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Syzbot inform\u00f3 una p\u00e9rdida de memoria en el controlador SocketCAN para la herramienta Microchip CAN BUS Analyzer. El problema estaba en usb_coherent no liberado. En mcba_usb_start() se asignan 20 buffers coherentes y no hay nada que los libere: 1) En la funci\u00f3n de devoluci\u00f3n de llamada, la urb se vuelve a enviar y eso es todo 2) En la funci\u00f3n de desconexi\u00f3n, las urbs simplemente se eliminan, pero URB_FREE_BUFFER no est\u00e1 configurado (ver mcba_usb_start) y Esta bandera no se puede utilizar con buffers coherentes. Registro de errores: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: dispositivo desconectado | [ 1367.059384][ T8420] kmemleak: 20 nuevas p\u00e9rdidas de memoria sospechosas (ver /sys/kernel/debug/kmem) Por lo tanto, todos los buffers asignados deben liberarse con usb_free_coherent() expl\u00edcitamente NOTA: Se utiliza el mismo patr\u00f3n para asignar y liberar buffers coherentes en controladores/net/can/usb/kvaser_usb/kvaser_usb_core.c"}], "id": "CVE-2021-47231", "lastModified": "2025-04-04T14:31:28.430", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-05-21T15:15:12.477", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: can: mcba_usb: fix memory leak in mcba_usb", "id": "2282586", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282586"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncan: mcba_usb: fix memory leak in mcba_usb\nSyzbot reported memory leak in SocketCAN driver for Microchip CAN BUS\nAnalyzer Tool. The problem was in unfreed usb_coherent.\nIn mcba_usb_start() 20 coherent buffers are allocated and there is\nnothing, that frees them:\n1) In callback function the urb is resubmitted and that's all\n2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER\nis not set (see mcba_usb_start) and this flag cannot be used with\ncoherent buffers.\nFail log:\n| [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected\n| [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem)\nSo, all allocated buffers should be freed with usb_free_coherent()\nexplicitly\nNOTE:\nThe same pattern for allocating and freeing coherent buffers\nis used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c"], "name": "CVE-2021-47231", "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47231\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47231\nhttps://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47231-c384@gregkh/T"], "threat_severity": "Low"}