Security advisory
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-16841
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:10 UTC · Revision 1
Source evidence
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
osv:CVE-2018-16841
Complete source record
{
"id": "42ac5512f4be851f977ad22fb0c7c759df779418521e7ddfaec34f66ff505bb2",
"url": "https://osv.dev/vulnerability/CVE-2018-16841",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-16841",
"summary": "Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.",
"evidence": "osv:CVE-2018-16841",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-16841",
"aliases": [
"CVE-2018-16841"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/samba-team/samba",
"type": "GIT",
"events": [
{
"introduced": "b85f6018c803fb9aad82820d4b5505179ec5bac3"
},
{
"fixed": "b7d190f89d7674cf58a02486fa9887d393918611"
},
{
"introduced": "5a9d09fee44052e18ce241ec28f78498d2e20d73"
},
{
"fixed": "cd870beb978a334b948c6992059540c864dd2540"
},
{
"introduced": "4fc4ae2924aaa2fc184b7385069274526fa8a4c2"
},
{
"fixed": "40c057c900a9367e8020c943d29547ea8942212f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.3.0"
},
{
"fixed": "4.7.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.8.0"
},
{
"fixed": "4.8.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.9.0"
},
{
"fixed": "4.9.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"samba-4.8.6",
"samba-4.9.2",
"ldb-1.4.3",
"samba-4.9.1",
"samba-4.9.0",
"samba-4.8.5",
"ldb-1.3.6",
"samba-4.8.3",
"ldb-1.3.4",
"samba-4.8.2",
"ldb-1.3.3",
"samba-4.8.1",
"samba-4.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-16841.json"
}
}
],
"modified": "2026-10-24T10:31:03.732459931Z",
"provider": "osv",
"references": [
"https://security.gentoo.org/glsa/202003-52",
"https://security.netapp.com/advisory/ntap-20181127-0001/",
"https://usn.ubuntu.com/3827-1/",
"https://usn.ubuntu.com/3827-2/",
"https://www.debian.org/security/2018/dsa-4345",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841",
"https://www.samba.org/samba/security/CVE-2018-16841.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "18.10"
},
{
"last_affected": "18.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-16841",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440339,
"published_at": "2018-11-28T14:29:00.347+00:00"
}