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Use After Free Affecting systemd package, versions <237-3ubuntu10.56

medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.21% (59th percentile)
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NVD
9.8 critical
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Red Hat
9.8 critical

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  • Snyk ID SNYK-UBUNTU1804-SYSTEMD-2992447
  • published 25 Aug 2022
  • disclosed 9 Sep 2022
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Introduced: 25 Aug 2022

CVE-2022-2526 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Ubuntu:18.04 systemd to version 237-3ubuntu10.56 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream systemd package and not the systemd package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.