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K
zdiRyota Shiga(@Ga_ryo_) of Flatt SecurityZDI-21-1223
HistoryOct 21, 2021 - 12:00 a.m.

Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability

2021-10-2100:00:00
Ryota Shiga(@Ga_ryo_) of Flatt Security
www.zerodayinitiative.com
26

7.5 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

3.4 Low

CVSS2

Access Vector

LOCAL

Access Complexity

HIGH

Authentication

MULTIPLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:H/Au:M/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

28.7%

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.

7.5 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

3.4 Low

CVSS2

Access Vector

LOCAL

Access Complexity

HIGH

Authentication

MULTIPLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:H/Au:M/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

28.7%