CVE-2024-26914

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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()` \u2192 `dc_validate_global_state()` \u2192 `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 \u2014 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 \u2014 configuring planes and issuing the atomic commit/test \u2014 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 \u2014 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"}}]}}

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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 \u2014 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 \u2014 configuring planes and issuing the atomic commit/test \u2014 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 \u2014 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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "0bd8ef618a42d7e6ea3f701065264e15678025e3", "versionType": "git"}, {"status": "affected", "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c", "lessThan": "39079fe8e660851abbafa90cd55cbf029210661f", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"status": "unaffected", "version": "0", "lessThan": "4.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.7.6", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3"}, {"url": "https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.6", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8", "versionStartIncluding": "4.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:17.004Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26914", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:28:17.004Z", "dateReserved": "2024-02-19T14:20:24.193Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-17T15:59:24.453Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/amd/display: corrige el tama\u00f1o incorrecto de la matriz mpc_combine [por qu\u00e9] MAX_SURFACES es por flujo, mientras que MAX_PLANES es por asic. mpc_combine es una matriz que registra todos los planos por asic. Por lo tanto, se debe utilizar MAX_PLANES como tama\u00f1o de matriz. El uso de MAX_SURFACES provoca el desbordamiento de la matriz cuando hay m\u00e1s de 3 planos. [c\u00f3mo] Utilice MAX_PLANES para el tama\u00f1o de matriz mpc_combine."}], "id": "CVE-2024-26914", "lastModified": "2026-08-04T11:17:20.523", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26914", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:47:53.436948Z", "version": "2.0.3"}}]}, "published": "2024-04-17T16:15:08.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amd/display: fix incorrect mpc_combine array size", "id": "2275792", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275792"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amd/display: fix incorrect mpc_combine array size\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[how]\nUse the MAX_PLANES for the mpc_combine array size."], "name": "CVE-2024-26914", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26914\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26914\nhttps://lore.kernel.org/linux-cve-announce/2024041737-CVE-2024-26914-e47b@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T23:06:02.322488+00:00", "updated": "2025-07-12T23:06:02.322543+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}