CVE-2021-3899

HIGH

Linux - Code Injection

Title source: llm
STIX 2.1

Description

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

Exploits (1)

nomisec WORKING POC 3 stars
by liumuqing · poc
https://github.com/liumuqing/CVE-2021-3899_PoC

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory
https://ubuntu.com/security/notices/USN-5427-1
Third Party Advisory issue-tracking
https://www.cve.org/CVERecord?id=CVE-2021-3899

Scores

CVSS v3 7.8
EPSS 0.0225
EPSS Percentile 84.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-367
Status published
Products (5)
canonical/apport < 2.21.0
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 20.04
canonical/ubuntu_linux 21.10
canonical/ubuntu_linux 22.04
Published Jun 03, 2024
Tracked Since Feb 18, 2026