CVE-2026-89740
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.
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Exploitation outlook
- Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownCVE-2026-89740: In the Linux kernel, the following vulnerability has been resolved: serial: imx: serialize imx…nvd · 2026-09-11
- mediumCVE-2026-89740: serial: imx: serialize imx_uart_ports[] lifetimemsrc · 2026-09-08
External references
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