CVE-2026-98747
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 insta…
Overview
CVE-2026-98747 is a known-severity vulnerability. It was published on October 18, 2026.
Technical 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.
Remediation
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
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Frequently asked questions
What is CVE-2026-98747?
CVE-2026-98747 is a known-severity vulnerability. It was published on October 18, 2026.
How severe is CVE-2026-98747?
CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.
How do I fix or remediate CVE-2026-98747?
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-98747?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98747 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.