CVE-2026-93120

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: configfs: fix out-of-bounds read of qw_sign

os_desc_qw_sign_show() passes OS_STRING_QW_SIGN_LEN as the input

length to utf16s_to_utf8s(), but that argument counts UTF-16 code

units while OS_STRING_QW_SIGN_LEN (14) is the byte size of qw_sign[].

The array holds only OS_STRING_QW_SIGN_LEN / 2 (7) code units, so the

conversion reads up to 7 units (14 bytes) past the end of qw_sign[]

into the following members of struct gadget_info when the stored

signature fills the array without a NUL terminator, exposing those

bytes through the configfs attribute.

The store path halves the count for its input bound but passes the

full byte count as the utf8s_to_utf16s() output limit; use the

destination code-unit count in both directions.