CVE-2021-47583

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The problem was in wrong mutex_init() location.\n\nPrevious mutex_init(&state->msg_lock) call was in ->init() function, but\ndvb_usbv2_init() has this order of calls:\n\n\tdvb_usbv2_init()\n\t dvb_usbv2_adapter_init()\n\t dvb_usbv2_adapter_frontend_init()\n\t props->frontend_attach()\n\n\t props->init()\n\nSince mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach()\ninternally we need to initialize state->msg_lock before\nfrontend_attach(). 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The problem was in wrong mutex_init() location.\n\nPrevious mutex_init(&state->msg_lock) call was in ->init() function, but\ndvb_usbv2_init() has this order of calls:\n\n\tdvb_usbv2_init()\n\t dvb_usbv2_adapter_init()\n\t dvb_usbv2_adapter_frontend_init()\n\t props->frontend_attach()\n\n\t props->init()\n\nSince mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach()\ninternally we need to initialize state->msg_lock before\nfrontend_attach(). 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/media/usb/dvb-usb-v2/mxl111sf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4b2d9600b31f9ba7adbc9f3c54a068615d27b390", "status": "affected", "version": "8572211842afc53c8450fb470f2b8d02ba7592e0", "versionType": "git"}, {"lessThan": "96f182c9f48b984447741f054ec301fdc8517035", "status": "affected", "version": "8572211842afc53c8450fb470f2b8d02ba7592e0", "versionType": "git"}, {"lessThan": "b99bdf127af91d53919e96292c05f737c45ea59a", "status": "affected", "version": "8572211842afc53c8450fb470f2b8d02ba7592e0", "versionType": "git"}, {"lessThan": "8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba", "status": "affected", "version": "8572211842afc53c8450fb470f2b8d02ba7592e0", "versionType": "git"}, {"lessThan": "44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f", "status": "affected", "version": "8572211842afc53c8450fb470f2b8d02ba7592e0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/media/usb/dvb-usb-v2/mxl111sf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.7"}, {"lessThan": "3.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.222", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.168", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.88", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3F295854-641E-4409-AA77-B11F9057CC4E", "versionEndExcluding": "4.19.222", "versionStartIncluding": "3.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "195EBAA1-4CCE-4898-9351-F4A0DBCAA022", "versionEndExcluding": "5.4.168", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A657B2D0-5B9D-42BE-A3BF-228DBC1B057C", "versionEndExcluding": "5.10.88", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "11274E95-438A-449A-B100-01B2B0046669", "versionEndExcluding": "5.15.11", "versionStartIncluding": "5.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mxl111sf: change mutex_init() location\n\nSyzbot reported, that mxl111sf_ctrl_msg() uses uninitialized\nmutex. The problem was in wrong mutex_init() location.\n\nPrevious mutex_init(&state->msg_lock) call was in ->init() function, but\ndvb_usbv2_init() has this order of calls:\n\n\tdvb_usbv2_init()\n\t dvb_usbv2_adapter_init()\n\t dvb_usbv2_adapter_frontend_init()\n\t props->frontend_attach()\n\n\t props->init()\n\nSince mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach()\ninternally we need to initialize state->msg_lock before\nfrontend_attach(). To achieve it, ->probe() call added to all mxl111sf_*\ndevices, which will simply initiaize mutex."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: medio: mxl111sf: cambiar la ubicaci\u00f3n de mutex_init() Syzbot inform\u00f3 que mxl111sf_ctrl_msg() usa un mutex no inicializado. El problema estaba en la ubicaci\u00f3n mutex_init() incorrecta. La llamada anterior a mutex_init(&state->msg_lock) estaba en la funci\u00f3n ->init(), pero dvb_usbv2_init() tiene este orden de llamadas: dvb_usbv2_init() dvb_usbv2_adapter_init() dvb_usbv2_adapter_frontend_init() props->frontend_attach() props->init() Desde Los dispositivos mxl111sf_* llaman a mxl111sf_ctrl_msg() en ->frontend_attach() internamente, necesitamos inicializar state->msg_lock antes de frontend_attach(). Para lograrlo, se agrega la llamada ->probe() a todos los dispositivos mxl111sf_*, lo que simplemente iniciar\u00e1 el mutex."}], "id": "CVE-2021-47583", "lastModified": "2026-06-17T04:17:48.747", "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-2021-47583", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-24T18:10:30.676527Z", "version": "2.0.3"}}]}, "published": "2024-06-19T15:15:52.843", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b2d9600b31f9ba7adbc9f3c54a068615d27b390"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96f182c9f48b984447741f054ec301fdc8517035"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b99bdf127af91d53919e96292c05f737c45ea59a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b2d9600b31f9ba7adbc9f3c54a068615d27b390"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96f182c9f48b984447741f054ec301fdc8517035"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b99bdf127af91d53919e96292c05f737c45ea59a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: media: mxl111sf: change mutex_init() location", "id": "2293245", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293245"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmedia: mxl111sf: change mutex_init() location\nSyzbot reported, that mxl111sf_ctrl_msg() uses uninitialized\nmutex. The problem was in wrong mutex_init() location.\nPrevious mutex_init(&state->msg_lock) call was in ->init() function, but\ndvb_usbv2_init() has this order of calls:\ndvb_usbv2_init()\ndvb_usbv2_adapter_init()\ndvb_usbv2_adapter_frontend_init()\nprops->frontend_attach()\nprops->init()\nSince mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach()\ninternally we need to initialize state->msg_lock before\nfrontend_attach(). To achieve it, ->probe() call added to all mxl111sf_*\ndevices, which will simply initiaize mutex."], "name": "CVE-2021-47583", "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": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47583\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47583\nhttps://lore.kernel.org/linux-cve-announce/2024061916-CVE-2021-47583-b02c@gregkh/T"], "threat_severity": "Low"}

{}