ghsa-r7gr-mhrj-m5wq
Vulnerability from github
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
{ "affected": [], "aliases": [ "CVE-2021-47479" ], "database_specific": { "cwe_ids": [], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-05-22T09:15:09Z", "severity": null }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8712: fix use-after-free in rtl8712_dl_fw\n\nSyzbot reported use-after-free in rtl8712_dl_fw(). The problem was in\nrace condition between r871xu_dev_remove() -\u003endo_open() callback.\n\nIt\u0027s easy to see from crash log, that driver accesses released firmware\nin -\u003endo_open() callback. It may happen, since driver was releasing\nfirmware _before_ unregistering netdev. Fix it by moving\nunregister_netdev() before cleaning up resources.\n\nCall Trace:\n...\n rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]\n rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170\n rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]\n rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394\n netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380\n __dev_open+0x2bc/0x4d0 net/core/dev.c:1484\n\nFreed by task 1306:\n...\n release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053\n r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599\n usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458", "id": "GHSA-r7gr-mhrj-m5wq", "modified": "2024-05-22T09:31:46Z", "published": "2024-05-22T09:31:46Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47479" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506" } ], "schema_version": "1.4.0", "severity": [] }
Sightings
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