CVE-2018-17155 — In FreeBSD before 11.2-STABLE(r338983), 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLE(r338984), and 10.4-RELEASE-p13, due to insufficient initialization of memory copied to userland in the getcontext and swapcontext system calls, small amounts of kernel memory may be disclosed to userland processes

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MEDIUM

In FreeBSD before 11.2-STABLE(r338983), 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLE(r338984), and 10.4-RELEASE-p13, due to insufficient initialization of memory copied to userland in the getcontext and swapcontext system calls, small amounts of kernel memory may be disclosed to userland processes

Published Sep 28, 2018

5.5

MEDIUM

CVSS 3.0

EPSS 0.37%

Description

In FreeBSD before 11.2-STABLE(r338983), 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLE(r338984), and 10.4-RELEASE-p13, due to insufficient initialization of memory copied to userland in the getcontext and swapcontext system calls, small amounts of kernel memory may be disclosed to userland processes. Unprivileged authenticated local users may be able to access small amounts privileged kernel data.

Affected products

Vendor FreeBSD Product FreeBSD Default
n/a
- Version
  10.x before 10.4-RELEASE-p13
  Status
  affected
  Constraints
  -
- Version
  11.1 before 11.1-RELEASE-p15
  Status
  affected
  Constraints
  -
- Version
  11.2 before 11.2-RELEASE-p4
  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
10.x before 10.4-RELEASE-p13	affected	-
11.1 before 11.1-RELEASE-p15	affected	-
11.2 before 11.2-RELEASE-p4	affected	-

Remediation

No remediation recorded yet.

Metrics

0.37% 0.00372

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00372

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (8 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	0.37% (0.00372)	28.75th	v5 (v2026.06.15)
Sep 20, 2026	0.37% (0.00372)	31.09th	v5 (v2026.06.15)
Jul 20, 2024	0.04% (0.00042)	5.06th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00042)	5.63th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.22% (0.00221)	1.67th	v5 (v2026.06.15)
Apr 14, 2021	0.22% (0.00221)	0.00th	v1