What is CVE-2021-34981?

CVE-2021-34981 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10. CVE-2021-34981 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-34981?

CVE-2021-34981 has a CVSS score of 6.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-34981?

No patch is currently available for CVE-2021-34981. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-34981 actively exploited?

CVE-2021-34981 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-34981

Medium

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.

Package Linux Kernel

Published 2024-05-07

Last modified 2025-08-14

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

6.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-415

CVE-2021-34981 is classified as CWE-415

See CWE-415 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-34981 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Zerodayinitiative
https://www.zerodayinitiative.com/advisories/ZDI-21-1223/

Third Party Advisory

Details

CVE ID CVE-2021-34981

Severity Medium

CVSS score 6.7 / 10

CVSS version 3.1

Published 2024-05-07

Modified 2025-08-14

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-34981?

CVE-2021-34981 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10 . CVE-2021-34981 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-34981?

CVE-2021-34981 has a CVSS score of 6.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-34981?

No patch is currently available for CVE-2021-34981. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-34981 actively exploited?

No — CVE-2021-34981 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.