CVE-2023-52456

serial: imx: fix tx statemachine deadlock

State: Published
Severity: Not scored
Published: Feb 23, 2024
Updated: May 11, 2026
Reserved: Feb 20, 2024

Description

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

serial: imx: fix tx statemachine deadlock

When using the serial port as RS485 port, the tx statemachine is used to control the RTS pin to drive the RS485 transceiver TX_EN pin. When the TTY port is closed in the middle of a transmission (for instance during userland application crash), imx_uart_shutdown disables the interface and disables the Transmission Complete interrupt. afer that, imx_uart_stop_tx bails on an incomplete transmission, to be retriggered by the TC interrupt. This interrupt is disabled and therefore the tx statemachine never transitions out of SEND. The statemachine is in deadlock now, and the TX_EN remains low, making the interface useless.

imx_uart_stop_tx now checks for incomplete transmission AND whether TC interrupts are enabled before bailing to be retriggered. This makes sure the state machine handling is reached, and is properly set to WAIT_AFTER_SEND.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	cb1a609236096c278ecbfb7be678a693a70283f1 to before 6e04a9d30509fb53ba6df5d655ed61d607a7cfdaAffected cb1a609236096c278ecbfb7be678a693a70283f1 to before ff168d4fdb0e1ba35fb413a749b3d6cce918ec19Affected cb1a609236096c278ecbfb7be678a693a70283f1 to before 63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06Affected cb1a609236096c278ecbfb7be678a693a70283f1 to before 763cd68746317b5d746dc2649a3295c1efb41181Affected cb1a609236096c278ecbfb7be678a693a70283f1 to before 9a662d06c22ddfa371958c2071dc350436be802bAffected cb1a609236096c278ecbfb7be678a693a70283f1 to before 78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0Affected
LinuxLinux	5.9Affected before 5.9Not affected 5.10.209 through 5.10.Not affected 5.15.148 through 5.15.Not affected 6.1.75 through 6.1.Not affected 6.6.14 through 6.6.Not affected 6.7.2 through 6.7.*Not affected 6.8 and laterNot affected

Product

Versions

LinuxLinux

cb1a609236096c278ecbfb7be678a693a70283f1 to before 6e04a9d30509fb53ba6df5d655ed61d607a7cfdaAffected
cb1a609236096c278ecbfb7be678a693a70283f1 to before ff168d4fdb0e1ba35fb413a749b3d6cce918ec19Affected
cb1a609236096c278ecbfb7be678a693a70283f1 to before 63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06Affected
cb1a609236096c278ecbfb7be678a693a70283f1 to before 763cd68746317b5d746dc2649a3295c1efb41181Affected
cb1a609236096c278ecbfb7be678a693a70283f1 to before 9a662d06c22ddfa371958c2071dc350436be802bAffected
cb1a609236096c278ecbfb7be678a693a70283f1 to before 78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0Affected

LinuxLinux

5.9Affected
before 5.9Not affected
5.10.209 through 5.10.*Not affected
5.15.148 through 5.15.*Not affected
6.1.75 through 6.1.*Not affected
6.6.14 through 6.6.*Not affected
6.7.2 through 6.7.*Not affected
6.8 and laterNot affected

References

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