ghsa-54vm-jhgv-phv5
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()
There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below:
(Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | _rtw_join_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_joinbss_event_prehandle() 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() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.
{
"affected": [],
"aliases": [
"CVE-2022-49311"
],
"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: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()\n\nThere is a deadlock in rtw_joinbss_event_prehandle(), which is shown\nbelow:\n\n (Thread 1) | (Thread 2)\n | _set_timer()\nrtw_joinbss_event_prehandle()| mod_timer()\n spin_lock_bh() //(1) | (wait a time)\n ... | _rtw_join_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\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv-\u003elock in position (2) of thread 2.\nAs a result, rtw_joinbss_event_prehandle() 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() to\nspin_lock_irq() in _rtw_join_timeout_handler() in order to\nprevent deadlock.",
"id": "GHSA-54vm-jhgv-phv5",
"modified": "2025-03-17T21:30:33Z",
"published": "2025-03-17T21:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49311"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/041879b12ddb0c6c83ed9c0bdd10dc82a056f2fc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1f6c99b94ca3caad346876b3e22e3ca3d25bc8ee"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ae60744d5fad840b9d056d35b4b652d95e755846"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eca9748d9267a38d532464e3305a38629e9c35a9"
}
],
"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 |
|---|
Nomenclature
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