CVE-2026-93049

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.

References

• 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