CVE-2022-49195

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{}

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The Nth switch will set up the whole tree on\ntheir behalf.\n\nThe implication is that for (N - 1) switches, the driver binds to the\ndevice successfully, without doing anything. When the driver is bound,\nthe ->shutdown() method may run. But if the Nth switch has failed to\ninitialize the tree, there is nothing to do for the (N - 1) driver\ninstances, since the slave devices have not been created, etc. Moreover,\ndsa_switch_shutdown() expects that the calling @ds has been in fact\ninitialized, so it jumps at dereferencing the various data structures,\nwhich is incorrect.\n\nAvoid the ensuing NULL pointer dereferences by simply checking whether\nthe Nth switch has previously set \"ds->setup = true\" for the switch\nwhich is currently shutting down. The entire setup is serialized under\ndsa2_mutex which we already hold."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: fix panic on shutting if multi-chip tree failed to probe El sondeo de DSA es at\u00edpico porque un \u00e1rbol de dispositivos debe sondear todos a la vez, por lo que de N switches que llaman a dsa_tree_setup_routing_table() durante el sondeo, para (N - 1) de ellos, \"complete\" devolver\u00e1 false y saldr\u00e1n del sondeo antes de tiempo. El Nth switch configurar\u00e1 todo el \u00e1rbol en su nombre. La implicaci\u00f3n es que para (N - 1) switches, el controlador se vincula al dispositivo con \u00e9xito, sin hacer nada. Cuando el controlador est\u00e1 vinculado, el m\u00e9todo ->shutdown() puede ejecutarse. Pero si el Nth switch no ha podido inicializar el \u00e1rbol, no hay nada que hacer para las (N - 1) instancias del controlador, ya que los dispositivos esclavos no se han creado, etc. Adem\u00e1s, dsa_switch_shutdown() espera que el @ds que llama se haya inicializado de hecho, por lo que salta a desreferenciar las diversas estructuras de datos, lo cual es incorrecto. Evite las desreferencias de puntero NULL resultantes simplemente verificando si el conmutador Nth ha establecido previamente \"ds->setup = true\" para el conmutador que se est\u00e1 apagando actualmente. La configuraci\u00f3n completa est\u00e1 serializada bajo dsa2_mutex que ya tenemos."}], "id": "CVE-2022-49195", "lastModified": "2026-06-17T05:17:21.077", "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": "2025-02-26T07:00:56.580", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fd36358ce82382519b50b05f437493e1e00c4a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95df5cd5a446df6738d2d45872e08594819080e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b6e668ff43ebd87ccc8a19e5481345c428672295"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b864d5350c18bea9369d0bdd9e7eb6f6172cc283"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: dsa: fix panic on shutdown if multi-chip tree failed to probe", "id": "2347922", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347922"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: dsa: fix panic on shutdown if multi-chip tree failed to probe\nDSA probing is atypical because a tree of devices must probe all at\nonce, so out of N switches which call dsa_tree_setup_routing_table()\nduring probe, for (N - 1) of them, \"complete\" will return false and they\nwill exit probing early. The Nth switch will set up the whole tree on\ntheir behalf.\nThe implication is that for (N - 1) switches, the driver binds to the\ndevice successfully, without doing anything. When the driver is bound,\nthe ->shutdown() method may run. But if the Nth switch has failed to\ninitialize the tree, there is nothing to do for the (N - 1) driver\ninstances, since the slave devices have not been created, etc. Moreover,\ndsa_switch_shutdown() expects that the calling @ds has been in fact\ninitialized, so it jumps at dereferencing the various data structures,\nwhich is incorrect.\nAvoid the ensuing NULL pointer dereferences by simply checking whether\nthe Nth switch has previously set \"ds->setup = true\" for the switch\nwhich is currently shutting down. The entire setup is serialized under\ndsa2_mutex which we already hold."], "name": "CVE-2022-49195", "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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49195\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49195\nhttps://lore.kernel.org/linux-cve-announce/2025022616-CVE-2022-49195-740b@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-13T11:14:48.008973+00:00", "updated": "2025-07-13T11:14:48.009032+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}