CVE-2026-89740 is a vulnerability in Linux Kernel
Published on September 11, 2026
serial: imx: serialize imx_uart_ports[] lifetime
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.
Products Associated with CVE-2026-89740
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Affected Versions
Linux:- Version dbff4e9ea2e83fda89143389bfb229cb29425a32 and below 681696ae9e4a28bdf54893c807dfe4a6c08e30a5 is affected.
- Version dbff4e9ea2e83fda89143389bfb229cb29425a32 and below 28b932202fcdbeb2ef58d89ce4363f480433c234 is affected.
- Version dbff4e9ea2e83fda89143389bfb229cb29425a32 and below 7429dce56a73bc080a8c072edb167106f73a08ae is affected.
- Version dbff4e9ea2e83fda89143389bfb229cb29425a32 and below 8b0b29fdcb47907ae0296b8fe829e918e05e300f is affected.
- Version 2.6.27 is affected.
- Before 2.6.27 is unaffected.
- Version 6.12.109, <= 6.12.* is unaffected.
- Version 6.18.50, <= 6.18.* is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.