CVE-2026-93049mtd: mtdswap: Avoid freeing registered blktrans device twice
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before ecadb9137aeaa0615183f8d23eabea2b45c862f1; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before eec130fc9ffbbd08a5d5432683122b79aca2a726; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before d5086911d532b82ca070d944aa08ddde00baefe4; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before a82d93fcfdfd26af17049c34319dfdd079cd1901; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 5c349c533e72af2313c3be0f80a24d7407fa4777; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 37be7bc2c2d09c18e939da20224405864a0090b9; from e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 779aa4c66a96bf43d2d62982ea1a9096a9128d87 | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.