# CVE-2026-98747: serial: core: fix NULL pointer dereference in serial_core_unregister_port()

CVE-2026-98747 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98747 (version 7.2.10-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98747
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98747

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.10-1 | [DEBIAN-CVE-2026-98747](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98747.md) | Oct 19, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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