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CVE-2025-38486 – Qualcomm Soundwire QCOM SDM845 Kernel BRK Exception Handler Vulnerability

The following table lists the changes that have been made to the
CVE-2025-38486 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 28, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    soundwire: Revert “soundwire: qcom: Add set_channel_map api support”

    This reverts commit 7796c97df6b1b2206681a07f3c80f6023a6593d5.

    This patch broke Dragonboard 845c (sdm845). I see:

    Unexpected kernel BRK exception at EL1
    Internal error: BRK handler: 00000000f20003e8 [#1] SMP
    pc : qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom]
    lr : snd_soc_dai_set_channel_map+0x34/0x78
    Call trace:
    qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom] (P)
    sdm845_dai_init+0x18c/0x2e0 [snd_soc_sdm845]
    snd_soc_link_init+0x28/0x6c
    snd_soc_bind_card+0x5f4/0xb0c
    snd_soc_register_card+0x148/0x1a4
    devm_snd_soc_register_card+0x50/0xb0
    sdm845_snd_platform_probe+0x124/0x148 [snd_soc_sdm845]
    platform_probe+0x6c/0xd0
    really_probe+0xc0/0x2a4
    __driver_probe_device+0x7c/0x130
    driver_probe_device+0x40/0x118
    __device_attach_driver+0xc4/0x108
    bus_for_each_drv+0x8c/0xf0
    __device_attach+0xa4/0x198
    device_initial_probe+0x18/0x28
    bus_probe_device+0xb8/0xbc
    deferred_probe_work_func+0xac/0xfc
    process_one_work+0x244/0x658
    worker_thread+0x1b4/0x360
    kthread+0x148/0x228
    ret_from_fork+0x10/0x20
    Kernel panic – not syncing: BRK handler: Fatal exception

    Dan has also reported following issues with the original patch
    https://lore.kernel.org/all/[email protected]/

    Bug #1:
    The zeroeth element of ctrl->pconfig[] is supposed to be unused. We
    start counting at 1. However this code sets ctrl->pconfig[0].ch_mask = 128.

    Bug #2:
    There are SLIM_MAX_TX_PORTS (16) elements in tx_ch[] array but only
    QCOM_SDW_MAX_PORTS + 1 (15) in the ctrl->pconfig[] array so it corrupts
    memory like Yongqin Liu pointed out.

    Bug 3:
    Like Jie Gan pointed out, it erases all the tx information with the rx
    information.
    Added Reference https://git.kernel.org/stable/c/207cea8b72fcbdf4e6db178e54186ed4f1514b3c
    Added Reference https://git.kernel.org/stable/c/834bce6a715ae9a9c4dce7892454a19adf22b013
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