CVE-2019-5606

Name: CVE-2019-5606
Creator: NVD / NIST
Published: 2019-07-26T01:15:10.923+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2019-5606 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.59%

43.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	11.0
Freebsd	Freebsd	11.2
Freebsd	Freebsd	11.3
Freebsd	Freebsd	12.0

References

http://packetstormsecurity.com/files/153748/FreeBSD-Security-Advisory-FreeBSD-SA-19-13.pts.htmlThird Party Advisory, VDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:13.pts.ascVendor Advisory
https://security.netapp.com/advisory/ntap-20190814-0003/Third Party Advisory
http://packetstormsecurity.com/files/153748/FreeBSD-Security-Advisory-FreeBSD-SA-19-13.pts.htmlThird Party Advisory, VDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:13.pts.ascVendor Advisory
https://security.netapp.com/advisory/ntap-20190814-0003/Third Party Advisory

Timeline

Published: Jul 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5606?

How severe is CVE-2019-5606?

CVE-2019-5606 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5606?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-5606?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST