CVE-2021-47479
- Source
- https://cve.org/CVERecord?id=CVE-2021-47479
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47479.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47479
- Downstream
- Related
- Published
- 2024-05-22T09:15:09Z
- Modified
- 2026-03-14T14:52:53Z
- 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 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
- References
Affected packages
Git /
Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47479.json"
unresolved_ranges
[
{
"events": [
{
"introduced": "3.2.6"
},
{
"fixed": "3.3"
}
]
},
{
"events": [
{
"introduced": "3.3.1"
},
{
"fixed": "5.10.79"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.14.18"
}
]
},
{
"events": [
{
"introduced": "5.15"
},
{
"fixed": "5.15.2"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "3.3-NA"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "3.3-rc4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "3.3-rc5"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "3.3-rc6"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "3.3-rc7"
}
]
}
]