CVE-2021-36357

CRITICAL

OpenPOWER skiboot - Incorrect Conversion between Numeric Types in unpack_timestamp

Title source: llm
STIX 2.1

Description

An issue was discovered in OpenPOWER 2.6 firmware. unpack_timestamp() calls le32_to_cpu() for endian conversion of a uint16_t "year" value, resulting in a type mismatch that can truncate a higher integer value to a smaller one, and bypass a timestamp check. The fix is to use the right endian conversion function.

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0114
EPSS Percentile 62.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-681
Status published
Products (1)
openpowerfoundation/skiboot 2.6
Published Oct 22, 2021
Tracked Since Feb 18, 2026