{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90289", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.798Z", "datePublished": "2026-09-17T16:08:17.368Z", "dateUpdated": "2026-10-21T12:50:48.804Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:50:48.804Z" }, "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's used is like MAX_DISPLAY_COUNT.\nHence we're 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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - hdcp_update_display() and update_config() index hdcp_workqueue.aconnector[] with aconnector->base.index from drm_connector_init_only()'s ida_alloc_max(..., 31). The path is DRM_IOCTL_MODE_ATOMIC → drm_mode_atomic_ioctl → amdgpu_dm_atomic_commit_tail → 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->aconnector[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's 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->mutex 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(&...->base) 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->index] and content_protection[connector->index] 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c", "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h" ], "versions": [ { "version": "82986fd631fa04bcedaefe11a6b3767601cbe84f", "lessThan": "decea8279bec5a35413b2cb8e36951cca308fac0", "status": "affected", "versionType": "git" }, { "version": "82986fd631fa04bcedaefe11a6b3767601cbe84f", "lessThan": "ac490fea9fe74f9d9975c5d8250c8719750589cd", "status": "affected", "versionType": "git" }, { "version": "82986fd631fa04bcedaefe11a6b3767601cbe84f", "lessThan": "562d24ac214ba9530d88841088eb6adce5c537b5", "status": "affected", "versionType": "git" }, { "version": "82986fd631fa04bcedaefe11a6b3767601cbe84f", "lessThan": "0fa116a17b69a28712cdf209318e345b676d7f6c", "status": "affected", "versionType": "git" }, { "version": "82986fd631fa04bcedaefe11a6b3767601cbe84f", "lessThan": "261e0fe4e2c99f687114b64b10b98db964b475f4", "status": "affected", "versionType": "git" }, { "version": "99c444d3c3c43db354b253d9bfac081073dcb484", "status": "affected", "versionType": "git" }, { "version": "d90f97cb3821c47bdf773dcf6cade143773ec764", "status": "affected", "versionType": "git" }, { "version": "5.15.128", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "6.1.47", "lessThan": "6.2", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c", "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.47" } ] } ] } ], "references": [ { "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" } } } }