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TI-2016-01949 Aliases CVE-2016-2126GHSA-j88p-975v-5qqh

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect…

Priority LOW 38CWE-264Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 19 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.

Summary

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.

Why it matters now

EPSS 0.06585 93rd percentileScored 2026-11-07
Fix Partial Red Hat: 5 advisoriesRed Hat: 19 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*4.0.0 to before 4.3.13; 4.4.0 to before 4.4.8; 4.5.0 to before 4.5.3VulnerableSamba
  • cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.0.0 to before 4.3.13; 4.4.0 to before 4.4.8; 4.5.0 to before 4.5.3 Vulnerable ·Samba

Remediation

Red Hat 5 advisories

  • RHSA-2017:1265 Released 2017-05-22 · Red Hat rating Moderate
    samba security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) libsmbclient-4.4.4-13.el7_3, libwbclient-4.4.4-13.el7_3, samba-4.4.4-13.el7_3 +10
    • Red Hat Enterprise Linux Client Optional (v. 7) libsmbclient-devel-4.4.4-13.el7_3, libwbclient-devel-4.4.4-13.el7_3, samba-4.4.4-13.el7_3 +9
    • Red Hat Enterprise Linux ComputeNode (v. 7) libsmbclient-4.4.4-13.el7_3, libwbclient-4.4.4-13.el7_3, samba-4.4.4-13.el7_3 +9
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) libsmbclient-devel-4.4.4-13.el7_3, libwbclient-devel-4.4.4-13.el7_3, samba-4.4.4-13.el7_3 +10
    • Red Hat Enterprise Linux Server (v. 7) libsmbclient-4.4.4-13.el7_3, libsmbclient-4.4.4-13.el7_3.ppc, libwbclient-4.4.4-13.el7_3 +16
    • Red Hat Enterprise Linux Server Optional (v. 7) libsmbclient-devel-4.4.4-13.el7_3, libsmbclient-devel-4.4.4-13.el7_3.ppc, libwbclient-devel-4.4.4-13.el7_3 +12
    • Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb-4.4.4-13.el7_3, ctdb-tests-4.4.4-13.el7_3
    • Red Hat Enterprise Linux Workstation (v. 7) libsmbclient-4.4.4-13.el7_3, libwbclient-4.4.4-13.el7_3, samba-4.4.4-13.el7_3 +11
    • Red Hat Enterprise Linux Workstation Optional (v. 7) libsmbclient-devel-4.4.4-13.el7_3, libwbclient-devel-4.4.4-13.el7_3, samba-dc-4.4.4-13.el7_3 +7
  • RHSA-2017:0495 Released 2017-03-23 · Red Hat rating Moderate
    Red Hat Gluster Storage 3.2.0 samba security, bug fixes and enhancement update
    • Red Hat Gluster 3.2 Samba on RHEL-7 ctdb-4.4.6-4.el7rhgs, ctdb-tests-4.4.6-4.el7rhgs, libsmbclient-4.4.6-4.el7rhgs +23
  • RHSA-2017:0494 Released 2017-03-23 · Red Hat rating Moderate
    Red Hat Gluster Storage 3.2.0 samba security, bug fixes and enhancement update
    • Red Hat Gluster 3.2 Samba on RHEL-6 ctdb-4.4.6-4.el6rhs, ctdb-tests-4.4.6-4.el6rhs, libsmbclient-4.4.6-4.el6rhs +23
Show 2 more Red Hat advisories
  • RHSA-2017:0744 Released 2017-03-21 · Red Hat rating Moderate
    samba4 security and bug fix update
    • Red Hat Enterprise Linux Desktop (v. 6) samba4-4.2.10-9.el6, samba4-client-4.2.10-9.el6, samba4-common-4.2.10-9.el6 +10
    • Red Hat Enterprise Linux HPC Node (v. 6) samba4-4.2.10-9.el6, samba4-client-4.2.10-9.el6, samba4-common-4.2.10-9.el6 +10
    • Red Hat Enterprise Linux Server (v. 6) samba4-4.2.10-9.el6, samba4-client-4.2.10-9.el6, samba4-common-4.2.10-9.el6 +10
    • Red Hat Enterprise Linux Workstation (v. 6) samba4-4.2.10-9.el6, samba4-client-4.2.10-9.el6, samba4-common-4.2.10-9.el6 +10
  • RHSA-2017:0662 Released 2017-03-21 · Red Hat rating Moderate
    samba security and bug fix update
    • Red Hat Enterprise Linux Desktop (v. 6) libsmbclient-3.6.23-41.el6, samba-3.6.23-41.el6, samba-client-3.6.23-41.el6 +3
    • Red Hat Enterprise Linux Desktop Optional (v. 6) libsmbclient-devel-3.6.23-41.el6, samba-3.6.23-41.el6, samba-doc-3.6.23-41.el6 +5
    • Red Hat Enterprise Linux HPC Node (v. 6) samba-3.6.23-41.el6, samba-client-3.6.23-41.el6, samba-common-3.6.23-41.el6 +2
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) libsmbclient-3.6.23-41.el6, libsmbclient-devel-3.6.23-41.el6, samba-3.6.23-41.el6 +6
    • Red Hat Enterprise Linux Server (v. 6) libsmbclient-3.6.23-41.el6, libsmbclient-3.6.23-41.el6.ppc, samba-3.6.23-41.el6 +6
    • Red Hat Enterprise Linux Server Optional (v. 6) libsmbclient-devel-3.6.23-41.el6, libsmbclient-devel-3.6.23-41.el6.ppc, samba-doc-3.6.23-41.el6 +6
    • Red Hat Enterprise Linux Workstation (v. 6) libsmbclient-3.6.23-41.el6, samba-3.6.23-41.el6, samba-client-3.6.23-41.el6 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 6) libsmbclient-devel-3.6.23-41.el6, samba-doc-3.6.23-41.el6, samba-domainjoin-gui-3.6.23-41.el6 +4

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2017:0662, RHSA-2017:0744
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2017:0662
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2017:0662, RHSA-2017:0744
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2017:0662
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2017:0662, RHSA-2017:0744
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2017:0662
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Server Resilient Storage (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2017:0662, RHSA-2017:0744
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2017:1265
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2017:0662
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2017:1265
Red Hat Gluster 3.2 Samba on RHEL-6Fixed RHSA-2017:0494
Red Hat Gluster 3.2 Samba on RHEL-7Fixed RHSA-2017:0495

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-2126
  2. 2026-10-03 Alias added: GHSA-j88p-975v-5qqh

References

Advisory 7

  • TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-05139 Code injection in samba KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-00210 The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x… CVSS 2.0HIGH 10.0
  • TI-2003-00081 Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in… CVSS 2.0HIGH 10.0
  • TI-2003-00185 Buffer overflow in the call_trans2open function in trans2.c for Samba 2.2.x before… CVSS 2.0HIGH 10.0
  • TI-2007-02362 Multiple heap-based buffer overflows in the NDR parsing in smbd in Samba 3.0.0 through… CVSS 2.0HIGH 10.0
See all 215 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences