ghsa-6r4h-5jp9-8j35
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drivers: tty: serial: Fix deadlock in sa1100_set_termios()
There is a deadlock in sa1100_set_termios(), which is shown below:
(Thread 1) | (Thread 2) | sa1100_enable_ms() sa1100_set_termios() | mod_timer() spin_lock_irqsave() //(1) | (wait a time) ... | sa1100_timeout() del_timer_sync() | spin_lock_irqsave() //(2) (wait timer to stop) | ...
We hold sport->port.lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need sport->port.lock in position (2) of thread 2. As a result, sa1100_set_termios() will block forever.
This patch moves del_timer_sync() before spin_lock_irqsave() in order to prevent the deadlock.
{
"affected": [],
"aliases": [
"CVE-2022-49304"
],
"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: tty: serial: Fix deadlock in sa1100_set_termios()\n\nThere is a deadlock in sa1100_set_termios(), which is shown\nbelow:\n\n (Thread 1) | (Thread 2)\n | sa1100_enable_ms()\nsa1100_set_termios() | mod_timer()\n spin_lock_irqsave() //(1) | (wait a time)\n ... | sa1100_timeout()\n del_timer_sync() | spin_lock_irqsave() //(2)\n (wait timer to stop) | ...\n\nWe hold sport-\u003eport.lock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need sport-\u003eport.lock in position (2) of thread 2. As a result,\nsa1100_set_termios() will block forever.\n\nThis patch moves del_timer_sync() before spin_lock_irqsave()\nin order to prevent the deadlock.",
"id": "GHSA-6r4h-5jp9-8j35",
"modified": "2025-04-14T21:32:21Z",
"published": "2025-04-14T21:32:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49304"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0976808d0d171ec837d4bd3e9f4ad4a00ab703b8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/09a5958a2452ad22d0cb638711ef34ea1863a829"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2cbfc38df580bff5b2fe19f21c1a7520efcc4b3b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/34d91e555e5582cffdbcbb75517bc9217866823e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/553213432ef0c295becdc08c0207d2094468f673"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/62b2caef400c1738b6d22f636c628d9f85cd4c4c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e2273eefab54a521d9c59efb6e1114e742bdf41"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/920f0ae7a129ffee98a106e3bbdfd61a2a59e939"
}
],
"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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