CVE-2019-5606: FreeBSD vulnerability

CVE-2019-5606: In FreeBSD 12.0-STABLE before r349805, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r349806, 11....

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 20:01 UTC (UTC+00:00)

Security readout for executives and security teams

A flaw in affected FreeBSD kernels can let a malicious local user gain root privileges or escape a jail. This is not a remote internet bug by itself, but it is serious on shared servers, jail hosts, and systems where untrusted users can run code. Exposure is likely limited to FreeBSD systems before the fixed patch levels, especially multi-user hosts, shell servers, CI workers, and jail-hosting infrastructure. Treat this as high priority where FreeBSD is used for shared hosting, jails, or local-user workloads. Business impact is privilege escalation, tenant isolation failure, and potential full host compromise. Mitigation focus: Upgrade FreeBSD to the fixed patch level or a later supported release.; Prioritize jail hosts and systems with untrusted local users.; Review FreeBSD-SA-19:13 for vendor-specific correction details..

Prepared: Jun 6, 2026, 20:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-5606 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jul 26, 2019, 00:33 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
FreeBSD-SA-19:13CVE reference · vendor-advisory, x_refsource_FREEBSD
https://security.netapp.com/advisory/ntap-20190814-0003/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

FreeBSDFreeBSDFreeBSD before 12.0-RELEASE-p8, before 11.3-RELEASE-p1, and before 11.2-RELEASE-p12Listed

Weakness

CWE details

No CWE listed

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