CVE-2021-47479
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
staging: rtl8712: fix use-after-free in rtl8712_dl_fw
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
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 8c213fa59199f9673d66970d6940fa093186642f | affected | git | c430094541a80575259a94ff879063ef01473506 | Unavailable | None listed |
| 8c213fa59199f9673d66970d6940fa093186642f | affected | git | befd23bd3b17f1a3f9c943a8580b47444c7c63ed | Unavailable | None listed |
| 8c213fa59199f9673d66970d6940fa093186642f | affected | git | a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4 | Unavailable | None listed |
| 8c213fa59199f9673d66970d6940fa093186642f | affected | git | c052cc1a069c3e575619cf64ec427eb41176ca70 | Unavailable | None listed |
| bc5d453eab4506cb52397db8830d1070904265a4 | affected | git | Unavailable | Unavailable | None listed |
| 3.2.6 | affected | semver | 3.3 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.3 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.3 | Unavailable | None listed |
| 5.10.79 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.14.18 | unaffected | semver | Unavailable | 5.14.* | None listed |
| 5.15.2 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 5.16 | unaffected | original_commit_for_fix | Unavailable | * | None listed |