HighFix available
samba — security advisory
In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.
- Products
- samba
- Affected versions
- Not specified
- Fixed versions
- 4.13.17-r0, 4.14.12-r0, 4.15.2-r0
- CVEs
- CVE-2021-3738
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:05 UTC · Revision 1
Source evidence
In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.
osv:ALPINE-CVE-2021-3738
samba
Fixed versions: 4.13.17-r0
samba
Fixed versions: 4.14.12-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
samba
Fixed versions: 4.15.2-r0
Complete source record
{
"id": "6979101246e9c8b651be31f4f2dc26b2a6e0d65ab4458a5a9884796c6619205f",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-3738",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-3738",
"summary": "In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.",
"evidence": "osv:ALPINE-CVE-2021-3738",
"products": [
{
"name": {
"value": "samba",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.13.17-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.14.12-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.15.2-r0",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2021-3738",
"aliases": [
"ALPINE-CVE-2021-3738"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.13.17-r0"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.14.12-r0"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.15.2-r0"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.15.2-r0"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
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"events": [
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{
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}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"events": [
{
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{
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}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"events": [
{
"introduced": "4.0.0"
},
{
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}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
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{
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]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"introduced": "4.0.0"
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}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
},
{
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"events": [
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},
{
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}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
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{
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},
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}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
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},
{
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{
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}
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],
"package": {
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"purl": "pkg:apk/alpine/samba?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3738.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-23T17:17:56.203348434Z",
"provider": "osv",
"upstream": [
"CVE-2021-3738"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-3738"
]
},
"related_cves": [
{
"value": "CVE-2021-3738",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415510,
"published_at": "2022-03-02T23:15:09.07+00:00"
}