PT-2022-21948 · Insyde · Insydeh2O Uefi Firmware

Published 2022-11-14 · Updated 2025-04-30 · CVE-2022-33986

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions InsydeH2O UEFI firmware Kernel versions prior to 5.4: 05.44.23 InsydeH2O UEFI firmware Kernel versions prior to 5.5: 05.52.23

Description The issue concerns DMA attacks on the parameter buffer used by the VariableRuntimeDxe software SMI handler, potentially leading to a Time-of-Check-to-Time-of-Use (TOCTOU) attack. This could result in corruption of SMRAM. The problem was identified during a security review by Insyde engineering.

Recommendations For Kernel versions prior to 5.4: 05.44.23, update to Kernel 5.4: 05.44.23 to resolve the issue. For Kernel versions prior to 5.5: 05.52.23, update to Kernel 5.5: 05.52.23 to resolve the issue.

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2022-33986

Affected Products

Insydeh2O Uefi Firmware

References · 5

• https://insyde.com/security-pledge/SA-2022056 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-33986 · Security Note
• https://osv.dev/vulnerability/CVE-2022-33986 · Vendor Advisory
• https://insyde.com/security-pledge · Vendor Advisory
• https://t.me/cvenotify/120393 · Telegram Post