CVE-2026-93049

mtd: mtdswap: Avoid freeing registered blktrans device twice

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 17, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before ecadb9137aeaa0615183f8d23eabea2b45c862f1Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before eec130fc9ffbbd08a5d5432683122b79aca2a726Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before d5086911d532b82ca070d944aa08ddde00baefe4Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 0ce48c6ddea1a8e675a2eb0221b62a9950788f3cAffected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before a82d93fcfdfd26af17049c34319dfdd079cd1901Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 5c349c533e72af2313c3be0f80a24d7407fa4777Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 37be7bc2c2d09c18e939da20224405864a0090b9Affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 779aa4c66a96bf43d2d62982ea1a9096a9128d87Affected
LinuxLinux	4.14Affected before 4.14Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before ecadb9137aeaa0615183f8d23eabea2b45c862f1Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before eec130fc9ffbbd08a5d5432683122b79aca2a726Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before d5086911d532b82ca070d944aa08ddde00baefe4Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 0ce48c6ddea1a8e675a2eb0221b62a9950788f3cAffected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before a82d93fcfdfd26af17049c34319dfdd079cd1901Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 5c349c533e72af2313c3be0f80a24d7407fa4777Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 37be7bc2c2d09c18e939da20224405864a0090b9Affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8 to before 779aa4c66a96bf43d2d62982ea1a9096a9128d87Affected

LinuxLinux

4.14Affected
before 4.14Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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