CVE-2022-28656

Local service interruption via unbounded D-Bus output

Published Jun 4, 2024 · Updated Mar 19, 2025

Resource exhaustion in Canonical Apport before 2.21.0 allows local users to interrupt service by triggering D-Bus output capture. The is_closing_session() routine launches gdbus against an address read from the crashing process and buffers its stdout and stderr without an output limit. A low-privileged user must cause Apport to process a crash with an attacker-controlled session bus; a responsive endpoint can then exhaust Apport's memory and disrupt availability.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in Canonical Apport before 2.21.0 allows local users to interrupt service by triggering D-Bus output capture. The is_closing_session() routine launches gdbus against an address read from the crashing process and buffers its stdout and stderr without an output limit. A low-privileged user must cause Apport to process a crash with an attacker-controlled session bus; a responsive endpoint can then exhaust Apport's memory and disrupt availability.

The record

CVE
CVE-2022-28656
Published
Jun 4, 2024
Updated
Mar 19, 2025
Vendor
Canonical
Product
Apport
Classifications
CWE-770, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.21.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Canonical · Apportversion=0 <2.21.0

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo