CVE-2026-33542
Description
A flaw was found in Incus, a system container and virtual machine manager. A remote attacker could exploit a lack of validation of image fingerprints when downloading from simplestreams image servers. This vulnerability, under specific conditions, could lead to image cache poisoning, allowing an attacker to expose other tenants to running their controlled images instead of the expected ones.
Statement
This Important vulnerability in Incus, a system container and virtual machine manager, stems from insufficient image fingerprint validation during downloads from simplestreams image servers. Under specific conditions, this could lead to image cache poisoning, allowing an attacker to expose other tenants to running controlled images. This issue primarily affects community projects such as Fedora.
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Modify Application Data; Other
Integrity checks usually use a secret key that helps authenticate the data origin. Skipping integrity checking generally opens up the possibility that new data from an invalid source can be injected.
Integrity,Other
Technical Impact: Other
Data that is parsed and used may be corrupted.
Non-Repudiation,Other
Technical Impact: Hide Activities; Other
Without a checksum check, it is impossible to determine if any changes have been made to the data after it was sent.
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