CVE-2026-49419
FreeBSD jail bug lets local users crash host or possibly escape jail to gain privileges.
Is CVE-2026-49419 being exploited?
Not confirmed. CVE-2026-49419 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-49419?
CVE-2026-49419 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-49419?
Yes. A fix has been recorded for CVE-2026-49419. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49419 affect?
CVE-2026-49419 affects FreeBSD kernel (jail subsystem), FreeBSD hosts and containers using JAIL_AT_DESC. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49419?
Apply vendor patch when released; restrict untrusted users and avoid using jail descriptors.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local unprivileged user can underflow prison refcount, causing host panic or escaping a jail to elevate privileges.
Immediate action required
- affected>= 15.1-RELEASE and < p1
- affected>= 15.0-RELEASE and < p11
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.