IBM Support

Security Bulletin: This Power System update is being released to address CVE 2018-1992

Security Bulletin


POWER9: In response to a buffer overflow vulnerability on the boot loader, a new Power System firmware update is being released to address Common Vulnerabilities and Exposures issue number CVE 2018-1992.

Vulnerability Details

DESCRIPTION: The IBM POWER9 boot firmware's bootloader is responsible for loading and validating the initial boot firmware image that drives the rest of the system's hardware initialization. The bootloader firmware contains a buffer overflow vulnerability such that, if an attacker were able to replace the initial boot firmware image with a very carefully crafted and sufficiently large, malicious replacement, it could cause the bootloader, during the load of that image, to overwrite its own instruction memory and circumvent secure boot protections, install trojans, etc.  The firmware mitigation adds additional checking of the initial boot firmware image's load size and terminates the boot if the size is too big. 
CVSS Base Score: 6.4
CVSS Temporal Score: See
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H)
The firmware update can be obtained from FixCentral by specifying the Product and fix level as specified in this Remediation section.

Affected Products and Versions

Firmware release FW910 is affected.
P9 OpenPOWER releases OP910 and OP920 are affected.


Customers with the products below, install FW910.10 or above.

1) IBM Power System S922 (9009-22A)

2) IBM Power System H922 (9223-22H)

3) IBM Power System S914 (9009-41A)

4) IBM Power System S924 (9009-42A)

5) IBM Power System H924 (9223-42H)

6) IBM Power System L922 (9008-22L)

Customers with the products below running OP910, install OP910.30
1) IBM Power System AC922 (8335-GTG)
Customers with the products below running OP910, install OP910.31
1) IBM Power System AC922 (8335-GTC)

2) IBM Power System AC922 (8335-GTW)

Customers with the product below running OP910, install V0.55.1-20190503/BMC 2.06

1) IBM Power System LC922 (9006-22C)

2) IBM Power System LC922 (5104-22C)

Customers with the products below running OP920, install  V2.10-20190208/ OP920.10/BMC 2.04

1) IBM Power System LC921 (9006-12P)

2) IBM Power System LC922 (9006-22P)

Get Notified about Future Security Bulletins



*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location


[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SGDMMD","label":"Power System AC922 Server (8335-GTC)"},"Component":"","Platform":[{"code":"PF050","label":"BMC"},{"code":"PF009","label":"Firmware"}],"Version":"OP910, OP920, FW910","Edition":"","Line of Business":{"code":"LOB57","label":"Power"}}]

Document Information

Modified date:
07 December 2021