UBUNTU-CVE-2023-52456

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    UBUNTU-CVE-2023-52456

    Published: 23 Feb 2024Last Modified: 8 Oct 2026
    Upstream:
    CVE-2023-52456
    Aliases:
    USN-6688-1
    USN-6725-1
    USN-6725-2

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2023-52456, https://git.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfda, https://git.kernel.org/stable/c/ff168d4fdb0e1ba35fb413a749b3d6cce918ec19, https://git.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06, https://git.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181, https://git.kernel.org/stable/c/9a662d06c22ddfa371958c2071dc350436be802b, https://git.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0, https://ubuntu.com/security/notices/USN-6688-1, https://ubuntu.com/security/notices/USN-6725-1, https://www.cve.org/CVERecord?id=CVE-2023-52456, https://ubuntu.com/security/notices/USN-6725-2, https://ubuntu.com/security/notices/USN-6818-1, https://ubuntu.com/security/notices/USN-6819-1, https://ubuntu.com/security/notices/USN-6818-2, https://ubuntu.com/security/notices/USN-6819-2, https://ubuntu.com/security/notices/USN-6819-3, https://ubuntu.com/security/notices/USN-6818-3, https://ubuntu.com/security/notices/USN-6818-4, https://ubuntu.com/security/notices/USN-6819-4

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-52456 | CVE-DB