CVE-2021-47479
staging: rtl8712: fix use-after-free in rtl8712_dl_fw
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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() ->ndo_open() callback.
It's easy to see from crash log, that driver accesses released firmware
in ->ndo_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
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: staging: rtl8712: corrige el use-after-free en rtl8712_dl_fw Syzbot informó el use-after-free en rtl8712_dl_fw(). El problema estaba en la condición de ejecución entre la devolución de llamada r871xu_dev_remove() ->ndo_open(). Es fácil ver en el registro de fallos que el controlador accede al firmware lanzado en la devolución 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
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-22 CVE Reserved
- 2024-05-22 CVE Published
- 2024-05-23 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/8c213fa59199f9673d66970d6940fa093186642f | Vuln. Introduced | |
| https://git.kernel.org/stable/c/bc5d453eab4506cb52397db8830d1070904265a4 | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.3 < 5.10.79 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 5.10.79" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.3 < 5.14.18 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 5.14.18" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.3 < 5.15.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 5.15.2" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.3 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 5.16" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 3.2.6 Search vendor "Linux" for product "Linux Kernel" and version "3.2.6" | en |
Affected
| ||||||