drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64219
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:49 UTC
Updated2026-07-24 16:16:49 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 d6590e3f766e3111dd1beaf88b9384d117acfa6b git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 16a5fa57565afb6bf37e18129921c270c93d8e2b git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 90c398e822ca76e40548df0c061dd4f93ea92d71 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 3265f3ed373fb8048be713aadcdf702579a0e53d git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 1ecde19bfce6535bffddad1139ff466b6d401b8e git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 1c8c6e912f2945b2a3e669afca6b52174b88e86e git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6c92f6d9600efa3ef0d9e560a2b52776d9803c29 git Not specified
CNA Linux Linux affected 5.15.209 semver Not specified
CNA Linux Linux affected 6.1.175 semver Not specified
CNA Linux Linux affected 6.6.142 semver Not specified
CNA Linux Linux affected 6.12.92 semver Not specified
CNA Linux Linux affected 6.18.34 semver Not specified
CNA Linux Linux affected 7.0.11 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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