Double Free in Linux Kernel
CVE-2021-34981
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.
Vulnerability class: Double Free
EPSS: 0.002 (10.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions 4.15.0-118-generic
- Linux Linux_kernel
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34981?
- CVE-2021-34981 is a medium-severity vulnerability in Linux Kernel, classified under Double Free. CVSS score: 6.7/10. Published 2024-05-07.
- How severe is CVE-2021-34981?
- Medium severity. CVSS v3 base score is 6.7 out of 10.