UnratedFix available
samba: Fix of CVE-2021-20251
Type: advisorySources: OSV
- CVE-2021-20251: fix race condition in the password lockout code that allowed determined attackers to exceed the configured bad-password count by issuing concurrent authentication / SAMR password-change requests for the same account; the bad-password-count read and the follow-up increment now run under a per-user named mutex in both check_sam_security() and pass_oem_change()
- Products
- ctdb, ctdb-tests, libsmbclient, libsmbclient-devel, libwbclient, libwbclient-devel, samba, samba-client, samba-client-libs, samba-common, samba-common-libs, samba-common-tools, samba-dc, samba-dc-libs, samba-devel, samba-krb5-printing, samba-libs, samba-pidl, samba-python, samba-python-test, samba-test, samba-test-libs, samba-vfs-glusterfs, samba-winbind, samba-winbind-clients, samba-winbind-krb5-locator, samba-winbind-modules
- Affected versions
- Not specified
- Fixed versions
- 4.10.16-25.el7_9.tuxcare.els8
- CVEs
- CVE-2021-20251
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:09 UTC · Revision 1
Source evidence
- CVE-2021-20251: fix race condition in the password lockout code that allowed determined attackers to exceed the configured bad-password count by issuing concurrent authentication / SAMR password-change requests for the same account; the bad-password-count read and the follow-up increment now run under a per-user named mutex in both check_sam_security() and pass_oem_change()
osv:CLSA-2026-1779354406
ctdb
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
ctdb-tests
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
libsmbclient
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
libsmbclient-devel
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
libwbclient
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
libwbclient-devel
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-client
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-client-libs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-common
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-common-libs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-common-tools
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-dc
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-dc-libs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-devel
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-krb5-printing
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-libs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-pidl
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-python
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-python-test
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-test
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-test-libs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-vfs-glusterfs
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-winbind
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-winbind-clients
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-winbind-krb5-locator
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
samba-winbind-modules
Fixed versions: 4.10.16-25.el7_9.tuxcare.els8
Complete source record
{
"id": "0d19ad468c1dab7829e6097192b5b022a4184cc274a1e744d193ff8b3ee0683e",
"url": "https://osv.dev/vulnerability/CLSA-2026-1779354406",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "samba: Fix of CVE-2021-20251",
"summary": "- CVE-2021-20251: fix race condition in the password lockout code that allowed determined attackers to exceed the configured bad-password count by issuing concurrent authentication / SAMR password-change requests for the same account; the bad-password-count read and the follow-up increment now run under a per-user named mutex in both check_sam_security() and pass_oem_change()",
"evidence": "osv:CLSA-2026-1779354406",
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{
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{
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/11/package/name"
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"prerequisites": [],
"fixed_versions": [
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"evidence": "/affected/11/ranges"
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],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/12/package/name"
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{
"name": {
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"evidence": "/affected/13/package/name"
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/14/package/name"
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],
"affected_versions": []
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{
"name": {
"value": "samba-krb5-printing",
"evidence": "/affected/15/package/name"
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"prerequisites": [],
"fixed_versions": [
{
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{
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"evidence": "/affected/16/package/name"
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{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/16/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "samba-pidl",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-python",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/18/ranges"
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],
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{
"name": {
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"evidence": "/affected/19/package/name"
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"evidence": "/affected/20/package/name"
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],
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},
{
"name": {
"value": "samba-test-libs",
"evidence": "/affected/21/package/name"
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{
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"evidence": "/affected/21/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "samba-vfs-glusterfs",
"evidence": "/affected/22/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/22/ranges"
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],
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},
{
"name": {
"value": "samba-winbind",
"evidence": "/affected/23/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/23/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-clients",
"evidence": "/affected/24/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/24/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-krb5-locator",
"evidence": "/affected/25/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.10.16-25.el7_9.tuxcare.els8",
"evidence": "/affected/25/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-modules",
"evidence": "/affected/26/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/26/ranges"
}
],
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],
"severity": "unknown",
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"aliases": [
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"package": {
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"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
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],
"package": {
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"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1779354406.json"
}
},
{
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],
"package": {
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"purl": "pkg:rpm/tuxcare/libwbclient-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
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],
"package": {
"name": "samba",
"purl": "pkg:rpm/tuxcare/samba?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
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],
"package": {
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"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
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],
"package": {
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"purl": "pkg:rpm/tuxcare/samba-client-libs?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
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],
"package": {
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"purl": "pkg:rpm/tuxcare/samba-common?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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},
{
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],
"package": {
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"purl": "pkg:rpm/tuxcare/samba-common-libs?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
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}
},
{
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],
"package": {
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"purl": "pkg:rpm/tuxcare/samba-common-tools?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
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},
{
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]
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],
"package": {
"name": "samba-dc",
"purl": "pkg:rpm/tuxcare/samba-dc?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1779354406.json"
}
},
{
"ranges": [
{
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"events": [
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{
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}
]
}
],
"package": {
"name": "samba-dc-libs",
"purl": "pkg:rpm/tuxcare/samba-dc-libs?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1779354406.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "samba-devel",
"purl": "pkg:rpm/tuxcare/samba-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1779354406.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "4.10.16-25.el7_9.tuxcare.els8"
}
]
}
],
"package": {
"name": "samba-krb5-printing",
"purl": "pkg:rpm/tuxcare/samba-krb5-printing?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1779354406.json"
}
},
{
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}
],
"modified": "2026-10-26T09:31:48.749706331Z",
"provider": "osv",
"upstream": [
"CVE-2021-20251"
],
"references": [
"https://errata.tuxcare.com/els_os/centos7els/CLSA-2026-1779354406.html"
]
},
"related_cves": [
{
"value": "CVE-2021-20251",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448512,
"published_at": "2026-05-21T15:43:36+00:00"
}