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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
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| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
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No data available yet.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | usb: gadget: configfs: fix out-of-bounds read of qw_sign | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:11:26.548Z
Reserved: 2026-09-17T16:02:15.086Z
Link: CVE-2026-93120
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:18:06.667
Modified: 2026-09-17T17:18:06.667
Link: CVE-2026-93120
Redhat
No data.
OpenCVE Enrichment
No data.
No weakness.