CVE-2026-98753
Received
Received - Intake
TTY Port Activation Failure Restores TTY_IO_ERROR Flag
Vulnerability report for CVE-2026-98753, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
tty: tty_port: restore TTY_IO_ERROR on activation failure
Make sure to restore the TTY_IO_ERROR flag if activation fails to
prevent I/O attempts on a port that is gone or powered down.
This specifically avoids issues like kernel panic due to unclocked
accesses or NULL-pointer dereferences when accessing powered down or
deregistered ports when a TTY ioctl races with hangup and open.
Note that the flag is set again in tty_port_close() but not restoring it
on activation failure leaves a window where drivers fail to handle the
ioctl-hangup race.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 |
| Linux | Linux | a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 |
| Linux | Linux | a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 |
| Linux | Linux | a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 |
| Linux | Linux | 2.6.33 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
