CVE-2026-93049

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References