CVE-2026-4936
Low
No strong exploitation signal.
CVSS base
5.1
MEDIUM
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
EPSS — probability of exploitation (30 days)
0.1%
0.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-331
Published 2026-08-19 · modified 2026-08-25
CVSS breakdown
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
| Attack Vector | A | Adjacent |
| Attack Complexity | H | High |
| Privileges Required | H | High |
| User Interaction | R | Required |
| Scope | C | Changed |
| Confidentiality | H | High |
| Integrity | N | None |
| Availability | N | None |
Timeline
- 2026-08-19 — Published (NVD)
- 2026-08-25 — Last modified (NVD)
Description
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.