CVE-2021-38578
edk2: integer underflow in SmmEntryPoint function leads to potential SMM privilege escalation
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 3, 2022
Updated · April 30, 2026
Description
A flaw was found in edk2. A integer underflow in the SmmEntryPoint function leads to a write into the SMM region allowing a local attacker with administration privileges on the system to execute code within the SMM privileged context. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.4CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
CWE-124 · Buffer Underwrite ('Buffer Underflow')