drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
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)
CVE-2026-64219
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64219
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "d6590e3f766e3111dd1beaf88b9384d117acfa6b",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "16a5fa57565afb6bf37e18129921c270c93d8e2b",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "90c398e822ca76e40548df0c061dd4f93ea92d71",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "3265f3ed373fb8048be713aadcdf702579a0e53d",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "1ecde19bfce6535bffddad1139ff466b6d401b8e",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "1c8c6e912f2945b2a3e669afca6b52174b88e86e",
"versionType": "git"
},
{
"status": "affected",
"version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
"lessThan": "6c92f6d9600efa3ef0d9e560a2b52776d9803c29",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/dc/core/dc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/dc/core/dc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64219
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40975 · Revision 1
- Added to Heist Feed
- Publisher date