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CVE-2023-52456

5.5 · MEDIUM

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…

Published Feb 23, 2024CWE-667EPSS 0.18%

Overview

CVE-2023-52456 is a medium-severity vulnerability. It was published on February 23, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06Refgit.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfdaRefgit.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181Refgit.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0Refgit.kernel.org/stable/c/9a662d06c22ddfa371958c2071dc350436be802bRefgit.kernel.org/stable/c/ff168d4fdb0e1ba35fb413a749b3d6cce918ec19Refgit.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06Refgit.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfdaRefgit.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181Refgit.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0

How CyberStrike helps

Frequently asked questions

What is CVE-2023-52456?

CVE-2023-52456 is a medium-severity vulnerability. It was published on February 23, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-52456?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-52456?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-52456?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-52456 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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