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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | samba | 2:4.5.2+dfsg-2 | — |
| Debian 13 | samba | 2:4.5.2+dfsg-2 | — |
| Debian 12 | samba | 2:4.5.2+dfsg-2 | — |
| Debian 8 | samba | 2:4.2.14+dfsg-0+deb8u2 | DSA-3740-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.3 | USN-3158-1 |
| Ubuntu 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.4 | USN-3158-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ctdb +25 | 4.4.4-13.el7_3 | RHSA-2017:1265 |
| RHEL 6 | samba +12 | 3.6.23-41.el6 | RHSA-2017:0662 |
| RHEL 6 | samba4 +12 | 4.2.10-9.el6 | RHSA-2017:0744 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Gluster Storage 3 | ctdb +25 | 4.4.6-4.el6rhs | RHSA-2017:0495, RHSA-2017:0494 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | samba | 4.2.4-28.3.1 | SUSE-SU-2016:3272-1, SUSE-SU-2016:3271-1 |
| SLES 12 SP1 | samba | 4.2.4-28.3.1 | SUSE-SU-2016:3272-1 |
| SLES 12 | samba | 4.2.4-18.30.1 | SUSE-SU-2016:3299-1 |
| SLES 11 SP4 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
| SLES 11 SP3 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP2 | samba +1 | 3.6.3-56.1 | SUSE-SU-2016:3300-1 |
| SLES for SAP 12 SP2 | samba | 4.2.4-28.3.1 | SUSE-SU-2016:3272-1, SUSE-SU-2016:3271-1 |
| SLES for SAP 12 SP1 | samba | 4.2.4-28.3.1 | SUSE-SU-2016:3272-1 |
| SLES for SAP 12 | samba | 4.2.4-18.30.1 | SUSE-SU-2016:3299-1 |
| SLES for SAP 11 SP4 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
| SUSE OpenStack Cloud 5 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
| SUSE Manager Proxy 2.1 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
| SUSE Manager 2.1 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | samba +1 | 3.6.3-84.1 | SUSE-SU-2016:3298-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.14.6+git.182.2205d5224e3-1.1 | openSUSE-SU-2024:11365-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.4 | samba | 4.4.5-r2 | — |
| Alpine v3.3 | samba | 4.2.14-r1 | — |
| Alpine v3.2 | samba | 4.2.14-r1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ctdb +25 | 4.4.4-13.el7_3 | ELSA-2017-1265 |
Advisories 14
- RHSA-2017:1265 Red Hat Security Advisory: samba security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:0744 Red Hat Security Advisory: samba4 security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:0662 Red Hat Security Advisory: samba security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:0495 Red Hat Security Advisory: Red Hat Gluster Storage 3.2.0 samba security, bug fixes and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:0494 Red Hat Security Advisory: Red Hat Gluster Storage 3.2.0 samba security, bug fixes and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3158-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3740-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:3299-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11365-1 ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3272-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3271-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3298-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3300-1 Security update for samba SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2017-1265 Moderate: samba security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 22, 2017
References
- https://www.samba.org/samba/security/CVE-2016-2126.html
- 1037495 vdb-entry
- RHSA-2017:0495 vendor-advisory
- RHSA-2017:0494 vendor-advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730
- RHSA-2017:1265 vendor-advisory
- 94994 vdb-entry
- RHSA-2017:0744 vendor-advisory
- RHSA-2017:0662 vendor-advisory