AppArmor Base Profile Misconfiguration in snapd Permits Confined Snaps Unauthorized Access to Hashed Passwords via systemd-userdbd

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-5300
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 15:16:29 UTC
Updated2026-07-22 19:16:53 UTC
DescriptionAn access control bypass and information disclosure vulnerability exists in the base AppArmor security profile configuration of Canonical snapd. The abstraction rules located in /etc/apparmor.d/abstractions/nss-systemd (inherited via ) inadvertently permit strictly confined snap applications, which lack the privileged account-control interface, to interact directly with the io.systemd.Multiplexer and io.systemd.NameServiceSwitch UNIX domain sockets under /run/systemd/userdb/. On systems where the systemd-userdbd service is installed and operational, the service fails to distinguish between an unconfined root user on the host system and a restricted root user running within a snap application's sandbox (such as a daemon or configuration hook). Because systemd-userdbd returns "complete" user records—including sensitive hashed user passwords from /etc/shadow—when queried by a process running as root, a compromised or malicious strictly confined snap executing code as root can successfully query the Varlink interface to retrieve all system password hashes, bypassing intended snap sandbox restrictions. This issue is mitigated by the fact that systemd-userdbd is not installed by default on standard Ubuntu deployments.

Risk And Classification

Primary CVSS: v3.1 5.6 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.000990000 probability, percentile 0.009760000 (date 2026-07-22)

Problem Types: CWE-212 | CWE-212 CWE-212 Improper removal of sensitive information before storage or transfer

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.6MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNACVSS5.6MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical Ubuntu 26.04 LTS unaffected 2.76+ubuntu26.04.3 dpkg Linux
CNA Canonical Ubuntu 24.04 LTS unaffected 2.76+ubuntu24.04.1 dpkg Linux
CNA Canonical Ubuntu 22.04 LTS unaffected 2.76+ubuntu22.04.1 dpkg Linux
CNA Canonical Ubuntu 20.04 LTS unaffected 2.67.1+20.04ubuntu1~esm2 dpkg Linux
CNA Canonical Ubuntu 18.04 LTS unaffected 2.61.4ubuntu0.18.04.1+esm3 dpkg Linux
CNA Canonical Ubuntu 16.04 LTS unaffected 2.61.4ubuntu0.16.04.1+esm3 Linux

References

ReferenceSourceLinkTags
ubuntu.com/security/CVE-2024-5300 [email protected] ubuntu.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: James Henstridge (en)

© CVE.report 2026

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