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CVE-2021-47479

Disclosure Date: May 22, 2024 •
CVE-2021-47479
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Description

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

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CVSS V3 Severity and Metrics
Base Score:
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Impact Score:
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Exploitability Score:
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Vector:
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Attack Vector (AV):
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Privileges Required (PR):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
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Utility Class
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Ports
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OS
Unknown
Vulnerable Versions
Linux c430094541a8
Linux not down converted
Prerequisites
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Discovered By
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PoC Author
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Metasploit Module
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Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis