CVE-2026-55222

Published: Ott 23, 2026 Last Modified: Ott 23, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,1
Source: [email protected]
Attack Vector: local
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: high
Availability: none

Description

Isar is an integration system for automated root filesystem generation. In versions 0.11 and newer, /etc/apt/trusted.gpg.d is created manually during bootstrap setup to be able to deploy local keys. By that, the directory is owned by the calling user (the one that executes Isar) instead of root. If the calling user's id is identical to one of an unprivileged user inside the image, this user is able to alter existing keys and deploy new ones, silently breaking the apt repo integrity protection. The issue is has no impact on those images that use an immutable rootfs, or if apt is never invoked. Changing only the keys does not trigger an exploit, it's just one step in a chain. An attacker would also have to manipulate a remote repo or intercept non-secure communication with it. This issue has been patched via commit 29e84ed.

1290

Incorrect Decoding of Security Identifiers

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Availability Access Control
Potential Impacts:
Modify Memory Read Memory Dos: Resource Consumption (Other) Execute Unauthorized Code Or Commands Gain Privileges Or Assume Identity Quality Degradation
Applicable Platforms
Technologies: Bus/Interface Hardware, Not Technology-Specific
View CWE Details
https://github.com/ilbers/isar/commit/29e84ed301c8d25c57030…
https://github.com/ilbers/isar/commit/29e84ed301c8d25c570300cf82b563b7961392b0
https://github.com/ilbers/isar/security/advisories/GHSA-rq6…
https://github.com/ilbers/isar/security/advisories/GHSA-rq66-pfw5-whqq