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Vulnerability · Published May 7, 2024 · Assigned by zdi

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

High 7.5

In plain English

A high-severity double free in Kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)7.5High
Exploit odds (30 days)0.2%top 90.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-1DEBIAN-CVE-2021-34981
Debian:13linux5.10.46-1DEBIAN-CVE-2021-34981
Debian:14linux5.10.46-1DEBIAN-CVE-2021-34981
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-34981
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-34981
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-34981

Affected products (as reported)

VendorProductVersions
Linux Kernel 4.15.0-118-generic

Weakness: CWE-415 · Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

References