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CVE-2025-39705 – drm/amd/display: fix a Null pointer dereference vulnerability

The following table lists the changes that have been made to the
CVE-2025-39705 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:

    drm/amd/display: fix a Null pointer dereference vulnerability

    [Why]
    A null pointer dereference vulnerability exists in the AMD display driver’s
    (DC module) cleanup function dc_destruct().
    When display control context (dc->ctx) construction fails
    (due to memory allocation failure), this pointer remains NULL.
    During subsequent error handling when dc_destruct() is called,
    there’s no NULL check before dereferencing the perf_trace member
    (dc->ctx->perf_trace), causing a kernel null pointer dereference crash.

    [How]
    Check if dc->ctx is non-NULL before dereferencing.

    (Updated commit text and removed unnecessary error message)
    (cherry picked from commit 9dd8e2ba268c636c240a918e0a31e6feaee19404)
    Added Reference https://git.kernel.org/stable/c/0961673cc5f0055957aa46f25eb4ef6c07e00165
    Added Reference https://git.kernel.org/stable/c/1bcf63a44381691d6192872801f830ce3250e367
    Added Reference https://git.kernel.org/stable/c/4ade995b9b25b3c6e8dc42c27070340f1358d8c8
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