CyberSecBulletin
CVE-2026-16707NVD status: Analyzed

PowerVM Hypervisor: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-16707 is a high-severity out-of-bounds read vulnerability in PowerVM Hypervisor from IBM, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited with local access to the system by an attacker with administrator privileges, without any action from a user. Affected PowerVM Hypervisor versions: FW1120.00; FW1110.00 through FW1110.30; FW1060.00 through FW1060.80, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.17% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Power System S1122 (9824-22a) Firmware to fw1110.31 or a later version.
  2. Update Power System S1124 (9824-42a) Firmware to fw1110.31 or a later version.
  3. Update Power System S1122s (9824-22b) Firmware to fw1110.31 or a later version.
  4. Read the advisory on ibm.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
IBMPowerVM HypervisorFW1120.00; FW1110.00 through FW1110.30; FW1060.00 through FW1060.80; FW950.00 through FW950.H2Not stated
IBMPower System S1122 (9824-22a) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System S1124 (9824-42a) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System S1122s (9824-22b) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System S1114 (9824-41b) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System L1122 (9856-22h) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System L1124 (9856-42h) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System E1150 (9043-mru) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System S1112 (9242-21b) Firmwarefw1120.00Not stated
IBMPower System S1112 (9242-21t) Firmwarefw1120.00Not stated
IBMPower System E1080 (9080-hex) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System S1022 (9105-22a) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System S1024 (9105-42a) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System S1022s (9105-22b) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System S1014 (9105-41b) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System L1022 (9786-22h) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System L1024 (9786-42h) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System E1050 (9043-mrx) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System S1012 (9028-21b) Firmwarefw1060.00 up to, but not including, fw1060.81fw1060.81
IBMPower System E1180 (9080-heu) Firmwarefw1110.00 up to, but not including, fw1110.31; fw1120.00fw1110.31
IBMPower System S922 (9009-22g) Firmwarefw950.00 up to, but not including, fw950.h3fw950.h3
IBMPower System H922 (9223-22s) Firmwarefw950.00 up to, but not including, fw950.h3fw950.h3
IBMPower System S914 (9009-41g) Firmwarefw950.00 up to, but not including, fw950.h3fw950.h3
IBMPower System S924 (9009-42g) Firmwarefw950.00 up to, but not including, fw950.h3fw950.h3
IBMPower System H924 (9223-42s) Firmwarefw950.00 up to, but not including, fw950.h3fw950.h3

Version data comes from the organisation that assigned the CVE; 2 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
HighAdministrator-level access is required first.
User interaction
NoneNo action by a victim is required.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. Scored by CNA (us.ibm.com).

Official description

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in PowerVM Hypervisor

All PowerVM Hypervisor vulnerabilities

Recent Out-of-bounds Read vulnerabilities

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