CVE-2019-5606

HIGH

FreeBSD Use-After-Free in posix_openpt Descriptor Close

Title source: llm
STIX 2.1

Description

In FreeBSD 12.0-STABLE before r349805, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r349806, 11.3-RELEASE before 11.3-RELEASE-p1, and 11.2-RELEASE before 11.2-RELEASE-p12, code which handles close of a descriptor created by posix_openpt fails to undo a signal configuration. This causes an incorrect signal to be raised leading to a write after free of kernel memory allowing a malicious user to gain root privileges or escape a jail.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory x_refsource_freebsd
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:13.pts.asc
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20190814-0003/

Scores

CVSS v3 7.8
EPSS 0.0007
EPSS Percentile 21.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (4)
freebsd/freebsd 11.0
freebsd/freebsd 11.2
freebsd/freebsd 11.3
freebsd/freebsd 12.0
Published Jul 26, 2019
Tracked Since Feb 18, 2026