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.
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.
Metrics
Affected Vendors & Products
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| Vendors | Products |
|---|---|
|
Linux
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|
Linux Kernel
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|
Advisories
| Source | ID | Title |
|---|---|---|
 Debian DLA |
DLA-4817-1 | linux-6.12 security update |
| Debian DLA |
DLA-4841-1 | linux security update |
 Debian DSA |
DSA-6528-1 | linux security update |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Sat, 19 Sep 2026 07:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-415 |
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | mtd: mtdswap: Avoid freeing registered blktrans device twice | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-10-19T09:04:44.322Z
Reserved: 2026-09-17T15:57:05.658Z
Link: CVE-2026-93049
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:17:58.223
Modified: 2026-10-19T10:16:54.677
Link: CVE-2026-93049
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-09-19T17:15:04Z
Weaknesses