PT-2022-20634 · Insyde · Fvbservicesruntimedxe

Published 2022-11-14 · Updated 2025-04-30 · CVE-2022-31243

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 FvbServicesRuntimeDxe driver versions prior to Kernel 5.2: 05.27.21 FvbServicesRuntimeDxe driver versions prior to Kernel 5.3: 05.36.21 FvbServicesRuntimeDxe driver versions prior to Kernel 5.4: 05.44.21 FvbServicesRuntimeDxe driver versions prior to Kernel 5.5: 05.52.21

Description DMA transactions targeted at input buffers used for the software SMI handler in the FvbServicesRuntimeDxe driver could cause SMRAM corruption through a TOCTOU attack. This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group.

Recommendations For versions prior to Kernel 5.2: 05.27.21, update to Kernel 5.2: 05.27.21 or later. For versions prior to Kernel 5.3: 05.36.21, update to Kernel 5.3: 05.36.21 or later. For versions prior to Kernel 5.4: 05.44.21, update to Kernel 5.4: 05.44.21 or later. For versions prior to Kernel 5.5: 05.52.21, update to Kernel 5.5: 05.52.21 or later.

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2022-31243

Affected Products

Fvbservicesruntimedxe

References · 7

• https://insyde.com/security-pledge/SA-2022044 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2022-31243 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-31243 · Security Note
• https://insyde.com/security-pledge · Vendor Advisory
• https://t.me/cvenotify/120390 · Telegram Post
• https://cert-portal.siemens.com/productcert/pdf/ssa-450613.pdf · Note
• https://t.me/cvenotify/37702 · Telegram Post