CVE-2026-4747
Kernel RPCSEC_GSS stack overflow enables remote code execution.
Is CVE-2026-4747 being exploited?
Not confirmed. CVE-2026-4747 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 2.5% probability of exploitation in the next 30 days.
How severe is CVE-2026-4747?
CVE-2026-4747 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-2026-4747?
Yes. A fix has been recorded for CVE-2026-4747. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-4747 affect?
CVE-2026-4747 affects FreeBSD kernel kgssapi.ko, RPC servers using librpcgss_sec. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-4747?
Patch when available; limit RPC/NFS exposure; monitor RPC traffic.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via malformed RPCSEC_GSS packets; kernel kgssapi.ko or vulnerable RPC servers can be compromised.
Patch when possible
- affected>= 15.0-RELEASE and < p5
- affected>= 14.4-RELEASE and < p1
- affected>= 14.3-RELEASE and < p10
- affected>= 13.5-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.