CVE-2019-5596 — In FreeBSD 11.2-STABLE after r338618 and before r343786, 12.0-STABLE before r343781, and 12.0-RELEASE before 12.0-RELEASE-p3, a bug in the reference count implementation for UNIX domain sockets can cause a file structure to be incorrectly released potentially allowing a malicious local user to gain root privileges or escape from a jail

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HIGH

In FreeBSD 11.2-STABLE after r338618 and before r343786, 12.0-STABLE before r343781, and 12.0-RELEASE before 12.0-RELEASE-p3, a bug in the reference count implementation for UNIX domain sockets can cause a file structure to be incorrectly released potentially allowing a malicious local user to gain root privileges or escape from a jail

Published Feb 12, 2019

8.8

HIGH

CVSS 3.0

EPSS 1.23%

Description

In FreeBSD 11.2-STABLE after r338618 and before r343786, 12.0-STABLE before r343781, and 12.0-RELEASE before 12.0-RELEASE-p3, a bug in the reference count implementation for UNIX domain sockets can cause a file structure to be incorrectly released potentially allowing a malicious local user to gain root privileges or escape from a jail.

Affected products

Vendor FreeBSD Product FreeBSD Default
n/a
- Version
  FreeBSD 12.0 before 12.0-RELEASE-p3
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

FreeBSD

n/a

Version	Status	Constraints
FreeBSD 12.0 before 12.0-RELEASE-p3	affected	-

Remediation

No remediation recorded yet.

Metrics

1.23% 0.01229

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01229

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.23% (0.01229)	67.88th	v5 (v2026.06.15)
Jun 15, 2026	1.23% (0.01229)	64.88th	v5 (v2026.06.15)
Mar 17, 2025	0.46% (0.00465)	62.30th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00045)	18.08th	v3 (v2023.03.01)
May 1, 2024	0.04% (0.00045)	14.70th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00045)	12.67th	v3 (v2023.03.01)
Mar 6, 2023	1.83% (0.01832)	77.15th	v2 (v2022.01.01)
Feb 4, 2022	2.01% (0.02013)	56.42th	v2 (v2022.01.01)
Feb 3, 2022	1.47% (0.01474)	33.21th	v5 (v2026.06.15)
Apr 14, 2021	1.47% (0.01474)	0.00th	v1

Weaknesses (0)

No CWE recorded.

References (2)

http://packetstormsecurity.com/files/155790/FreeBSD-fd-Privilege-Escalation.html
x_refsource_MISC
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:02.fd.asc
vendor-advisoryx_refsource_FREEBSDPatchThird Party Advisory

Link	Providers	Tags
http://packetstormsecurity.com/files/155790/FreeBSD-fd-Privilege-Escalation.html		x_refsource_MISC
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:02.fd.asc		vendor-advisoryx_refsource_FREEBSDPatchThird Party Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner freebsd

Published Feb 12, 2019

Updated Aug 4, 2024

Reserved Jan 7, 2019

Link CVE-2019-5596

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2019-5596

Red Hat

Severity n/a

Public date n/a

Links CVE-2019-5596