CVE-2024-46698

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This leads to the\nfollowing problem when the pimary device is not VGA compatible:\n\n1. A PCI device with a non-VGA class is the boot display\n2. That device is probed first and it is not a VGA device so\n sysfb_disable() is not called, but the device resources\n are freed by aperture_detach_platform_device()\n3. Non-primary GPU has a VGA class and it ends up calling sysfb_disable()\n4. NULL pointer dereference via sysfb_disable() since the resources\n have already been freed by aperture_detach_platform_device() when\n it was called by the other device.\n\nFix this by passing a device pointer to sysfb_disable() and checking\nthe device to determine if we should execute it or not.\n\nv2: Fix build when CONFIG_SCREEN_INFO is not set\nv3: Move device check into the mutex\n Drop primary variable in aperture_remove_conflicting_pci_devices()\n Drop __init on pci sysfb_pci_dev_is_enabled()"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video/aperture: opcionalmente hacer coincidir el dispositivo en sysfb_disable() En aperture_remove_conflicting_pci_devices(), actualmente solo llamamos a sysfb_disable() en dispositivos de clase vga. Esto lleva al siguiente problema cuando el dispositivo principal no es compatible con VGA: 1. Un dispositivo PCI con una clase que no es VGA es la pantalla de arranque 2. Ese dispositivo se sondea primero y no es un dispositivo VGA, por lo que no se llama a sysfb_disable(), pero los recursos del dispositivo se liberan mediante aperture_detach_platform_device() 3. La GPU no principal tiene una clase VGA y termina llamando a sysfb_disable() 4. Desreferencia de puntero NULL a trav\u00e9s de sysfb_disable() ya que los recursos ya se han liberado mediante aperture_detach_platform_device() cuando fue llamado por el otro dispositivo. Solucione esto pasando un puntero de dispositivo a sysfb_disable() y verificando el dispositivo para determinar si debemos ejecutarlo o no. v2: Arreglar la compilaci\u00f3n cuando CONFIG_SCREEN_INFO no est\u00e1 configurado v3: Mover la verificaci\u00f3n del dispositivo al mutex Eliminar la variable principal en aperture_remove_conflicting_pci_devices() Eliminar __init en pci sysfb_pci_dev_is_enabled()"}], "id": "CVE-2024-46698", "lastModified": "2026-06-17T07:55:45.233", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-46698", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T15:04:59.820597Z", "version": "2.0.3"}}]}, "published": "2024-09-13T06:15:14.563", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17e78f43de0c6da34204cc858b4cc05671ea9acf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b49420d6a1aeb399e5b107fc6eb8584d0860fbd7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: video/aperture: optionally match the device in sysfb_disable()", "id": "2312086", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2312086"}, "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"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvideo/aperture: optionally match the device in sysfb_disable()\nIn aperture_remove_conflicting_pci_devices(), we currently only\ncall sysfb_disable() on vga class devices. This leads to the\nfollowing problem when the pimary device is not VGA compatible:\n1. A PCI device with a non-VGA class is the boot display\n2. That device is probed first and it is not a VGA device so\nsysfb_disable() is not called, but the device resources\nare freed by aperture_detach_platform_device()\n3. Non-primary GPU has a VGA class and it ends up calling sysfb_disable()\n4. NULL pointer dereference via sysfb_disable() since the resources\nhave already been freed by aperture_detach_platform_device() when\nit was called by the other device.\nFix this by passing a device pointer to sysfb_disable() and checking\nthe device to determine if we should execute it or not.\nv2: Fix build when CONFIG_SCREEN_INFO is not set\nv3: Move device check into the mutex\nDrop primary variable in aperture_remove_conflicting_pci_devices()\nDrop __init on pci sysfb_pci_dev_is_enabled()"], "name": "CVE-2024-46698", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46698\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46698\nhttps://lore.kernel.org/linux-cve-announce/2024091341-CVE-2024-46698-357c@gregkh/T"], "threat_severity": "Low"}

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