mtd: mtdoops: free page bitmap when the backing MTD is removed
In the Linux kernel, the following vulnerability has been resolved: mtd: mtdoops: free page bitmap when the backing MTD is removed mtdoops_notify_add() allocates oops_page_used when the configured MTD device is registered. mtdoops_notify_remove() detaches from that device but leaves the bitmap allocated. If the same MTD device is later registered again, the add path allocates a new bitmap and overwrites the old pointer, leaking one vmalloc allocation per remove/add cycle. This is only visible when the backing MTD device can disappear and be registered again while mtdoops remains loaded, so the usual static MTD case does not expose it. Free the bitmap after unregistering the dumper and flushing the pending workers, then clear the pointer and page count before a later attach can allocate fresh state. Clearing the pointer also keeps the module exit path from freeing the same bitmap a second time after a remove event.
CVE-2026-89953
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89953
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "477d61d54e097e90f748aa18d013805abd56bcbd",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "a91ac71e67c3e01ed9afd9841435bebb930293f8",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "698944132083d143ef965c0090ee14ba1d9e1a5f",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "f25c804947e0a28c15e73da8e2e0db959cbed716",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "8414f0e9f707226de20b48c7048179fd86d352fc",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "d06f91a52af11630c9f7e487f6daf242ac310cb8",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "1e5cd8bc902331ff801df88cbb299029ae062753",
"versionType": "git"
},
{
"status": "affected",
"version": "be95745f01677245a061a8f51473ef5ec8ad008e",
"lessThan": "956e7da12c114f13c63d126ab1d79c3b6a819060",
"versionType": "git"
}
],
"programFiles": [
"drivers/mtd/mtdoops.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.33"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.33",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/mtd/mtdoops.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89953
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36394 · Revision 1
- Added to Heist Feed
- Publisher date