CVE-2019-5606

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-07-26 · updated 2026-06-17
Weakness: CWE-416

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.

Affected products

FreeBSD: 11.0, 11.2, 11.3, 12.0

References

http://packetstormsecurity.com/files/153748/FreeBSD-Security-Advisory-FreeBSD-SA-19-13.pts.html
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:13.pts.asc
https://security.netapp.com/advisory/ntap-20190814-0003/
http://packetstormsecurity.com/files/153748/FreeBSD-Security-Advisory-FreeBSD-SA-19-13.pts.html
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:13.pts.asc
https://security.netapp.com/advisory/ntap-20190814-0003/

Get alerted when CVE-2019-5606 or the next vulnerability affects your stack