CVE-2024-56538

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An attacker merely holds an fd open and loops ioctls, and the freed DMA channels, unmapped iomem, and destroyed mutex are hit reliably.\nPR:L - The attacker only needs an open file descriptor on the DRM primary node, which unprivileged local users of a graphical session obtain via logind ACLs or video-group membership on these embedded/kiosk systems. The reachable dumb-buffer ioctls carry flags 0, requiring neither DRM master nor DRM_AUTH.\nUI:N - The attacker's process simply keeps its fd open and polls; no victim action is needed at exploitation time. On ZynqMP FPGA MPSoCs the driver teardown occurs through routine platform events such as FPGA-region/device-tree-overlay reconfiguration and module reload rather than a deliberate victim action.\nS:U - The corruption is confined to kernel memory within the same security authority as the kernel itself. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The missing unmap_mapping_range() leaves userspace with live mappings of GEM DMA buffers whose backing reserved-memory pool was released by of_reserved_mem_device_release(), giving a direct read primitive into kernel memory that can be recycled for other allocations. The use-after-free on released DMA channels and driver state further enables disclosure of freed kernel object contents.\nI:H - Those same stale userspace mappings are writable, yielding a direct write-after-free into memory the kernel will reallocate, and the driver continues submitting DMA descriptors on channels already handed back via dma_release_channel(). This combination provides heap-grooming and control-flow-hijack primitives typical of an exploitable use-after-free.\nA:H - Post-removal ioctls write to devres-unmapped iomem with the APB clock gated and lock a mutex_destroy()'d dp->lock, producing an oops or an AXI bus hang that wedges the SoC. 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On ZynqMP FPGA MPSoCs the driver teardown occurs through routine platform events such as FPGA-region/device-tree-overlay reconfiguration and module reload rather than a deliberate victim action.\nS:U - The corruption is confined to kernel memory within the same security authority as the kernel itself. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The missing unmap_mapping_range() leaves userspace with live mappings of GEM DMA buffers whose backing reserved-memory pool was released by of_reserved_mem_device_release(), giving a direct read primitive into kernel memory that can be recycled for other allocations. The use-after-free on released DMA channels and driver state further enables disclosure of freed kernel object contents.\nI:H - Those same stale userspace mappings are writable, yielding a direct write-after-free into memory the kernel will reallocate, and the driver continues submitting DMA descriptors on channels already handed back via dma_release_channel(). This combination provides heap-grooming and control-flow-hijack primitives typical of an exploitable use-after-free.\nA:H - Post-removal ioctls write to devres-unmapped iomem with the APB clock gated and lock a mutex_destroy()'d dp->lock, producing an oops or an AXI bus hang that wedges the SoC. 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This\ncauses any further userspace accesses to result in an error without\nfurther calls into this driver's internals."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm: zynqmp_kms: Desconectar el dispositivo DRM antes de quitarlo. Evite que los accesos al espacio de usuario del dispositivo DRM provoquen use-after-frees desconectando el dispositivo antes de quitarlo. Esto hace que cualquier otro acceso al espacio de usuario genere un error sin m\u00e1s llamadas a los componentes internos de este controlador."}], "id": "CVE-2024-56538", "lastModified": "2026-10-30T13:17:46.463", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56538", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-02-11T15:42:57.597278Z", "version": "2.0.3"}}]}, "published": "2024-12-27T14:15:33.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c8ca1da81e5a9787284eb84c0c6ae927f063c15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e07c88914fc5289c21820b1aa94f058feb38197"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4fb97432e28a7e136b2d76135d50e988ada8e1af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/692f52aedccbf79b212a1e14e3735192b4c24a7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a17b9afe58c474657449cf87e238b1788200576b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: drm: zynqmp_kms: Unplug DRM device before removal", "id": "2334508", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334508"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm: zynqmp_kms: Unplug DRM device before removal\nPrevent userspace accesses to the DRM device from causing\nuse-after-frees by unplugging the device before we remove it. This\ncauses any further userspace accesses to result in an error without\nfurther calls into this driver's internals."], "name": "CVE-2024-56538", "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": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56538\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56538\nhttps://lore.kernel.org/linux-cve-announce/2024122726-CVE-2024-56538-379d@gregkh/T"], "threat_severity": "Important"}

{}