Vulnerability Details : CVE-2021-47479
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
Vulnerability category: Memory Corruption
Products affected by CVE-2021-47479
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Exploit prediction scoring system (EPSS) score for CVE-2021-47479
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 15 %
Percentile, the proportion of vulnerabilities that are scored at or less
References for CVE-2021-47479
-
https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70
staging: rtl8712: fix use-after-free in rtl8712_dl_fw - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed
staging: rtl8712: fix use-after-free in rtl8712_dl_fw - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506
staging: rtl8712: fix use-after-free in rtl8712_dl_fw - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4
staging: rtl8712: fix use-after-free in rtl8712_dl_fw - kernel/git/stable/linux.git - Linux kernel stable tree
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