CVE-2016-2126

medium

Published 2017-05-11 · Modified 2026-05-13

CVSS v3

6.5

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

CVSS v2

4.0

VIR risk

6.5

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.

Predictions

Exploit likelihood

75%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2016-2126

vendor Authored 2026-05-27

Vendor advisory: secalert@redhat.com — https://www.samba.org/samba/security/CVE-2016-2126.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201612-19

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2016-2126.html

OS impact

OS	Version	Status	Fixed in
sles		affected
arch		fixed	`4.5.3-1`
debian	bookworm	fixed	`2:4.5.2+dfsg-2`
debian	bullseye	fixed	`2:4.5.2+dfsg-2`
debian	forky	fixed	`2:4.5.2+dfsg-2`
debian	sid	fixed	`2:4.5.2+dfsg-2`
debian	trixie	fixed	`2:4.5.2+dfsg-2`

Application impact

Vendor	Product	Versions	Fixed
samba	samba	`{"startIncluding":"4.0.0","endExcluding":"4.3.13"}`	`4.3.13`

References

CWEs

CWE-264

Verify integrity in audit chain (admin only). AS-IS.