Udisks: out-of-bounds read in udisks daemon

Summary

A flaw was found in the Udisks daemon, where it allows unprivileged users to create loop devices using the D-BUS system. This is achieved via the loop device handler, which handles requests sent through the D-BUS interface. As two of the parameters of this handle, it receives the file descriptor list and index specifying the file where the loop device should be backed. The function itself validates the index value to ensure it isn't bigger than the maximum value allowed. However, it fails to validate the lower bound, allowing the index parameter to be a negative value. Under these circumstances, an attacker can cause the UDisks daemon to crash or perform a local privilege escalation by gaining access to files owned by privileged users.

Timeline

1. Aug 28, 2025, 2:47 PM UTCCVE published
2. Aug 28, 2025, 4:20 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Jun 29, 2026, 8:47 PM UTCRecord last updated

Affected versions

• udisks2

  fixed in 2.10.2; From 2.10.3 · fixed in 2.10.91

• udisks2

  Version range not reported

• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks2

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• udisks

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References 14