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CVE-2022-2526

Published: 24 August 2022

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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
systemd
Launchpad, Ubuntu, Debian
jammy Not vulnerable
(249.11-0ubuntu3.4)
xenial Not vulnerable
(code not present)
bionic
Released (237-3ubuntu10.56)
focal Not vulnerable
(245.4-4ubuntu3.17)
upstream
Released (240-1)
trusty Not vulnerable
(code not present)
Patches:
upstream: https://github.com/systemd/systemd/commit/d973d94dec349fb676fdd844f6fe2ada3538f27c (v240)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H