Medium severity · published Aug 19, 2026
CVE-2026-4937
Power System Insufficient Entropy
6.0
CVSS
0.1%
EPSS
No
On KEV
Description
IBM PowerVM Hypervisor FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 could allow a local attacker with administrative privileges to decrypt encrypted data due to certain hypervisor calls utilizing less entropy than requested.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
PowerVM Hypervisor · IBM
FW1110.00 through FW1110.20; FW1060.00 through FW1060.71; FW950.00 through FW950.H2 · source: vendor
PS
Power System E1050 (9043-mrx) Firmware · Ibm
fw1060.00 before fw1060.81 · source: NVD
PS
Power System E1080 (9080-hex) Firmware · Ibm
fw1060.00 before fw1060.81 · source: NVD
PS
Power System E1150 (9043-mru) Firmware · Ibm
fw1110.00 before fw1110.31; fw1120.00 · source: NVD
PS
Power System E1180 (9080-heu) Firmware · Ibm
fw1110.00 before fw1110.31; fw1120.00 · source: NVD
PS
Power System E950 (9040-mr9) Firmware · Ibm
fw950.00 before fw950.h3 · source: NVD
PS
Power System E980 (9080-m9s) Firmware · Ibm
fw950.00 before fw950.h3 · source: NVD
PS
Power System H922 (9223-22s) Firmware · Ibm
fw950.00 before fw950.h3 · source: NVD
PS
Power System H924 (9223-42s) Firmware · Ibm
fw950.00 before fw950.h3 · source: NVD
PS
Power System L1022 (9786-22h) Firmware · Ibm
fw1060.00 before fw1060.81 · source: NVD
PS
Power System L1024 (9786-42h) Firmware · Ibm
fw1060.00 before fw1060.81 · source: NVD
PS
Power System L1122 (9856-22h) Firmware · Ibm
fw1110.00 before fw1110.31; fw1120.00 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4937
Vendor Advisory
https://www.ibm.com/support/pages/node/7283900
More from PowerVM Hypervisor
9.6
CVE-2026-16687
Power System Buffer Overflow
9.6
CVE-2026-16835
Power System Improper Certificate Validation
8.8
CVE-2026-18821
Power System Out-of-bounds Write
8.8
CVE-2026-17414
Power System Improper Input Validation
8.4
CVE-2026-17091
Power System Integer Overflow