CVE-2026-16819
HIGH 7.7IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service and compromise data integrity due to a time-of-check time-of-use race condition.
ELEVATED IMPACT
Severe if exploited (CVSS 7.7), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 2nd percentile
○ In CISA KEV
○ Public exploit / PoC
Impact if exploited
7.7CVSS 3.1 · HIGH
- ConfidentialityNone
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-16819/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-16819/poc.json
Weakness (CWE)
- CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Ibm | Vios | ≥ 4.1.0 and < 4.1.0.50 |
| Ibm | Vios | ≥ 4.1.1.0 and < 4.1.1.30 |
| Ibm | Vios | ≥ 4.1.2.0 and < 4.1.2.20 |
| Ibm | Aix | ≥ 7.2.5 and ≤ 7.2.5.212 |
| Ibm | Aix | ≥ 7.3.2 and ≤ 7.3.2.5 |
| Ibm | Aix | ≥ 7.3.3 and ≤ 7.3.3.2 |
| Ibm | Aix | ≥ 7.3.4 and ≤ 7.3.4.1 |
All CVSS metrics
- HIGH 7.7 v3.1 · CNA Primary
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H - HIGH 7.7 v3.1 · NVD Secondary
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H