CVE-2021-47479
- Source
- https://cve.org/CVERecord?id=CVE-2021-47479
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47479.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47479
- Downstream
- Related
- Published
- 2024-05-22T09:15:09.817Z
- Modified
- 2026-02-11T06:36:26.416216Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
staging: rtl8712: fix use-after-free in rtl8712dlfw
Syzbot reported use-after-free in rtl8712dlfw(). The problem was in race condition between r871xudevremove() ->ndo_open() callback.
It's easy to see from crash log, that driver accesses released firmware in ->ndoopen() callback. It may happen, since driver was releasing firmware _before unregistering netdev. Fix it by moving unregister_netdev() before cleaning up resources.
Call Trace: ... rtl871xopenfw drivers/staging/rtl8712/halinit.c:83 [inline] rtl8712dlfw+0xd95/0xe10 drivers/staging/rtl8712/halinit.c:170 rtl8712halinit drivers/staging/rtl8712/halinit.c:330 [inline] rtl871xhalinit+0xae/0x180 drivers/staging/rtl8712/halinit.c:394 netdevopen+0xe6/0x6c0 drivers/staging/rtl8712/osintfs.c:380 _devopen+0x2bc/0x4d0 net/core/dev.c:1484
Freed by task 1306: ... releasefirmware+0x1b/0x30 drivers/base/firmwareloader/main.c:1053 r871xudevremove+0xcc/0x2c0 drivers/staging/rtl8712/usbintf.c:599 usbunbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedc16fa4f2ad19908a47c63d8fa436a1178438c7e7