Is CVE-2026-16821 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16821?

CVE-2026-16821 has a CVSS v3 severity of HIGH (7).

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Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to a format string vulnerability.