Remote RCE in enterprise IBM OS (AIX/PowerVM) can fully compromise critical server infrastructure across many organizations.
CVE-2026-16862
Remote stack buffer overflow in IBM AIX/PowerVM enabling remote code execution.
Is CVE-2026-16862 being exploited?
Not confirmed. CVE-2026-16862 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 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-16862?
CVE-2026-16862 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-2026-16862?
Yes. A fix has been recorded for CVE-2026-16862. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16862 affect?
CVE-2026-16862 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-2026-16862?
Isolate affected hosts, restrict management access, monitor vendor advisories and apply patch immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via stack buffer overflow; attacker can run arbitrary code and achieve full system compromise.
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.