CVE-2026-43401

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As a result,\nany call to update_qos_requests() will result in a NULL pointer\ndereference as the code will attempt to access pstate.turbo_freq using\nthe NULL cpudata pointer.\n\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\nafter initializing the 'freq' variable, so it is better to defer the\n'freq' until intel_pstate_get_hwp_cap() has been called.\n\nFix this by deferring the 'freq' assignment until after the policy and\ndriver_data have been validated.\n\n[ rjw: Added one paragraph to the changelog ]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncpufreq: intel_pstate: Correcci\u00f3n de desreferencia de puntero NULL en update_cpu_qos_request()\n\nLa funci\u00f3n update_cpu_qos_request() intenta inicializar la variable \u2019freq\u2019 desreferenciando \u2019cpudata\u2019 antes de verificar si la \u2019policy\u2019 es v\u00e1lida.\n\nEste problema ocurre en sistemas arrancados con el par\u00e1metro \u201cnosmt\u201d, donde all_cpu_data[cpu] es NULL para los hilos hermanos SMT. Como resultado, cualquier llamada a update_qos_requests() resultar\u00e1 en una desreferencia de puntero NULL, ya que el c\u00f3digo intentar\u00e1 acceder a pstate.turbo_freq usando el puntero cpudata NULL.\n\nAdem\u00e1s, pstate.turbo_freq puede ser actualizado por intel_pstate_get_hwp_cap() despu\u00e9s de inicializar la variable \u2019freq\u2019, por lo que es mejor aplazar la \u2019freq\u2019 hasta que intel_pstate_get_hwp_cap() haya sido llamada.\n\nSolucione esto aplazando la asignaci\u00f3n de \u2019freq\u2019 hasta despu\u00e9s de que la policy y driver_data hayan sido validados.\n\n[ rjw: Se a\u00f1adi\u00f3 un p\u00e1rrafo al registro de cambios ]"}], "id": "CVE-2026-43401", "lastModified": "2026-11-11T20:10:00.273", "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-2026-43401", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:37:22.098518Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:51.543", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()", "id": "2468179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468179"}, "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": ["A flaw was found in the Linux kernel's `intel_pstate` component. This vulnerability arises when the system is booted with the \"nosmt\" parameter, causing a critical error known as a null pointer dereference in the `update_cpu_qos_request()` function. Such an error can lead to system instability and potentially a kernel crash, effectively causing a denial of service (DoS) for the affected system."], "name": "CVE-2026-43401", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43401\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43401\nhttps://lore.kernel.org/linux-cve-announce/2026050840-CVE-2026-43401-c331@gregkh/T"], "threat_severity": "Moderate"}

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