CVE-2025-39921

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Unfortunately, op->max_freq is not valid\nwhen this function is called during probe but is instead zero.\nAccordingly, baud_rate_val is calculated to be INT_MAX due to division\nby zero, causing probe of the attached memory device to fail.\n\nSeemingly spi-microchip-core-qspi was the only driver that had such a\nmodification made to its supports_op callback when the per_op_freq\ncapability was added, so just remove it to restore prior functionality."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nspi: microchip-core-qspi: dejar de comprobar la viabilidad de op->max_freq en la funci\u00f3n de callback supports_op\n\nEn el commit 13529647743d9 ('spi: microchip-core-qspi: Soporte para conmutadores de frecuencia de operaci\u00f3n por spi-mem'), la l\u00f3gica para comprobar la viabilidad de op->max_freq en mchp_coreqspi_setup_clock() fue copiada a mchp_coreqspi_supports_op(). Desafortunadamente, op->max_freq no es v\u00e1lido cuando esta funci\u00f3n es llamada durante la fase de 'probe', sino que es cero. En consecuencia, baud_rate_val se calcula como INT_MAX debido a una divisi\u00f3n por cero, lo que provoca que la detecci\u00f3n ('probe') del dispositivo de memoria adjunto falle.\n\nAparentemente, spi-microchip-core-qspi fue el \u00fanico controlador al que se le hizo tal modificaci\u00f3n en su callback supports_op cuando se a\u00f1adi\u00f3 la capacidad per_op_freq, as\u00ed que simplemente se elimina para restaurar la funcionalidad anterior."}], "id": "CVE-2025-39921", "lastModified": "2026-10-21T13:18:16.753", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39921", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T17:43:20.240186Z", "version": "2.0.3"}}]}, "published": "2025-10-01T08:15:35.370", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ad071e3d57967f7ab483aed0687468bc1d9e9ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89e7353f522f5cf70cb48c01ce2dcdcb275b8022"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac8a13f35d5b8996582b3f97b924838a5c570c18"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback", "id": "2400633", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400633"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nspi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback\nIn commit 13529647743d9 (\"spi: microchip-core-qspi: Support per spi-mem\noperation frequency switches\") the logic for checking the viability of\nop->max_freq in mchp_coreqspi_setup_clock() was copied into\nmchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid\nwhen this function is called during probe but is instead zero.\nAccordingly, baud_rate_val is calculated to be INT_MAX due to division\nby zero, causing probe of the attached memory device to fail.\nSeemingly spi-microchip-core-qspi was the only driver that had such a\nmodification made to its supports_op callback when the per_op_freq\ncapability was added, so just remove it to restore prior functionality."], "name": "CVE-2025-39921", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39921\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39921\nhttps://lore.kernel.org/linux-cve-announce/2025100120-CVE-2025-39921-820c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-02T08:40:10.005116+00:00", "updated": "2025-10-02T08:40:10.005174+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}