ghsa-38qw-v9q4-hm9j
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
configfs: fix a race in configfs_{,un}register_subsystem()
When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic.
One of cases is: A --> B --> C --> D A <-- B <-- C <-- D
delete list_head *B | delete list_head *C
--------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next
Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.
{
"affected": [],
"aliases": [
"CVE-2022-48931"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-22T04:15:16Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix a race in configfs_{,un}register_subsystem()\n\nWhen configfs_register_subsystem() or configfs_unregister_subsystem()\nis executing link_group() or unlink_group(),\nit is possible that two processes add or delete list concurrently.\nSome unfortunate interleavings of them can cause kernel panic.\n\nOne of cases is:\nA --\u003e B --\u003e C --\u003e D\nA \u003c-- B \u003c-- C \u003c-- D\n\n delete list_head *B | delete list_head *C\n--------------------------------|-----------------------------------\nconfigfs_unregister_subsystem | configfs_unregister_subsystem\n unlink_group | unlink_group\n unlink_obj | unlink_obj\n list_del_init | list_del_init\n __list_del_entry | __list_del_entry\n __list_del | __list_del\n // next == C |\n next-\u003eprev = prev |\n | next-\u003eprev = prev\n prev-\u003enext = next |\n | // prev == B\n | prev-\u003enext = next\n\nFix this by adding mutex when calling link_group() or unlink_group(),\nbut parent configfs_subsystem is NULL when config_item is root.\nSo I create a mutex configfs_subsystem_mutex.",
"id": "GHSA-38qw-v9q4-hm9j",
"modified": "2024-08-23T03:30:59Z",
"published": "2024-08-22T06:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48931"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.