{"id":"CVE-2021-47479","details":"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() -\u003endo_open() callback.\n\nIt's easy to see from crash log, that driver accesses released firmware\nin -\u003endo_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","modified":"2026-03-14T14:52:53.298003Z","published":"2024-05-22T09:15:09.817Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4"},{"type":"FIX","url":"https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47479.json","unresolved_ranges":[{"events":[{"introduced":"3.2.6"},{"fixed":"3.3"}]},{"events":[{"introduced":"3.3.1"},{"fixed":"5.10.79"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.14.18"}]},{"events":[{"introduced":"5.15"},{"fixed":"5.15.2"}]},{"events":[{"introduced":"0"},{"last_affected":"3.3-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"3.3-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"3.3-rc5"}]},{"events":[{"introduced":"0"},{"last_affected":"3.3-rc6"}]},{"events":[{"introduced":"0"},{"last_affected":"3.3-rc7"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}