samba: Flaws in Kerberos PAC validation can trigger privilege elevation
Published May 11, 2017
6.5
MEDIUMCVSS 3.1
EPSS 6.59%
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 6
samba-0:3.6.23-41.el6
Fixed · RHSA-2017:0662
Red Hat Enterprise Linux 6
samba4-0:4.2.10-9.el6
Fixed · RHSA-2017:0744
Red Hat Enterprise Linux 7
samba-0:4.4.4-13.el7_3
Fixed · RHSA-2017:1265
Red Hat Gluster Storage 3.2 for RHEL 6
samba-0:4.4.6-4.el6rhs
Fixed · RHSA-2017:0494
Red Hat Gluster Storage 3.2 for RHEL 7
samba-0:4.4.6-4.el7rhgs
Fixed · RHSA-2017:0495
Red Hat Enterprise Linux 5
samba
Will not fix
Red Hat Enterprise Linux 5
samba3x
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | samba-0:3.6.23-41.el6 | Fixed | RHSA-2017:0662 |
| Red Hat Enterprise Linux 6 | samba4-0:4.2.10-9.el6 | Fixed | RHSA-2017:0744 |
| Red Hat Enterprise Linux 7 | samba-0:4.4.4-13.el7_3 | Fixed | RHSA-2017:1265 |
| Red Hat Gluster Storage 3.2 for RHEL 6 | samba-0:4.4.6-4.el6rhs | Fixed | RHSA-2017:0494 |
| Red Hat Gluster Storage 3.2 for RHEL 7 | samba-0:4.4.6-4.el7rhgs | Fixed | RHSA-2017:0495 |
| Red Hat Enterprise Linux 5 | samba | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | samba3x | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 6.59% (0.06585) | 93.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.59% (0.06585) | 92.95th | v5 (v2026.06.15) |
| Nov 30, 2025 | 4.21% (0.04207) | 88.32th | v4 (v2025.03.14) |
| Oct 19, 2025 | 6.01% (0.06011) | 90.25th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.13% (0.04135) | 80.74th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.65% (0.02654) | 84.77th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.44% (0.00444) | 75.75th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.44% (0.00444) | 74.18th | v3 (v2023.03.01) |
| Jul 7, 2023 | 0.44% (0.00444) | 71.42th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.40% (0.00395) | 69.26th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.65% (0.01649) | 75.99th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.65% (0.01649) | 75.95th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.65% (0.01649) | 73.90th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.65% (0.01649) | 52.77th | v2 (v2022.01.01) |
References (13)
- http://rhn.redhat.com/errata/RHSA-2017-0494.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0495.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0662.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0744.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.securityfocus.com/bid/94994 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037495 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1265 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-2126 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1403115 Issue Tracking
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730 x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-2126
- https://www.cve.org/CVERecord?id=CVE-2016-2126
- https://www.samba.org/samba/security/CVE-2016-2126.html x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.