{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26914", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.193Z", "datePublished": "2024-04-17T15:59:24.453Z", "dateUpdated": "2026-08-05T11:28:17.004Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:17.004Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: fix incorrect mpc_combine array size\n\n[why]\nMAX_SURFACES is per stream, while MAX_PLANES is per asic. The\nmpc_combine is an array that records all the planes per asic. Therefore\nMAX_PLANES should be used as the array size. Using MAX_SURFACES causes\narray overflow when there are more than 3 planes.\n\n[how]\nUse the MAX_PLANES for the mpc_combine array 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 - The overflow is reached only through the local DRM atomic modeset ioctl (`DRM_IOCTL_MODE_ATOMIC`) on /dev/dri/cardN, which drives `amdgpu_dm_atomic_check()` → `dc_validate_global_state()` → `dcn32_internal_validate_bw()`. No network or remote data path reaches `dcn32_fpu.c`.\nAC:L - On an affected DCN3.2/3.2.1 ASIC the attacker fully controls the trigger — assigning four planes (two primaries plus two MPO overlays) across two CRTCs in a single atomic commit, even a TEST_ONLY one, deterministically pushes `mpc_combine_count` past the 3-entry array. No race, no timing window, no unpredictable memory layout is required.\nPR:L - The atomic ioctl requires DRM master, which an ordinary unprivileged user holds for their own graphical session (or obtains by opening the card first on a kiosk/embedded/automotive system with no running compositor); no root or capability in the init namespace is needed.\nUI:N - The attacker performs the entire sequence — configuring planes and issuing the atomic commit/test — from their own process; no other user must open a file, plug in hardware, or take any action.\nS:U - The corruption occurs in the kernel stack frame of the amdgpu display driver and stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Clobbering `mpc_combine_count` with the low bits of a kernel pointer makes `update_pipes_with_slice_table()` and `update_slice_table_for_plane()` read hundreds of megabytes worth of out-of-bounds indices off the kernel stack and treat that data as `dc_plane_state`/`pipe_ctx` pointers, giving an out-of-bounds read primitive over kernel memory; per kernel CVSS guidance, memory corruption of this class is scored High.\nI:H - This is an out-of-bounds stack write: kernel pointer values are written past the end of `struct pipe_slice_table`, and the corrupted count subsequently allows an append at an attacker-uninfluenced-but-huge index, producing a wild write plus `slice_count += diff` increments at out-of-bounds addresses — an exploitable memory-corruption primitive.\nA:H - Once the count is corrupted into a multi-million value, the driver dereferences garbage pointers inside a `DC_FP_START()`/kernel_fpu section while holding the DC lock, which reliably produces an oops/panic and takes down the display pipeline." } ] } ], "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/dml/dcn32/dcn32_fpu.c" ], "versions": [ { "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "0bd8ef618a42d7e6ea3f701065264e15678025e3", "status": "affected", "versionType": "git" }, { "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "39079fe8e660851abbafa90cd55cbf029210661f", "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/dml/dcn32/dcn32_fpu.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.6", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "6.7.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3" }, { "url": "https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f" } ], "title": "drm/amd/display: fix incorrect mpc_combine array size", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:21:05.456Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26914", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:47:53.436948Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:32:51.667Z" } } ] } }