726, d5086911d532b82ca070d944aa08ddde00baefe4, 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c, a82d93fcfdfd26af17049c34319dfdd079cd1901, 5c349c533e72af2313c3be0f80a24d7407fa4777, 37be7bc2c2d09c18e939da20224405864a0090b9, 779aa4c66a96bf43d2d62982ea1a9096a9128d87 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < ecadb9137aeaa0615183f8d23eabea2b45c862f1, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < eec130fc9ffbbd08a5d5432683122b79aca2a726, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < d5086911d532b82ca070d944aa08ddde00baefe4, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < a82d93fcfdfd26af17049c34319dfdd079cd1901, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < 5c349c533e72af2313c3be0f80a24d7407fa4777, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < 37be7bc2c2d09c18e939da20224405864a0090b9, e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ≤ v < 779aa4c66a96bf43d2d62982ea1a9096a9128d87, 4.14 | ecadb9137aeaa0615183f8d23eabea2b45c862f1, eec130fc9ffbbd08a5d5432683122b79aca2a726, d5086911d532b82ca070d944aa08ddde00baefe4, 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c, a82d93fcfdfd26af17049c34319dfdd079cd1901, 5c349c533e72af2313c3be0f80a24d7407fa4777, 37be7bc2c2d09c18e939da20224405864a0090b9, 779aa4c66a96bf43d2d62982ea1a9096a9128d87 |
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