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This\nordering can trigger a NULL pointer dereference in the serdev controller's\nreceive_buf handler, as it assumes serdev->ops is valid when\nSERPORT_ACTIVE is set.\n\nThis is similar to the issue fixed in commit 5e700b384ec1\n(\"platform/chrome: cros_ec_uart: properly fix race condition\") where\ndevm_serdev_device_open() was called before fully initializing the\ndevice.\n\nFix the race by ensuring client ops are set before enabling the port via\ndevm_serdev_device_open().\n\nNote, serdev_device_set_baudrate() and serdev_device_set_flow_control()\ncalls should be after the devm_serdev_device_open() call."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: platform/x86: dell-uart-backlight: corregir la condici\u00f3n de ejecuci\u00f3n de serdev La funci\u00f3n dell_uart_bl_serdev_probe() llama a devm_serdev_device_open() antes de configurar las operaciones del cliente a trav\u00e9s de serdev_device_set_client_ops(). Este orden puede desencadenar una desreferencia de puntero NULL en el controlador de recepci\u00f3n de serdev, ya que asume que serdev->ops es v\u00e1lido cuando SERPORT_ACTIVE est\u00e1 configurado. Esto es similar al problema corregido en el commit 5e700b384ec1 (\"platform/chrome: cros_ec_uart: corregir correctamente la condici\u00f3n de ejecuci\u00f3n\") donde se llam\u00f3 a devm_serdev_device_open() antes de inicializar por completo el dispositivo. Corrija la ejecuci\u00f3n asegur\u00e1ndose de que las operaciones del cliente est\u00e9n configuradas antes de habilitar el puerto a trav\u00e9s de devm_serdev_device_open(). Tenga en cuenta que las llamadas serdev_device_set_baudrate() y serdev_device_set_flow_control() deben realizarse despu\u00e9s de la llamada devm_serdev_device_open()."}], "id": "CVE-2025-21695", "lastModified": "2025-10-01T20:18:21.267", "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": "[email protected]", "type": "Primary"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2025-02-12T14:15:32.577", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b2128aa2d45ab20b22548dcf4b48906298ca7fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3a24d923333f75aaece9acb051d676edc0afb75"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "[email protected]", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: platform/x86: dell-uart-backlight: fix serdev race", "id": "2345221", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2345221"}, "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:\nplatform/x86: dell-uart-backlight: fix serdev race\nThe dell_uart_bl_serdev_probe() function calls devm_serdev_device_open()\nbefore setting the client ops via serdev_device_set_client_ops(). This\nordering can trigger a NULL pointer dereference in the serdev controller's\nreceive_buf handler, as it assumes serdev->ops is valid when\nSERPORT_ACTIVE is set.\nThis is similar to the issue fixed in commit 5e700b384ec1\n(\"platform/chrome: cros_ec_uart: properly fix race condition\") where\ndevm_serdev_device_open() was called before fully initializing the\ndevice.\nFix the race by ensuring client ops are set before enabling the port via\ndevm_serdev_device_open().\nNote, serdev_device_set_baudrate() and serdev_device_set_flow_control()\ncalls should be after the devm_serdev_device_open() call."], "name": "CVE-2025-21695", "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"}], "public_date": "2025-02-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21695\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21695\nhttps://lore.kernel.org/linux-cve-announce/2025021259-CVE-2025-21695-ca7d@gregkh/T"], "threat_severity": "Moderate"}