CVE-2026-93049

Summary

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.

Affected Software

Weaknesses

References

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

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