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Vulnerability record · CVE-2016-2126 · published 11 May 2017

CVE-2016-2126: Samba permissions and access controls vulnerability

Samba · Samba

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

6.5 CVSS 3.1 Medium EPSS 6.6% · top 6.4% CWE-264 · Permissions and access controls
6.5CVSS 3.1 base score, v2 4.0
6.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2017-0494.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0495.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0662.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0744.html Third Party Advisory
http://www.securityfocus.com/bid/94994 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037495 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1265 Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730 Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2126.html Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2017-0494.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0495.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0662.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0744.html Third Party Advisory
http://www.securityfocus.com/bid/94994 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037495 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1265 Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730 Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2126.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-2126), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.