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If an interrupt has already occurred then waiting for\nthe interrupt handler to complete will deadlock because it will be trying\nto acquire the same mutex.\n\nCPU0                           CPU1\n----                           ----\nmcp251x_open()\n mutex_lock(&priv->mcp_lock)\n  request_threaded_irq()\n                               <interrupt>\n                               mcp251x_can_ist()\n                                mutex_lock(&priv->mcp_lock)\n  mcp251x_hw_wake()\n   disable_irq() <-- deadlock\n\nUse disable_irq_nosync() instead because the interrupt handler does\neverything while holding the mutex so it doesn't matter if it's still\nrunning."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: mcp251x: soluciona el bloqueo si se produce una interrupci\u00f3n durante mcp251x_open La funci\u00f3n mcp251x_hw_wake() se llama con el mutex mpc_lock retenido y desactiva el controlador de interrupciones para que no se puedan procesar interrupciones mientras se activa el dispositivo. Si ya se produjo una interrupci\u00f3n, esperar a que se complete el controlador de interrupciones provocar\u00e1 un bloqueo porque intentar\u00e1 adquirir el mismo mutex. CPU0 CPU1 ---- ---- mcp251x_open() mutex_lock(&amp;priv-&gt;mcp_lock) request_threaded_irq()  mcp251x_can_ist() mutex_lock(&amp;priv-&gt;mcp_lock) mcp251x_hw_wake() deshabilitar_irq() &lt;-- bloqueo Utilice deshabilitar_irq_nosync() en su lugar porque el controlador de interrupciones hace todo mientras mantiene el mutex, por lo que no importa si todav\u00eda se est\u00e1 ejecutando."}], "id": "CVE-2024-46791", "lastModified": "2024-09-20T18:21:19.457", "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": "2024-09-18T08:15:06.067", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a49b6b1caf5cefc05264d29079d52c99cb188e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/513c8fc189b52f7922e36bdca58997482b198f0e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7dd9c26bd6cf679bcfdef01a8659791aa6487a29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e554113a1cd2a9cfc6c7af7bdea2141c5757e188"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open", "id": "2313139", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2313139"}, "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-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncan: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open\nThe mcp251x_hw_wake() function is called with the mpc_lock mutex held and\ndisables the interrupt handler so that no interrupts can be processed while\nwaking the device. If an interrupt has already occurred then waiting for\nthe interrupt handler to complete will deadlock because it will be trying\nto acquire the same mutex.\nCPU0                           CPU1\n----                           ----\nmcp251x_open()\nmutex_lock(&priv->mcp_lock)\nrequest_threaded_irq()\n<interrupt>\nmcp251x_can_ist()\nmutex_lock(&priv->mcp_lock)\nmcp251x_hw_wake()\ndisable_irq() <-- deadlock\nUse disable_irq_nosync() instead because the interrupt handler does\neverything while holding the mutex so it doesn't matter if it's still\nrunning."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-46791", "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46791\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46791\nhttps://lore.kernel.org/linux-cve-announce/2024091853-CVE-2024-46791-af66@gregkh/T"], "statement": "Following issue marked as moderate with \"not affected or will not fix\" for Red Hat Enterprise Linux, as it is not vulnerable to this CVE. This is because the CVE does not impact the versions or configurations of the Linux kernel used in Red Hat's distributions.", "threat_severity": "Moderate"}