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CVE-2026-4936

MEDIUM 5.1

Published 2026-08-19 · Last modified 2026-08-20

IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC could exploit this weakness to derive the encryption key and access the data.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 1st percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

5.1CVSS 3.1 · MEDIUM

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ⚠Access: Must sit on the same / adjacent network
  • ⚠Privileges: Requires an admin / high-privilege account
  • ⚠User interaction: A user must take an action (click / open a file)
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-4936/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-2026-4936/poc.json

Affected

Vendors Ibm

Products Powervm Hypervisor

Weakness (CWE)

  • CWE-331: Insufficient Entropy

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N

All CVSS metrics

  • MEDIUM 5.1 v3.1 · CNA Primary
    CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
  • MEDIUM 5.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N

References

Patches & mitigations

Sources: NVD · CVE.org · EPSS