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CVE-2026-64219 is a memory-safety vulnerability in the Linux kernel AMD display driver, specifically in drm/amd/display function dc_process_dmub_aux_transfer_async(). The function copies payload->length bytes into a fixed 16-byte stack buffer using memcpy, while relying only on an ASSERT() to enforce the size constraint. Because the ASSERT() is ineffective in release builds, an oversized payload can cause a stack-based buffer overflow. The same code path also uses link_index to dereference dc->links[] without validating that the index is within dc->link_count, creating an additional out-of-bounds access condition. The fix replaces the assertion with a hard runtime length check that rejects payloads larger than the destination buffer and adds bounds validation for link_index before dereferencing the links array.
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A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A specific vulnerability affecting Red Hat Enterprise Linux 9 kernel-related packages, referenced in RHSA-2026:57252.
Linux kernel drm/amd/display validation flaw in dc_process_dmub_aux_transfer_async payload length and link_index handling.
A Linux kernel vulnerability in drm/amd/display involving validation of payload length and link_index in dc_process_dmub_aux_transfer_async.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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