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vulnrichmentZdiVULNRICHMENT:CVE-2021-34981
HistoryMay 07, 2024 - 10:54 p.m.

CVE-2021-34981 Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability

2024-05-0722:54:49
CWE-415
zdi
github.com
3
linux kernel
bluetooth
cmtp module
double free
privilege escalation
vulnerability
local attackers
high-privileged code
zdi-can-11977

CVSS3

7.5

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

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

28.8%

SSVC

Exploitation

none

Automatable

no

Technical Impact

total

Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. 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. Was ZDI-CAN-11977.

CNA Affected

[
  {
    "vendor": "Linux",
    "product": "Kernel",
    "versions": [
      {
        "version": "4.15.0-118-generic",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  }
]

CVSS3

7.5

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

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

28.8%

SSVC

Exploitation

none

Automatable

no

Technical Impact

total