ghsa-j5vv-gj42-cwrm
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
scsi: libsas: Fix use-after-free bug in smp_execute_task_sg()
When executing SMP task failed, the smp_execute_task_sg() calls del_timer() to delete "slow_task->timer". However, if the timer handler sas_task_internal_timedout() is running, the del_timer() in smp_execute_task_sg() will not stop it and a UAF will happen. The process is shown below:
(thread 1) | (thread 2)
smp_execute_task_sg() | sas_task_internal_timedout() ... | del_timer() | ... | ... sas_free_task(task) | kfree(task->slow_task) //FREE| | task->slow_task->... //USE
Fix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure the timer handler have finished before the "task->slow_task" is deallocated.
{
"affected": [],
"aliases": [
"CVE-2022-50422"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T12:15:33Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libsas: Fix use-after-free bug in smp_execute_task_sg()\n\nWhen executing SMP task failed, the smp_execute_task_sg() calls del_timer()\nto delete \"slow_task-\u003etimer\". However, if the timer handler\nsas_task_internal_timedout() is running, the del_timer() in\nsmp_execute_task_sg() will not stop it and a UAF will happen. The process\nis shown below:\n\n (thread 1) | (thread 2)\nsmp_execute_task_sg() | sas_task_internal_timedout()\n ... |\n del_timer() |\n ... | ...\n sas_free_task(task) |\n kfree(task-\u003eslow_task) //FREE|\n | task-\u003eslow_task-\u003e... //USE\n\nFix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure\nthe timer handler have finished before the \"task-\u003eslow_task\" is\ndeallocated.",
"id": "GHSA-j5vv-gj42-cwrm",
"modified": "2025-10-01T12:30:27Z",
"published": "2025-10-01T12:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50422"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82ae"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421d"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.