Vulnerability · Published Aug 19, 2026 · Assigned by ibm
CVE-2026-16855Vulnerabilities in IBM AIX and PowerVM VIOS
Medium 5.5
In plain English
A medium-severity out-of-bounds write in AIX from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to a heap buffer overflow.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| IBM | AIX | 7.27.3 |
| IBM | PowerVM VIOS | 4.1 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://www.ibm.com/support/pages/node/7283858 vendor-advisory, patch