CVE-2024-46851

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The pipe\ncontext passed to dcn10_set_drr() is a member of this resource context.\n\nIf dc_state_destruct() is called parallel to the IRQ processing (which\ncalls dcn10_set_drr() at some point), we can end up using already nulled\nfunction callback fields of struct stream_resource.\n\nThe logic in dcn10_set_drr() already tries to avoid this, by checking tg\nagainst NULL. But if the nulling happens exactly after the NULL check and\nbefore the next access, then we get a race.\n\nAvoid this by copying tg first to a local variable, and then use this\nvariable for all the operations. This should work, as long as nobody\nfrees the resource pool where the timing generators live.\n\n(cherry picked from commit a3cc326a43bdc48fbdf53443e1027a03e309b643)"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: Evitar la ejecuci\u00f3n entre dcn10_set_drr() y dc_state_destruct() dc_state_destruct() anula el contexto de recurso del estado del DC. El contexto de tuber\u00eda pasado a dcn10_set_drr() es un miembro de este contexto de recurso. Si se llama a dc_state_destruct() en paralelo al procesamiento de IRQ (que llama a dcn10_set_drr() en alg\u00fan momento), podemos terminar usando campos de devoluci\u00f3n de llamada de funci\u00f3n ya anulados de struct stream_resource. La l\u00f3gica en dcn10_set_drr() ya intenta evitar esto, al comprobar tg contra NULL. Pero si la anulaci\u00f3n ocurre exactamente despu\u00e9s de la comprobaci\u00f3n de NULL y antes del siguiente acceso, entonces obtenemos una ejecuci\u00f3n. Evite esto copiando tg primero a una variable local y luego use esta variable para todas las operaciones. Esto deber\u00eda funcionar, siempre y cuando nadie libere el grupo de recursos donde se encuentran los generadores de tiempo. (seleccionado de el commit a3cc326a43bdc48fbdf53443e1027a03e309b643)"}], "id": "CVE-2024-46851", "lastModified": "2026-06-17T07:56:04.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-46851", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T13:58:30.543165Z", "version": "2.0.3"}}]}, "published": "2024-09-27T13:15:16.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7aeb03888b92304e2fc7d4d1c242f54a312561b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b6ce047a81f508f5c60756db8dfb5ff486e4dad0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amd/display: Avoid race between dcn10_set_drr() and dc_state_destruct()", "id": "2315203", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2315203"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/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:\ndrm/amd/display: Avoid race between dcn10_set_drr() and dc_state_destruct()\ndc_state_destruct() nulls the resource context of the DC state. The pipe\ncontext passed to dcn10_set_drr() is a member of this resource context.\nIf dc_state_destruct() is called parallel to the IRQ processing (which\ncalls dcn10_set_drr() at some point), we can end up using already nulled\nfunction callback fields of struct stream_resource.\nThe logic in dcn10_set_drr() already tries to avoid this, by checking tg\nagainst NULL. But if the nulling happens exactly after the NULL check and\nbefore the next access, then we get a race.\nAvoid this by copying tg first to a local variable, and then use this\nvariable for all the operations. This should work, as long as nobody\nfrees the resource pool where the timing generators live.\n(cherry picked from commit a3cc326a43bdc48fbdf53443e1027a03e309b643)"], "name": "CVE-2024-46851", "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": "2024-09-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46851\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46851\nhttps://lore.kernel.org/linux-cve-announce/2024092742-CVE-2024-46851-125b@gregkh/T"], "threat_severity": "Moderate"}

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