ghsa-xpwf-pw24-jcwf
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()
There is a deadlock in rtw_surveydone_event_callback(), which is shown below:
(Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...
We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_surveydone_event_callback() will block forever.
This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.
{
"affected": [],
"aliases": [
"CVE-2022-49309"
],
"database_specific": {
"cwe_ids": [
"CWE-667"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:07Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()\n\nThere is a deadlock in rtw_surveydone_event_callback(),\nwhich is shown below:\n\n (Thread 1) | (Thread 2)\n | _set_timer()\nrtw_surveydone_event_callback()| mod_timer()\n spin_lock_bh() //(1) | (wait a time)\n ... | rtw_scan_timeout_handler()\n del_timer_sync() | spin_lock_bh() //(2)\n (wait timer to stop) | ...\n\nWe hold pmlmepriv-\u003elock in position (1) of thread 1 and use\ndel_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv-\u003elock in position (2) of thread 2.\nAs a result, rtw_surveydone_event_callback() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_bh(), which could let timer handler to obtain\nthe needed lock. What`s more, we change spin_lock_bh() in\nrtw_scan_timeout_handler() to spin_lock_irq(). Otherwise,\nspin_lock_bh() will also cause deadlock() in timer handler.",
"id": "GHSA-xpwf-pw24-jcwf",
"modified": "2025-05-02T09:30:30Z",
"published": "2025-03-17T21:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49309"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c84e5c819600ee0628f61b33d145258ae0f3d7a7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
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