ghsa-v579-rch8-988w
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
tipc: move bc link creation back to tipc_node_create
Shuang Li reported a NULL pointer dereference crash:
[] BUG: kernel NULL pointer dereference, address: 0000000000000068 [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc] [] Call Trace: [] [] tipc_bcast_rcv+0xa2/0x190 [tipc] [] tipc_node_bc_rcv+0x8b/0x200 [tipc] [] tipc_rcv+0x3af/0x5b0 [tipc] [] tipc_udp_recv+0xc7/0x1e0 [tipc]
It was caused by the 'l' passed into tipc_bcast_rcv() is NULL. When it creates a node in tipc_node_check_dest(), after inserting the new node into hashtable in tipc_node_create(), it creates the bc link. However, there is a gap between this insert and bc link creation, a bc packet may come in and get the node from the hashtable then try to dereference its bc link, which is NULL.
This patch is to fix it by moving the bc link creation before inserting into the hashtable.
Note that for a preliminary node becoming "real", the bc link creation should also be called before it's rehashed, as we don't create it for preliminary nodes.
{
"affected": [],
"aliases": [
"CVE-2022-49664"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:41Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: move bc link creation back to tipc_node_create\n\nShuang Li reported a NULL pointer dereference crash:\n\n [] BUG: kernel NULL pointer dereference, address: 0000000000000068\n [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc]\n [] Call Trace:\n [] \u003cIRQ\u003e\n [] tipc_bcast_rcv+0xa2/0x190 [tipc]\n [] tipc_node_bc_rcv+0x8b/0x200 [tipc]\n [] tipc_rcv+0x3af/0x5b0 [tipc]\n [] tipc_udp_recv+0xc7/0x1e0 [tipc]\n\nIt was caused by the \u0027l\u0027 passed into tipc_bcast_rcv() is NULL. When it\ncreates a node in tipc_node_check_dest(), after inserting the new node\ninto hashtable in tipc_node_create(), it creates the bc link. However,\nthere is a gap between this insert and bc link creation, a bc packet\nmay come in and get the node from the hashtable then try to dereference\nits bc link, which is NULL.\n\nThis patch is to fix it by moving the bc link creation before inserting\ninto the hashtable.\n\nNote that for a preliminary node becoming \"real\", the bc link creation\nshould also be called before it\u0027s rehashed, as we don\u0027t create it for\npreliminary nodes.",
"id": "GHSA-v579-rch8-988w",
"modified": "2025-03-12T00:31:48Z",
"published": "2025-03-12T00:31:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49664"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35fcb2ba35b4d9b592b558c3bcc6e0d90e213588"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/456bc338871c4a52117dd5ef29cce3745456d248"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cb8092d70a6f5f01ec1490fce4d35efed3ed996c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e52910e671f58c619e33dac476b11b35e2d3ab6f"
}
],
"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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