CVE-2026-47104
MediumCVSS 4.0Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In libusb before version 1.0.30, a one-byte out-of-bounds read vulnerability exists in parse_iad_array() in descriptor.c. An attacker can supply a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size, leading to a read past the end of the malloc allocation.
Risk Assessment
This vulnerability allows an attacker in virtualized environments with USB passthrough to cause a denial of service (DoS) by reading one byte past the end of the allocated memory. It can disrupt applications using libusb, including virtualization systems.
Recommendation
Immediately update libusb to version 1.0.30 or later, which contains the fix. In virtualized environments with USB passthrough, restrict access to untrusted USB devices.
Original NVD description (English source)
libusb before version 1.0.30 contains a one-byte out-of-bounds read vulnerability in parse_iad_array() in descriptor.c that allows attackers to trigger a denial of service by supplying a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size. Attackers in virtualized environments with USB passthrough can supply crafted descriptors through libusb_get_active_interface_association_descriptors or libusb_get_interface_association_descriptors to read one byte past the end of the malloc allocation, resulting in a denial of service.