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Serious security flaw in Canonical's LXD and MicroCloud allows unauthorized login

A maximum-severity flaw in Canonical LXD and MicroCloud permits client impersonation without private keys, leading to potential root access.

Read about affected versions and snap updates.


To pull off the spoofing, one would need network access to the system and the public certificate of a user the system already trusted, which is not secret. If the account the attacker managed to impersonate had elevated privileges, they could gain full administrator access to the host machine, according to Canonical.

Who is affected and what was fixed?

The issue affected specific versions of LXD, including 4.0.14, 5.0.10, 5.21.8, and 6.9, before their respective fixes were released. Canonical released fixes via software updates, including LXD versions 6.10.1, 5.21.9, 5.0.11, 4.0.15, and MicroCloud 3.4.1 and 2.1.5.

At the same time, the Incus project identified this same issue, releasing the fixed version 7.6.0.

Attack status and instructions

According to the authorities and Canonical's assessments, there is no public evidence that the problem has been used in real attacks so far.

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Users are urged to update their installations immediately using the relevant program update commands.

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