CVE-2022-49808

{"id": "CVE-2022-49808", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-05-01T15:16:04.130", "references": [{"url": "https://git.kernel.org/stable/c/4e0c19fcb8b5323716140fa82b79aa9f60e60407", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5809fb03942dbac25144db5bebea84fa003ecaca", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: don't leak tagger-owned storage on switch driver unbind\n\nIn the initial commit dc452a471dba (\"net: dsa: introduce tagger-owned\nstorage for private and shared data\"), we had a call to\ntag_ops->disconnect(dst) issued from dsa_tree_free(), which is called at\ntree teardown time.\n\nThere were problems with connecting to a switch tree as a whole, so this\ngot reworked to connecting to individual switches within the tree. In\nthis process, tag_ops->disconnect(ds) was made to be called only from\nswitch.c (cross-chip notifiers emitted as a result of dynamic tag proto\nchanges), but the normal driver teardown code path wasn't replaced with\nanything.\n\nSolve this problem by adding a function that does the opposite of\ndsa_switch_setup_tag_protocol(), which is called from the equivalent\nspot in dsa_switch_teardown(). The positioning here also ensures that we\nwon't have any use-after-free in tagging protocol (*rcv) ops, since the\nteardown sequence is as follows:\n\ndsa_tree_teardown\n-> dsa_tree_teardown_master\n -> dsa_master_teardown\n -> unsets master->dsa_ptr, making no further packets match the\n ETH_P_XDSA packet type handler\n-> dsa_tree_teardown_ports\n -> dsa_port_teardown\n -> dsa_slave_destroy\n -> unregisters DSA net devices, there is even a synchronize_net()\n in unregister_netdevice_many()\n-> dsa_tree_teardown_switches\n -> dsa_switch_teardown\n -> dsa_switch_teardown_tag_protocol\n -> finally frees the tagger-owned storage"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: no filtrar almacenamiento propiedad del etiquetador al desvincular el controlador del conmutador. En la confirmaci\u00f3n inicial dc452a471dba (\"net: dsa: introducir almacenamiento propiedad del etiquetador para datos privados y compartidos\"), ten\u00edamos una llamada a tag_ops->disconnect(dst) emitida desde dsa_tree_free(), que se llama en el momento del desmontaje del \u00e1rbol. Hab\u00eda problemas con la conexi\u00f3n a un \u00e1rbol de conmutadores como un todo, por lo que esto se modific\u00f3 para conectarse a conmutadores individuales dentro del \u00e1rbol. En este proceso, tag_ops->disconnect(ds) se hizo para que se llamara solo desde switch.c (notificadores entre chips emitidos como resultado de cambios din\u00e1micos de protocolo de etiqueta), pero la ruta de c\u00f3digo normal para el desmontaje del controlador no se reemplaz\u00f3 con nada. Resuelva este problema a\u00f1adiendo una funci\u00f3n que haga lo contrario de dsa_switch_setup_tag_protocol(), que se llama desde el punto equivalente en dsa_switch_teardown(). El posicionamiento aqu\u00ed tambi\u00e9n asegura que no tendremos ning\u00fan use-after-free en las operaciones del protocolo de etiquetado (*rcv), ya que la secuencia de desmontaje es la siguiente: dsa_tree_teardown -> dsa_tree_teardown_master -> dsa_master_teardown -> anula el ajuste master->dsa_ptr, lo que hace que no haya m\u00e1s paquetes que coincidan con el controlador de tipo de paquete ETH_P_XDSA -> dsa_tree_teardown_ports -> dsa_port_teardown -> dsa_slave_destroy -> anula el registro de los dispositivos de red DSA, incluso hay un synchronize_net() en unregister_netdevice_many() -> dsa_tree_teardown_switches -> dsa_switch_teardown -> dsa_switch_teardown_tag_protocol -> finalmente libera el almacenamiento propiedad del etiquetador"}], "lastModified": "2025-11-07T19:20:39.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "88695986-D3E6-4EA8-89A8-C813D1E588AB", "versionEndExcluding": "6.0.10", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}