CVE-2021-47479

{"id": "CVE-2021-47479", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.0, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.0}]}, "published": "2024-05-22T09:15:09.817", "references": [{"url": "https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8712: fix use-after-free in rtl8712_dl_fw\n\nSyzbot reported use-after-free in rtl8712_dl_fw(). The problem was in\nrace condition between r871xu_dev_remove() ->ndo_open() callback.\n\nIt's easy to see from crash log, that driver accesses released firmware\nin ->ndo_open() callback. It may happen, since driver was releasing\nfirmware _before_ unregistering netdev. Fix it by moving\nunregister_netdev() before cleaning up resources.\n\nCall Trace:\n...\n rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]\n rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170\n rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]\n rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394\n netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380\n __dev_open+0x2bc/0x4d0 net/core/dev.c:1484\n\nFreed by task 1306:\n...\n release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053\n r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599\n usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: staging: rtl8712: corrige el use-after-free en rtl8712_dl_fw Syzbot inform\u00f3 el use-after-free en rtl8712_dl_fw(). El problema estaba en la condici\u00f3n de ejecuci\u00f3n entre la devoluci\u00f3n de llamada r871xu_dev_remove() ->ndo_open(). Es f\u00e1cil ver en el registro de fallos que el controlador accede al firmware lanzado en la devoluci\u00f3n de llamada ->ndo_open(). Puede suceder, ya que el controlador estaba lanzando el firmware _antes_ de cancelar el registro de netdev. Solucionarlo moviendo unregister_netdev() antes de limpiar los recursos. Traza de llamada: ... RTL871X_OPEN_FW : 330 [ inline] rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394 netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380 __dev_open+0x2bc/0x4d0 net/core/dev.c:1484 Liberado por tarea 1306: ... release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053 r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver .c:458"}], "lastModified": "2025-09-24T19:04:38.687", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "46C6E342-8AB5-485B-B993-28AF7F43261E", "versionEndExcluding": "3.3", "versionStartIncluding": "3.2.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02912AB8-E6EC-4820-8783-665B58944796", "versionEndExcluding": "5.10.79", "versionStartIncluding": "3.3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B51F6469-3DD9-4E3B-8BD5-2E6911301BF1", "versionEndExcluding": "5.14.18", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9BFCBC65-4DA5-4C88-B852-E7B052DE9F20", "versionEndExcluding": "5.15.2", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.3:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "938CA222-4FA5-49B6-B828-242572B8208E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.3:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A914303E-1CB6-4AAD-9F5F-DE5433C4E814"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.3:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "203BBA69-90B2-4C5E-8023-C14180742421"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.3:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0DBFAB53-B889-4028-AC0E-7E165B152A18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.3:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FE409AEC-F677-4DEF-8EB7-2C35809043CE"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}