Privilege escalation in Insyde NvmExpressDxe driver

Published: 2022-02-03
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41838
Exploitation vector Network
Public exploit N/A
Vulnerable software
Hardware solutions / Drivers


Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Untrusted Pointer Dereference

EUVDB-ID: #VU60275

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41838

CWE-ID: CWE-822 - Untrusted Pointer Dereference

Exploit availability: No


The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to untrusted pointer dereference error in SMM (System Management Mode) branch that registers a SWSMI handler. A remote attacker can use this unsafe pointer "ptr" to read or write or manipulate data in the SMRAM


Install updates from vendor's website.

Vulnerable software versions

NvmExpressDxe: before 5.5: 05.51.42, 5.4: 05.43.42, 5.3: 05.35.42, 5.2: 05.26.42, 5.1: 05.16.42

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.