CVE-2026-16996: Vulnerabilities in IBM AIX and PowerVM VIOS
Analyzed
Published 20-08-2026Last modified 25-08-2026
Vulnerability summary
CVE-2026-16996 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in ibm aix. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.6% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
0.17%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 20-08-2026PublishedVulnerability first disclosed.
- 25-08-2026Last modifiedVulnerability information updated.
Description
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to an integer underflow.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
Increase +0.05 pp
From 0.11% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
- CWE-191Integer Underflow (Wrap or Wraparound)The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
Affected systems
Ibm3 products
- aix7.2 | 7.3 | ≥ 7.2.5, ≤ 7.2.5.212 | ≥ 7.3.2, ≤ 7.3.2.5 | ≥ 7.3.3, ≤ 7.3.3.2 | ≥ 7.3.4, ≤ 7.3.4.1
- powervm vios4.1
- vios≥ 4.1.0, < 4.1.0.50 | ≥ 4.1.1.0, < 4.1.1.30 | ≥ 4.1.2.0, < 4.1.2.20
1 vendor · 3 products