CVE-2024-39471

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There is no network or adjacent-network path to this code.\nAC:L - The out-of-bounds index is fully deterministic \u2014 once an interrupt vector with an unmatched SDMA client ID is processed, `-EINVAL` is used as the array index every time, with no race window, no memory-layout guessing, and no state the attacker must wait for. A local user with render-node access can keep the SDMA engines and their trap/error interrupts firing continuously to reach the handler repeatedly.\nPR:L - Exercising SDMA queues and provoking trap interrupts only requires opening the unprivileged DRM render node, which is group-readable to ordinary logged-in users on desktops, Android devices, and GPU cloud/container instances. No CAP_SYS_ADMIN or root in the initial namespace is needed.\nUI:N - The interrupt handler runs asynchronously from GPU activity the attacker's own process generates; no victim must open a file, mount anything, or take any action.\nS:U - The corruption is confined to kernel memory within the same security authority as the host kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `adev->sdma.instance[0xFFFFFFEA]` is an unbounded out-of-bounds read many gigabytes beyond the array, and `amdgpu_fence_process()` then dereferences the resulting `struct amdgpu_ring`, reading `fence_drv.last_seq`, `sync_seq`, `num_fences_mask`, `adev`, and the `fences[]` pointer array from that location \u2014 arbitrary kernel memory read, not a bounded few-byte overread.\nI:H - The wild pointer is not merely read: `amdgpu_fence_process()` performs `atomic_cmpxchg()` on `drv->last_seq`, `timer_delete()` on `fence_drv.fallback_timer`, `RCU_INIT_POINTER(*ptr, NULL)` stores into `drv->fences[]`, and `dma_fence_put()` (a refcount decrement plus potential release callback) on the garbage pointer \u2014 out-of-bounds writes and a refcount-decrement primitive that are the classic building blocks for control-flow hijacking.\nA:H - Dereferencing a pointer several terabytes out of range in hard-interrupt context faults on unmapped kernel memory, producing an oops/panic that cannot be recovered from in IRQ context, and the corrupting writes and bogus `dma_fence_put()` release paths add further crash modes."}]}], "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/amdgpu/sdma_v4_0.c"], "versions": [{"version": "7d0e6329dfdcfe48311f8888d6a8dfa73bee00a9", "lessThan": "5594971e02764aa1c8210ffb838cb4e7897716e8", "status": "affected", "versionType": "git"}, {"version": "7d0e6329dfdcfe48311f8888d6a8dfa73bee00a9", "lessThan": 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sdma_v4_0_irq_id_to_seq return -EINVAL, the process should\nbe stop to avoid out-of-bounds read, so directly return -EINVAL."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/amdgpu: agregue un controlador de error para evitar lecturas fuera de los l\u00edmites si sdma_v4_0_irq_id_to_seq devuelve -EINVAL, el proceso debe detenerse para evitar lecturas fuera de los l\u00edmites, por lo que debe regresar directamente -EINVAL."}], "id": "CVE-2024-39471", "lastModified": "2026-08-04T11:18:57.130", "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": 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{"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/011552f29f20842c9a7a21bffe1f6a2d6457ba46"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0964c84b93db7fbf74f357c1e20957850e092db3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5594971e02764aa1c8210ffb838cb4e7897716e8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b0a3dc3e87821acb80e841b464d335aff242691"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8112fa72b7f139052843ff484130d6f97e9f052f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b2faf1a4f3b6c748c0da36cda865a226534d520"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": 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{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:10701", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.76.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-07-09T00:00:00Z"}], "bugzilla": {"description": "kernel: drm/amdgpu: add error handle to avoid out-of-bounds", "id": "2294313", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294313"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu: add error handle to avoid out-of-bounds\nif the sdma_v4_0_irq_id_to_seq return -EINVAL, the process should\nbe stop to avoid out-of-bounds read, so directly return -EINVAL."], "name": "CVE-2024-39471", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-39471\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-39471\nhttps://lore.kernel.org/linux-cve-announce/2024062501-CVE-2024-39471-3dee@gregkh/T"], "threat_severity": "Moderate"}

{}