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CVE-2026-89740

Unknown

Last modified

CVE-2026-89740 is a vulnerability of currently unknown severity. 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.

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= dbff4e9ea2e83fda89143389bfb229cb29425a32, < 681696ae9e4a28bdf54893c807dfe4a6c08e30a5; >= dbff4e9ea2e83fda89143389bfb229cb29425a32, < 28b932202fcdbeb2ef58d89ce4363f480433c234; >= dbff4e9ea2e83fda89143389bfb229cb29425a32, < 7429dce56a73bc080a8c072edb167106f73a08ae; >= dbff4e9ea2e83fda89143389bfb229cb29425a32, < 8b0b29fdcb47907ae0296b8fe829e918e05e300f
LinuxLinux2.6.27

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-89740?
Severity scoring for CVE-2026-89740 is pending analysis.
How do I fix CVE-2026-89740?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST