VDB-208217 · CVE-2022-2526 · EUVD-2022-34781

systemd DnsStream Object resolved-dns-stream.c on_stream_io/dns_stream_complete use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in systemd. This impacts the function on_stream_io/dns_stream_complete of the file resolved-dns-stream.c of the component DnsStream Object Handler. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2022-2526. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in systemd (affected version not known). This issue affects the function on_stream_io/dns_stream_complete of the file resolved-dns-stream.c of the component DnsStream Object Handler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A use-after-free vulnerability was found in systemd. This issue occurs due to the on_stream_io() function and dns_stream_complete() function in 'resolved-dns-stream.c' not incrementing the reference counting for the DnsStream object. Therefore, other functions and callbacks called can dereference the DNSStream object, causing the use-after-free when the reference is still used later.

The weakness was disclosed 09/10/2022 as d973d94dec349fb676fdd844f6fe2ada3538f27c. The advisory is shared at github.com. The identification of this vulnerability is CVE-2022-2526 since 07/24/2022. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 292749 (MiracleLinux 7 : systemd-219-78.el7.7 (AXSA:2022-3733:06)), which helps to determine the existence of the flaw in a target environment.

Applying the patch d973d94dec349fb676fdd844f6fe2ada3538f27c is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Tenable (292749) and EUVD (EUVD-2022-34781). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

systemd

License

open-source

Website

Product: https://github.com/systemd/systemd/

CPE 2.3info

🔍

CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.6

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 292749
Nessus Name: MiracleLinux 7 : systemd-219-78.el7.7 (AXSA:2022-3733:06)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: d973d94dec349fb676fdd844f6fe2ada3538f27c

Timelineinfo

07/24/2022 🔍
09/10/2022 +48 days 🔍
09/10/2022 +0 days 🔍
05/26/2026 +1354 days 🔍

Sourcesinfo

Product: github.com

Advisory: d973d94dec349fb676fdd844f6fe2ada3538f27c
Status: Confirmed

CVE: CVE-2022-2526 (🔍)
GCVE (CVE): GCVE-0-2022-2526
GCVE (VulDB): GCVE-100-208217
EUVD: 🔍

Entryinfo

Created: 09/10/2022 07:47
Updated: 05/26/2026 02:21
Changes: 09/10/2022 07:47 (42), 10/15/2022 08:14 (11), 01/21/2026 00:14 (16), 05/26/2026 02:21 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.