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CVE-2021-3997

Published: 10 January 2022

A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp.

Notes

AuthorNote
alexmurray
This vulnerability does not appear to be exploitable for systemd versions before v242 (ie before commit e535840) and onwards hence this is not possible to be exploited on Ubuntu 18.04 LTS and earlier.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
systemd
Launchpad, Ubuntu, Debian
upstream Needs triage

bionic Ignored
(cannot be exploited)
focal
Released (245.4-4ubuntu3.15)
hirsute
Released (247.3-3ubuntu3.7)
impish
Released (248.3-1ubuntu8.2)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H