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7.5highHigh

CVE-2026-18821

Ibm Power System S1122 \(9824-22a\) Firmware

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 Power Systems Firmware is affected by a vulnerability in partition firmware during network boot. An unauthenticated attacker on the same network as a partition undergoing network boot can send a malformed packet, allowing arbitrary code to be executed in the partition firmware and compromising everything subsequently loaded by that partition. Other partitions and the managed system are not affected. Only partitions actively performing a network boot are affected, resulting in a confidentiality, integrity, and availability impact.

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is reachable only from the same local or logical network.
  • For an attacker who can reach it, exploitation depends on conditions outside the attacker's control.
  • To exploit it, no account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
7.5 (v3.1)
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Assigned by
psirt@us.ibm.com

Dates

Published
2026-08-19
Last modified
2026-08-25
Sources
NVD

Affected products

  • Ibm Power System S1122 \(9824-22a\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System S1122 \(9824-22a\)all versions
  • Ibm Power System S1124 \(9824-42a\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System S1124 \(9824-42a\)all versions
  • Ibm Power System S1122s \(9824-22b\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System S1122s \(9824-22b\)all versions
  • Ibm Power System S1114 \(9824-41b\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System S1114 \(9824-41b\)all versions
  • Ibm Power System L1122 \(9856-22h\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System L1122 \(9856-22h\)all versions
  • Ibm Power System L1124 \(9856-42h\) Firmwarefw1110.00 - fw1110.31, fw1120.00
  • Ibm Power System L1124 \(9856-42h\)all versions

As listed in the NVD configuration data. Not a statement about your estate.

References