CVE-2026-93120
UnknownSummary
In the Linux kernel, os_desc_qw_sign_show() in the USB gadget configfs driver passed OS_STRING_QW_SIGN_LEN (14) as the input length to utf16s_to_utf8s(), but that argument counts UTF-16 code units while the qw_sign[] array holds only 7 units. When the stored signature fills the array without a NUL terminator, the conversion reads up to 7 units past the end of qw_sign[], exposing adjacent bytes of struct gadget_info through the configfs attribute.
Risk Assessment
The vulnerability allows an out-of-bounds read and leakage of kernel memory through a configfs attribute. This may expose sensitive information or facilitate further attacks on the system.
Recommendation
Update the Linux kernel to a version containing the USB gadget configfs driver fix. Restrict access to configfs attributes to authorized users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS