Dell Pre-Boot Authentication Driver PBADRV.sys IOCTL access control

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Dell Pre-Boot Authentication Driver (Hardware Driver Software). It has been rated as problematic. This issue affects some unknown functionality in the library PBADRV.sys. The manipulation with the input value 0x0022201c leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Dell Pre-Boot Authentication Driver (PBADRV.sys) allows local users to write to arbitrary physical memory locations and gain privileges via a 0x0022201c IOCTL call.

The weakness was disclosed 01/08/2016 by Matt Bergin (Website). The advisory is shared at The identification of this vulnerability is CVE-2015-6856 since 09/10/2015. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The exploit is available at It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 79643†).







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.6
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NVD Base Score: 7.8
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Class: Access control
CWE: CWE-264

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Recommended: no mitigation known
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0-Day Time: 🔍


09/10/2015 🔍
12/18/2015 +99 days 🔍
01/08/2016 +21 days 🔍
01/08/2016 +0 days 🔍
01/10/2016 +2 days 🔍
06/18/2024 +3082 days 🔍



Advisory: 134987
Researcher: Matt Bergin
Status: Not defined

CVE: CVE-2015-6856 (🔍)
SecurityFocus: 79643 - Dell Pre-Boot Authentication Driver CVE-2015-6856 Local Privilege Escalation Vulnerability

scip Labs:


Created: 01/10/2016 08:10 PM
Updated: 06/18/2024 02:48 PM
Changes: 01/10/2016 08:10 PM (59), 06/06/2018 10:56 AM (4), 07/02/2022 02:58 PM (3), 06/18/2024 02:48 PM (23)
Complete: 🔍
Cache ID: 3:4E9:40


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