CVE-2026-93049

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9
https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777
https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87
https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901
https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4
https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1
https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726

Configurations

No configuration.

History

17 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:17

Updated : 2026-09-17 17:17

NVD link : CVE-2026-93049

Mitre link : CVE-2026-93049

CVE.ORG link : CVE-2026-93049

JSON object : View

Products Affected

No product.

CWE

No CWE.

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