libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to crash applications by supplying a malformed USB configuration descriptor where an interface claims bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the remaining buffer size, causing parse_interface() to return early without allocating the endpoint array. Attackers can exploit this flaw through libusb_get_active_config_descriptor or libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a NULL endpoint pointer and crash.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1848 advisory.

    libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to     crash applications by supplying a malformed USB configuration descriptor where an interface claims     bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the     remaining buffer size, causing parse_interface() to return early without allocating the endpoint array.
    Attackers can exploit this flaw through libusb_get_active_config_descriptor or     libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based     descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a     NULL endpoint pointer and crash. (CVE-2026-23679)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of libusbx installed on the remote host is prior to 1.0.21-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3360 advisory.

    libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to     crash applications by supplying a malformed USB configuration descriptor where an interface claims     bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the     remaining buffer size, causing parse_interface() to return early without allocating the endpoint array.
    Attackers can exploit this flaw through libusb_get_active_config_descriptor or     libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based     descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a     NULL endpoint pointer and crash. (CVE-2026-23679)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to     crash applications by supplying a malformed USB configuration descriptor where an interface claims     bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the     remaining buffer size, causing parse_interface() to return early without allocating the endpoint array.
    Attackers can exploit this flaw through libusb_get_active_config_descriptor or     libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based     descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a     NULL endpoint pointer and crash. (CVE-2026-23679)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
322060	Amazon Linux 2023 : libusbx, libusbx-devel, libusbx-tests-examples (ALAS2023-2026-1848)	Nessus	Amazon Linux Local Security Checks	medium
322036	Amazon Linux 2 : libusbx, --advisory ALAS2-2026-3360 (ALAS-2026-3360)	Nessus	Amazon Linux Local Security Checks	medium
318007	Linux Distros Unpatched Vulnerability : CVE-2026-23679	Nessus	Misc.	medium

Detections

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CVE-2026-23679

medium

Tenable Plugins

medium

medium

medium