linux — security advisory
In the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch.
- Products
- linux
- Affected versions
- Not specified
- Fixed versions
- 6.1.20-1
- CVEs
- CVE-2023-53171
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 15:20 UTC · Revision 1
Source evidence
In the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch.
osv:DEBIAN-CVE-2023-53171
linux
Fixed versions: 6.1.20-1
linux
Fixed versions: 6.1.20-1
linux
Fixed versions: 6.1.20-1
Complete source record
{
"id": "1ddd65fefeb04aa4b5b4f94e9f9eb8ee05fc768f1892ead648f6a789241ac411",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-53171",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2023-53171",
"summary": "In the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch.",
"evidence": "osv:DEBIAN-CVE-2023-53171",
"products": [
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"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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"evidence": "/affected/0/ranges"
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{
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"severity": "medium",
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"aliases": [
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"metrics": [
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"affected": [
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"ecosystem": "Debian:12"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53171.json"
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{
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"package": {
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"ecosystem": "Debian:13"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53171.json"
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{
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"package": {
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"ecosystem": "Debian:14"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53171.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T18:00:14.397095931Z",
"provider": "osv",
"upstream": [
"CVE-2023-53171"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2023-53171"
]
},
"related_cves": [
{
"value": "CVE-2023-53171",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 454935,
"published_at": "2025-09-15T14:15:38.94+00:00"
}