Critical remote RCE in widely used enterprise OS/virtualization (IBM AIX/PowerVM) that can disrupt server infrastructure across organizations.
CVE-2026-16872
Remote stack buffer overflow in IBM AIX/PowerVM VIOS enabling arbitrary code execution.
Is CVE-2026-16872 being exploited?
Not confirmed. CVE-2026-16872 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-16872?
CVE-2026-16872 is rated Critical with a CVSS score of 9.8. 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-2026-16872?
Yes. A fix has been recorded for CVE-2026-16872. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16872 affect?
CVE-2026-16872 affects IBM AIX 7.2, IBM AIX 7.3, IBM PowerVM VIOS 4.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16872?
Apply vendor patch/workaround; isolate affected hosts and restrict network access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via stack-based buffer overflow; attacker can execute arbitrary code, likely with root privileges on affected hosts.
Immediate action required
- affected7.2
- affected7.3
- affected4.1
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.