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CVE-2025-39711 – media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls

The following table lists the changes that have been made to the
CVE-2025-39711 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

    Sep. 05, 2025

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

    media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls

    Both the ACE and CSI driver are missing a mei_cldev_disable() call in
    their remove() function.

    This causes the mei_cl client to stay part of the mei_device->file_list
    list even though its memory is freed by mei_cl_bus_dev_release() calling
    kfree(cldev->cl).

    This leads to a use-after-free when mei_vsc_remove() runs mei_stop()
    which first removes all mei bus devices calling mei_ace_remove() and
    mei_csi_remove() followed by mei_cl_bus_dev_release() and then calls
    mei_cl_all_disconnect() which walks over mei_device->file_list dereferecing
    the just freed cldev->cl.

    And mei_vsc_remove() it self is run at shutdown because of the
    platform_device_unregister(tp->pdev) in vsc_tp_shutdown()

    When building a kernel with KASAN this leads to the following KASAN report:

    [ 106.634504] ==================================================================
    [ 106.634623] BUG: KASAN: slab-use-after-free in mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei
    [ 106.634683] Read of size 4 at addr ffff88819cb62018 by task systemd-shutdow/1
    [ 106.634729]
    [ 106.634767] Tainted: [E]=UNSIGNED_MODULE
    [ 106.634770] Hardware name: Dell Inc. XPS 16 9640/09CK4V, BIOS 1.12.0 02/10/2025
    [ 106.634773] Call Trace:
    [ 106.634777]
    …
    [ 106.634871] kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:636)
    [ 106.634901] mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei
    [ 106.634921] mei_cl_all_disconnect (drivers/misc/mei/client.c:2165 (discriminator 4)) mei
    [ 106.634941] mei_reset (drivers/misc/mei/init.c:163) mei
    …
    [ 106.635042] mei_stop (drivers/misc/mei/init.c:348) mei
    [ 106.635062] mei_vsc_remove (drivers/misc/mei/mei_dev.h:784 drivers/misc/mei/platform-vsc.c:393) mei_vsc
    [ 106.635066] platform_remove (drivers/base/platform.c:1424)

    Add the missing mei_cldev_disable() calls so that the mei_cl gets removed
    from mei_device->file_list before it is freed to fix this.
    Added Reference https://git.kernel.org/stable/c/0c92c49fc688cfadacc47ae99b06a31237702e9e
    Added Reference https://git.kernel.org/stable/c/1dfe73394dcfc9b049c8da0dc181c45f156a5f49
    Added Reference https://git.kernel.org/stable/c/3c0e4cc4f55f9a1db2a761e4ffb27c9594245888
    Added Reference https://git.kernel.org/stable/c/639f5b33fcd7c59157f29b09f6f2866eacf9279c
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