CVE-2025-55095: The function _ux_host_class_storage_media_mount() is responsible for mounting partitions on a USB mass storage device…
CVE-2025-55095 · Severity: medium · CVSS 4.2 · Published 2026-01-27
The function _ux_host_class_storage_media_mount() is responsible for mounting partitions on a USB mass storage device. When it encounters an extended partition entry in the partition table, it recursively calls itself to mount the next logical partition.
This recursion occurs in _ux_host_class_storage_partition_read(), which parses up to four partition entries. If an extended partition is found (with type UX_HOST_CLASS_STORAGE_PARTITION_EXTENDED or EXTENDED_LBA_MAPPED), the code invokes:
_ux_host_class_storage_media_mount(storage, sector + _ux_utility_long_get(...));
There is no limit on the recursion depth or tracking of visited sectors. As a result, a malicious or malformed disk image can include cyclic or excessively deep chains of extended partitions, causing the function to recurse until stack overflow occurs.
No. Junglewise Threat Intelligence has no report of CVE-2025-55095 being exploited in the wild.
How severe is CVE-2025-55095?
Medium severity, with a CVSS score of 4.2, published 27 January 2026.
Which products and versions are affected?
Eclipse Threadx Usbx. The advisory does not name versions.
Is there a fix for CVE-2025-55095?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-55095?
Check whether you run Eclipse Threadx Usbx. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.