CVE-2019-5606: Freebsd

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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 Freebsd: version 11.0 only; version 11.2 only; version 11.3 only; version 12.0 only

Published 2019-07-26. Last modified 2026-06-17.