# CVE-2026-89740

## Summary

- **CVE ID:** CVE-2026-89740
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

serial: imx: serialize imx_uart_ports[] lifetime

imx_uart_probe() publishes its devm-allocated port in imx_uart_ports[]
before uart_add_one_port() because console setup uses the table. The entry
is not cleared when adding the port fails or after removal, leaving a
dangling pointer.

A sibling probe can register the shared console through that stale entry.
This was reproduced under KASAN on QEMU mcimx6ul-evk by unbinding a
sibling UART, unbinding the console UART and rebinding the sibling.

Keep the entry valid through uart_remove_one_port(), then clear it. Protect
port addition and removal together with their table updates so sibling
operations cannot interleave. Reject an occupied slot rather than
clobbering an active port during a duplicate-line probe.

## Affected Products

- Linux — Linux (dbff4e9ea2e83fda89143389bfb229cb29425a32)
- Linux — Linux (2.6.27)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/681696ae9e4a28bdf54893c807dfe4a6c08e30a5)
- [CNA](https://git.kernel.org/stable/c/28b932202fcdbeb2ef58d89ce4363f480433c234)
- [CNA](https://git.kernel.org/stable/c/7429dce56a73bc080a8c072edb167106f73a08ae)
- [CNA](https://git.kernel.org/stable/c/8b0b29fdcb47907ae0296b8fe829e918e05e300f)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-20._