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mtd: mtdswap: Avoid freeing registered blktrans device twice

Published Sep 17, 2026

Description

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.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (0)

No CWE recorded.

References (8)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner Linux
Published Sep 17, 2026
Updated Sep 17, 2026
Reserved Sep 17, 2026
Link CVE-2026-93049
CISA Vulnrichment
Updated n/a
NVD
Status Received
Modified Sep 17, 2026
Link CVE-2026-93049
Red Hat
Severity n/a
Public date n/a
Links CVE-2026-93049
ENISA EUVD
Assigner n/a
Published n/a
Updated n/a
Exploited since n/a
Link n/a