{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-21985", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.799Z", "datePublished": "2025-04-01T15:47:12.103Z", "dateUpdated": "2026-08-05T11:55:51.832Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:55:51.832Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix out-of-bound accesses\n\n[WHAT & HOW]\nhpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4),\nbut location can have size up to 6. As a result, it is necessary to\ncheck location against MAX_HPO_DP2_ENCODERS.\n\nSimiliarly, disp_cfg_stream_location can be used as an array index which\nshould be 0..5, so the ASSERT's conditions should be less without equal." } ], "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 - The vulnerable code is reached only through the local DRM atomic modeset ioctl (`DRM_IOCTL_MODE_ATOMIC`) on /dev/dri/card*, via amdgpu_dm_atomic_check() → dc_validate_global_state() → dml2_validate(); no network or remote peer data is involved.\nAC:L - Once a DisplayPort configuration with five or more streams/planes exists (multi-monitor or MST/dock setups, SubVP phantom streams, or primaries plus an MPO overlay), the out-of-bounds index is hit deterministically on every validation pass, and the attacker can re-issue TEST_ONLY atomic commits repeatedly with plane/stream assignments of their choosing.\nPR:L - The atomic ioctl is registered with DRM_MASTER only, which an ordinary unprivileged user holds for their active graphical session on the amdgpu card node — no root, no capability, and no init-namespace privilege is required.\nUI:N - The attacker performs the atomic commit themselves from their own session; no action by any other user is needed to trigger the out-of-bounds access.\nS:U - The corruption is confined to kernel heap memory belonging to the amdgpu display driver within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The read at hpo_stream_to_link_encoder_mapping[4..5] pulls kernel data from beyond the array into adjacent struct state (g6_temp_read_watermark_set), and the resulting out-of-bounds heap write is a corruption primitive that can be leveraged to shape adjacent kernel objects for disclosure.\nI:H - The out-of-bounds value is used directly as an index into the 8-entry OutputEncoder[] array, producing a 4-byte write at a large, configuration-influenced offset that lands outside the kzalloc'd struct dml2_context, corrupting neighbouring heap objects as well as the DML output configuration that drives display hardware programming.\nA:H - The wild write corrupts kernel heap memory and the display-config state used for bandwidth/watermark programming, leading to oops, slab corruption, or hung/underflowing display output requiring recovery." } ] } ], "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/dc/dml2/dml21/dml21_translation_helper.c", "drivers/gpu/drm/amd/display/dc/dml2/dml2_translation_helper.c" ], "versions": [ { "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "36793d90d76f667d26c6dd025571481ee0c96abc", "status": "affected", "versionType": "git" }, { "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "9aedc776b11038f04f4641241bb7e877781e4aa4", "status": "affected", "versionType": "git" }, { "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "8adbb2a98b00926315fd513b5fe2596b5716b82d", "status": "affected", "versionType": "git" } ] }, { "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/dc/dml2/dml21/dml21_translation_helper.c", "drivers/gpu/drm/amd/display/dc/dml2/dml2_translation_helper.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.20", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.8", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14", "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": "4.15", "versionEndExcluding": "6.12.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.13.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.14" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/36793d90d76f667d26c6dd025571481ee0c96abc" }, { "url": "https://git.kernel.org/stable/c/9aedc776b11038f04f4641241bb7e877781e4aa4" }, { "url": "https://git.kernel.org/stable/c/8adbb2a98b00926315fd513b5fe2596b5716b82d" } ], "title": "drm/amd/display: Fix out-of-bound accesses", "x_generator": { "engine": "bippy-1.2.0" } } } }