CVE-2022-2526

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.

Published: 2022-09-09 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-2526 is rated Moderate Risk (57.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.28%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-2526

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-16 0.25% 0.28% +0.03%
2 2026-02-10 0.26% 0.25% -0.02%
3 2026-01-10 — 0.26% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-2526

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2022-2526

OS Trackers for CVE-2022-2526

vendor priority summary link
debian not yet assigned CVE-2022-2526 not yet assigned priority: Debian including 1 source packages (systemd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-2526
redhat high — https://access.redhat.com/security/cve/CVE-2022-2526
suse high CVE-2022-2526 severity important: SUSE including 34 source package names (libgudev1-219-78.el7_9.7, libgudev1-devel-219-78.el7_9.7, …), 315 product×package rows across 39 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (39 product lines)): Known Not Affected 297, Fixed 18. https://www.suse.com/security/cve/CVE-2022-2526/
ubuntu medium CVE-2022-2526 medium priority: Ubuntu including 1 source packages (systemd), 6 status rows across 6 suites (bionic, focal, jammy, trusty, upstream, xenial): not-affected 4, released 2. https://ubuntu.com/security/CVE-2022-2526

Affected software / configurations for CVE-2022-2526

Vendor Product Version Raw CPE
systemd_project systemd 240 cpe:2.3:a:systemd_project:systemd:240:*:*:*:*:*:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
netapp h300s_firmware — cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
netapp h500s_firmware — cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
netapp h700s_firmware — cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware — cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*

References for CVE-2022-2526

cvelogic Threat Intelligence