---
cve: "CVE-2026-89740"
severity: "LOW"
cvss: 3.1
epss: "6.4%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:20:04"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T06:07:15+02:00"
---

# CVE-2026-89740

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.109
- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/28b932202fcdbeb2ef58d89ce4363f480433c234>
- <https://git.kernel.org/stable/c/681696ae9e4a28bdf54893c807dfe4a6c08e30a5>
- <https://git.kernel.org/stable/c/7429dce56a73bc080a8c072edb167106f73a08ae>
- <https://git.kernel.org/stable/c/8b0b29fdcb47907ae0296b8fe829e918e05e300f>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89740) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_