udisks: Out-of-bounds Read

What to do

1. Update udisks to 2.10.2 or 2.10.91, whichever matches your release line, or a later version.

Affected products and versions

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector

LocalThe attacker needs local access or must trick a user into running something.

Attack complexity

LowNo special conditions are needed; the attack works reliably.

Privileges required

NoneNo account or login is needed.

User interaction

NoneNo action by a victim is required.

Scope

ChangedThe attack can reach beyond the vulnerable component into other systems.

Confidentiality

LowSome restricted data can be read.

Integrity

LowLimited modification of data is possible.

Availability

HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H. Scored by CNA (redhat.com).

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

Timeline

1. August 28, 2025CVE record published.
2. August 28, 2025CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
3. November 4, 2026Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

• 9.1 Critical severity

  libbiosig: Out-of-bounds Read

  CVE-2025-52461Aug 25, 2025The Biosig Project
• 7.1 High severity

  Linux: Out-of-bounds Read

  CVE-2025-38657Aug 22, 2025Linux
• 7.1 High severity

  Linux: Out-of-bounds Read

  CVE-2025-38652Aug 22, 2025Linux
• 7.1 High severity

  Linux: Out-of-bounds Read

  CVE-2025-38636Aug 22, 2025Linux
• 7.1 High severity

  Linux: Out-of-bounds Read

  CVE-2025-38616Aug 22, 2025Linux
• 7.1 High severity

  Linux: Out-of-bounds Read

  CVE-2025-38599Aug 19, 2025Linux

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