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La plataforma vfio SET_IRQS ioctl actualmente permite la activaci\u00f3n de bucle invertido de una interrupci\u00f3n antes de que el usuario haya configurado un evento de se\u00f1alizaci\u00f3n, lo que permite un puntero NULL. desreferencia. En lugar de registrar la IRQ relativa a un activador v\u00e1lido, registre todas las IRQ en estado deshabilitado en la ruta abierta del dispositivo. Esto permite que las operaciones de m\u00e1scara en la IRQ se aniden dentro del estado de habilitaci\u00f3n general gobernado por una se\u00f1al eventfd v\u00e1lida. Esto desacopla a @masked, protegido por el spinlock @locked de @trigger, protegido a trav\u00e9s del mutex @igate. Al hacerlo, se garantiza que los cambios en @trigger no puedan competir con los controladores IRQ porque el controlador IRQ se desactiva sincr\u00f3nicamente antes de modificar el disparador, y la activaci\u00f3n en bucle invertido de la IRQ a trav\u00e9s de ioctl es segura debido a la serializaci\u00f3n con cambios en el disparador a trav\u00e9s de igate. Por compatibilidad, las fallas de request_irq() se mantienen locales para el ioctl SET_IRQS en lugar de un error fatal en la ruta abierta del dispositivo. Esto permite, por ejemplo, que un controlador de espacio de usuario compatible con el modo de sondeo contin\u00fae funcionando independientemente de mover el sitio de llamada request_irq(). Esto necesariamente bloquea todo el acceso SET_IRQS al \u00edndice fallido."}], "id": "CVE-2024-26813", "lastModified": "2024-12-20T14:30:24.357", "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"}]}, "published": "2024-04-05T09:15:09.340", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07afdfd8a68f9eea8db0ddc4626c874f29d2ac5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09452c8fcbd7817c06e8e3212d99b45917e603a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0f8d8f9c2173a541812dd750529f4a415117eb29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/62d4e43a569b67929eb3319780be5359694c8086"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/675daf435e9f8e5a5eab140a9864dfad6668b375"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7932db06c82c5b2f42a4d1a849d97dba9ce4a362"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc5838f19d39a5fef04c468199699d2a4578be3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6bedd6acc0bcb1e7e010bc046032e47f08d379f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07afdfd8a68f9eea8db0ddc4626c874f29d2ac5e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09452c8fcbd7817c06e8e3212d99b45917e603a5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0f8d8f9c2173a541812dd750529f4a415117eb29"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/62d4e43a569b67929eb3319780be5359694c8086"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/675daf435e9f8e5a5eab140a9864dfad6668b375"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7932db06c82c5b2f42a4d1a849d97dba9ce4a362"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc5838f19d39a5fef04c468199699d2a4578be3a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6bedd6acc0bcb1e7e010bc046032e47f08d379f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: vfio/platform: Create persistent IRQ handlers", "id": "2273648", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273648"}, "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": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvfio/platform: Create persistent IRQ handlers\nThe vfio-platform SET_IRQS ioctl currently allows loopback triggering of\nan interrupt before a signaling eventfd has been configured by the user,\nwhich thereby allows a NULL pointer dereference.\nRather than register the IRQ relative to a valid trigger, register all\nIRQs in a disabled state in the device open path. This allows mask\noperations on the IRQ to nest within the overall enable state governed\nby a valid eventfd signal. This decouples @masked, protected by the\n@locked spinlock from @trigger, protected via the @igate mutex.\nIn doing so, it's guaranteed that changes to @trigger cannot race the\nIRQ handlers because the IRQ handler is synchronously disabled before\nmodifying the trigger, and loopback triggering of the IRQ via ioctl is\nsafe due to serialization with trigger changes via igate.\nFor compatibility, request_irq() failures are maintained to be local to\nthe SET_IRQS ioctl rather than a fatal error in the open device path.\nThis allows, for example, a userspace driver with polling mode support\nto continue to work regardless of moving the request_irq() call site.\nThis necessarily blocks all SET_IRQS access to the failed index."], "name": "CVE-2024-26813", "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": "2024-04-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26813\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26813\nhttps://lore.kernel.org/linux-cve-announce/2024040551-CVE-2024-26813-b9e8@gregkh/T"], "statement": "No Red Hat Products are affected by this vulnerability.", "threat_severity": "Low"}

{}