CVE-2026-93049
Full vulnerability record from the local CVENow database.
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:17:58.223000
Last modified
2026-10-19 10:16:54.677000
View original CVE JSON
{
"id": "CVE-2026-93049",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-17T17:17:58.223",
"lastModified": "2026-10-19T10:16:54.677",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.\n\nadd_mtd_blktrans_dev() initializes the blktrans device reference and\npublishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the\ndisk down and drops the blktrans reference; when that reference reaches\nzero, blktrans_dev_release() frees the mtd_blktrans_dev.\n\nThe debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell\nthrough the common cleanup label and called kfree(mbd_dev) again. Clear\nthe local pointer after deregistration so the common cleanup can still\nrelease the mtdswap state without freeing the blktrans object twice.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review."
}
],
"affected": [
{
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"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/mtd/mtdswap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
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"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
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"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
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"status": "unaffected"
},
{
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{
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},
{
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"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
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}
]
}
]
}
],
"metrics": {},
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