CVE-2021-33910

Publication date 20 July 2021

Last updated 25 August 2025

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

Description

basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

Status

Package Ubuntu Release Status
systemd 22.04 LTS jammy
Fixed 248.3-1ubuntu3
21.10 impish
Fixed 248.3-1ubuntu3
21.04 hirsute
Fixed 247.3-3ubuntu3.4
20.10 groovy
Fixed 246.6-1ubuntu1.7
20.04 LTS focal
Fixed 245.4-4ubuntu3.10
18.04 LTS bionic
Fixed 237-3ubuntu10.49
16.04 LTS xenial
Fixed 229-4ubuntu21.31+esm1
14.04 LTS trusty
Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
systemd

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
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

References

Related Ubuntu Security Notices (USN)

Other references