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CVE-2016-2126

26
FAUCET Score

CVE-2016-2126 describes a privilege elevation vulnerability in Samba versions 4.0.0 through 4.5.2, stemming from incorrect handling of the PAC checksum. An authenticated remote attacker can crash the winbindd process, and a local service with pipe access can then cache elevated permissions. This vulnerability carries a CVSS score of 6.5 (Medium), indicating a network attack vector with low complexity, requiring low privileges, and resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, < 4.3.13CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.4.0, < 4.4.8CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.5.0, < 4.5.3CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.59%
Probability of exploitation in next 30 days
EPSS Percentile
93.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0659 is in the 98th percentile among its peer group of 21,951 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: samba-0:3.6.23-41.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: samba4-0:4.2.10-9.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: samba-0:4.4.4-13.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.2 for RHEL 6Fixed in: samba-0:4.4.6-4.el6rhs
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.2 for RHEL 7Fixed in: samba-0:4.4.6-4.el7rhgs
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: samba
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: samba3x

Vendor Advisories (1)

redhatCVE-2016-2126Moderate

samba: Flaws in Kerberos PAC validation can trigger privilege elevation

Dec 19, 2016

References

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