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Vulnerability record · CVE-2026-64219 · published 24 July 2026

CVE-2026-64219: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)

7.0 CVSS 3.1 High EPSS 0.17% · top 94.5% CWE-674 · CWE-674
7.0CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
11 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b Patch
https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e Patch
https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e Patch
https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d Patch
https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29 Patch
https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71 Patch
https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64219), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.