{"id":"DEBIAN-CVE-2021-47479","details":"In the Linux kernel, the following vulnerability has been resolved:  staging: rtl8712: fix use-after-free in rtl8712_dl_fw  Syzbot reported use-after-free in rtl8712_dl_fw(). The problem was in race condition between r871xu_dev_remove() -\u003endo_open() callback.  It's easy to see from crash log, that driver accesses released firmware in -\u003endo_open() callback. It may happen, since driver was releasing firmware _before_ unregistering netdev. Fix it by moving unregister_netdev() before cleaning up resources.  Call Trace: ...  rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]  rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170  rtl8712_hal_init drivers/staging/rtl8712/hal_init.c: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  Freed by task 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","modified":"2026-09-15T09:02:35.828846580Z","published":"2024-05-22T09:15:09.817Z","upstream":["CVE-2021-47479"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47479"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47479.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47479.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47479.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}