CVE-2026-90289 (GCVE-0-2026-90289)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-30 12:35
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Resize MST HDCP per-connector arrays to 32
AMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of
32 connectors. But the way it's used is like MAX_DISPLAY_COUNT.
Hence we're off by one with DRM core, which supports a max of 32
connectors.
Rename AMDGPU_DM_MAX_DISPLAY_INDEX to AMDGPU_DM_MAX_DISPLAY_COUNT
to match its actual use, and increase the size to 32 to match the
originally intended size.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d90f97cb3821c47bdf773dcf6cade143773ec764 Version: 82986fd631fa04bcedaefe11a6b3767601cbe84f Version: 82986fd631fa04bcedaefe11a6b3767601cbe84f Version: 82986fd631fa04bcedaefe11a6b3767601cbe84f Version: 82986fd631fa04bcedaefe11a6b3767601cbe84f Version: 82986fd631fa04bcedaefe11a6b3767601cbe84f Version: 99c444d3c3c43db354b253d9bfac081073dcb484 Version: 6.1.47 ≤ Version: 5.15.128 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1c22294c7d9b3b1c26a18ca4eca8c863a5a0d907",
"status": "affected",
"version": "d90f97cb3821c47bdf773dcf6cade143773ec764",
"versionType": "git"
},
{
"lessThan": "decea8279bec5a35413b2cb8e36951cca308fac0",
"status": "affected",
"version": "82986fd631fa04bcedaefe11a6b3767601cbe84f",
"versionType": "git"
},
{
"lessThan": "ac490fea9fe74f9d9975c5d8250c8719750589cd",
"status": "affected",
"version": "82986fd631fa04bcedaefe11a6b3767601cbe84f",
"versionType": "git"
},
{
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"status": "affected",
"version": "82986fd631fa04bcedaefe11a6b3767601cbe84f",
"versionType": "git"
},
{
"lessThan": "0fa116a17b69a28712cdf209318e345b676d7f6c",
"status": "affected",
"version": "82986fd631fa04bcedaefe11a6b3767601cbe84f",
"versionType": "git"
},
{
"lessThan": "261e0fe4e2c99f687114b64b10b98db964b475f4",
"status": "affected",
"version": "82986fd631fa04bcedaefe11a6b3767601cbe84f",
"versionType": "git"
},
{
"status": "affected",
"version": "99c444d3c3c43db354b253d9bfac081073dcb484",
"versionType": "git"
},
{
"lessThan": "6.1.191",
"status": "affected",
"version": "6.1.47",
"versionType": "semver"
},
{
"lessThan": "5.16",
"status": "affected",
"version": "5.15.128",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"lessThan": "6.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "6.1.47",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "6.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.114",
"versionStartIncluding": "6.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.57",
"versionStartIncluding": "6.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "6.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.15.128",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Resize MST HDCP per-connector arrays to 32\n\nAMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of\n32 connectors. But the way it\u0027s used is like MAX_DISPLAY_COUNT.\nHence we\u0027re off by one with DRM core, which supports a max of 32\nconnectors.\n\nRename AMDGPU_DM_MAX_DISPLAY_INDEX to AMDGPU_DM_MAX_DISPLAY_COUNT\nto match its actual use, and increase the size to 32 to match the\noriginally intended size."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - hdcp_update_display() and update_config() index hdcp_workqueue.aconnector[] with aconnector-\u003ebase.index from drm_connector_init_only()\u0027s ida_alloc_max(..., 31). The path is DRM_IOCTL_MODE_ATOMIC \u2192 drm_mode_atomic_ioctl \u2192 amdgpu_dm_atomic_commit_tail \u2192 amdgpu_dm_update_hdcp()/update_psp_stream_config(); dm_dp_mst_get_modes() is reached from DRM_IOCTL_MODE_GETCONNECTOR. The index is kernel-assigned, not a protocol field.\nAC:L - No race or layout lottery: drm_connector_init_only() can assign index 31, and dm_dp_add_mst_connector() creates MST connectors until that id is used. A DRM-master atomic commit that enables that connector calls update_config(), which does hdcp_w-\u003eaconnector[conn_index] with no bounds check. hdcp_create_workqueue() is created by default on Raven-and-later GPUs.\nPR:L - drm_mode_atomic_ioctl and drm_mode_obj_set_property_ioctl are DRM_MASTER in drm_ioctl.c; drm_mode_getconnector() only calls fill_modes when drm_is_current_master(). logind grants DRM master to the seated unprivileged video/render-group user on typical AMDGPU desktops, laptops, and cloud GPU instances, so init-namespace root is not required.\nUI:N - The DRM-master attacker triggers the OOB with their own DRM_IOCTL_MODE_ATOMIC (stream enable through update_psp_stream_config(), or Content Protection via amdgpu_dm_update_hdcp()) on the index-31 connector; no other user must mount media, open a file, or attach a display on the attacker\u0027s behalf.\nS:U - aconnector[31] overwrites the following hdcp_workqueue.mutex in the same host-kernel AMDGPU HDCP object; the corruption and any oops stay inside that kernel authority and do not cross a KVM/Xen, IOMMU, or sandbox boundary.\nC:H - hdcp_update_display() holds hdcp_w-\u003emutex then reads aconnector[31], which overlays mutex.owner (the locked task_struct *). A non-NULL owner is treated as amdgpu_dm_connector * and drm_connector_put(\u0026...-\u003ebase) follows it. dm_dp_mst_get_modes() also copies hdcp_content_type[31]/content_protection[31] into connector state readable via GETCONNECTOR.\nI:H - hdcp_update_display() and update_config() write aconnector[31]=aconnector, storing an amdgpu_dm_connector * over mutex.owner while the lock is held. amdgpu_dm_update_hdcp() also writes hdcp_content_type[connector-\u003eindex] and content_protection[connector-\u003eindex] on MST. That is an out-of-bounds write into adjacent hdcp_workqueue fields.\nA:H - drm_connector_put() on mutex.owner type-confused as amdgpu_dm_connector, and later lock operations on a mutex whose owner was replaced by a connector pointer, oops or panic the kernel in amdgpu_dm_atomic_commit_tail/HDCP workqueue paths."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:35:03.620Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1c22294c7d9b3b1c26a18ca4eca8c863a5a0d907"
},
{
"url": "https://git.kernel.org/stable/c/decea8279bec5a35413b2cb8e36951cca308fac0"
},
{
"url": "https://git.kernel.org/stable/c/ac490fea9fe74f9d9975c5d8250c8719750589cd"
},
{
"url": "https://git.kernel.org/stable/c/562d24ac214ba9530d88841088eb6adce5c537b5"
},
{
"url": "https://git.kernel.org/stable/c/0fa116a17b69a28712cdf209318e345b676d7f6c"
},
{
"url": "https://git.kernel.org/stable/c/261e0fe4e2c99f687114b64b10b98db964b475f4"
}
],
"title": "drm/amd/display: Resize MST HDCP per-connector arrays to 32",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-90289",
"datePublished": "2026-09-17T16:08:17.368Z",
"dateReserved": "2026-09-11T19:38:34.798Z",
"dateUpdated": "2026-10-30T12:35:03.620Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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