CVE-2021-34981

Aliases:UBUNTU-CVE-2021-34981DEBIAN-CVE-2021-34981
Advisory lineage Upstream: 0 Downstream: 21
Analyzed
Published: 07 May 2024, 22:54
Last modified:04 Aug 2024, 00:26

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.0 (cve.org)
EPSS Score
0.2% LOW
0% probability +0.19%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

07 May 2024, 22:54
Published
Vulnerability first disclosed
04 Aug 2024, 00:26
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • v3.0•HIGH•Score: 7.5CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.20%• Percentile: 10%

Techniques & Countermeasures

  • CWE-415•Double Free

    The product calls free() twice on the same memory address.

Affected Systems

  • debian•linux

    < 5.10.46-1 | < 5.10.46-1 | < 5.10.46-1 | < 5.10.46-1

  • ubuntu•linux

    all

  • ubuntu•linux-aws

    all

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    all

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-fips

    all

  • ubuntu•linux-aws-hwe

    all

  • ubuntu•linux-azure

    all | all

  • ubuntu•linux-azure-4.15

    all

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    all

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fde-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    all

  • ubuntu•linux-bluefield

    all | all

  • ubuntu•linux-fips

    all

  • ubuntu•linux-gcp

    all | all

  • ubuntu•linux-gcp-4.15

    all

  • ubuntu•linux-gcp-5.11

    all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    all

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    all

  • ubuntu•linux-gkeop

    all

  • ubuntu•linux-gkeop-5.4

    all

  • ubuntu•linux-hwe

    all | all

  • ubuntu•linux-hwe-5.11

    all

  • ubuntu•linux-hwe-5.4

    all

  • ubuntu•linux-hwe-5.8

    all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-ibm

    all

  • ubuntu•linux-ibm-5.4

    all

  • ubuntu•linux-intel-5.13

    all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-iot

    all

  • ubuntu•linux-kvm

    all

  • ubuntu•linux-lts-xenial

    all

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.10

    all

  • ubuntu•linux-oem-5.13

    < 5.13.0-1014.18

  • ubuntu•linux-oem-5.6

    all

Showing first 50 affected entries in server-rendered view.

References (5)