GHSA-QWFH-HPCH-PH73
Vulnerability from github – Published: 2026-11-03 12:31 – Updated: 2026-11-03 21:32In the Linux kernel, the following vulnerability has been resolved:
tipc: protect node reset trace dump with node lock
The tipc_node_reset_links trace event asks tipc_node_dump() to walk the node's link entries. Unlike the other node events that request link data, this event runs without the node lock.
This permits bearer teardown to free a link while the trace callback is dumping it:
CPU 0 CPU 1 trace_tipc_node_reset_links() tipc_node_dump() l = n->links[0].link tipc_node_write_lock() kfree(l) n->links[0].link = NULL tipc_node_write_unlock() tipc_link_dump(l)
tipc_link_dump() then dereferences the stale pointer. KASAN reported:
BUG: KASAN: slab-use-after-free in tipc_link_dump Read of size 4 by task poc/115 Call Trace: tipc_link_dump+0x10cb/0x16b0 tipc_node_dump+0x4bb/0x740 trace_event_raw_event_tipc_node_class+0x258/0x360 tipc_node_reset_links+0x14d/0x1a0 tipc_rcv+0x13f5/0x3030 tipc_udp_recv+0x4e3/0x670 Allocated by task 0: tipc_link_create+0x1e1/0x1020 tipc_node_check_dest+0x7d2/0x11a0 tipc_disc_rcv+0xdbf/0x1430 Freed by task 89: kfree+0x131/0x3c0 tipc_node_link_down+0x267/0x4b0 tipc_node_delete_links+0xec/0x160 bearer_disable+0x107/0x260
Take the node write lock around the trace event. This serializes the dump against tipc_node_link_down(delete=true), which frees the link under the same write lock.
{
"affected": [],
"aliases": [
"CVE-2026-99246"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-11-03T12:17:31Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: protect node reset trace dump with node lock\n\nThe tipc_node_reset_links trace event asks tipc_node_dump() to walk the\nnode\u0027s link entries. Unlike the other node events that request link data,\nthis event runs without the node lock.\n\nThis permits bearer teardown to free a link while the trace callback is\ndumping it:\n\n CPU 0 CPU 1\n trace_tipc_node_reset_links()\n tipc_node_dump()\n l = n-\u003elinks[0].link\n tipc_node_write_lock()\n kfree(l)\n n-\u003elinks[0].link = NULL\n tipc_node_write_unlock()\n tipc_link_dump(l)\n\ntipc_link_dump() then dereferences the stale pointer. KASAN reported:\n\n BUG: KASAN: slab-use-after-free in tipc_link_dump\n Read of size 4 by task poc/115\n Call Trace:\n tipc_link_dump+0x10cb/0x16b0\n tipc_node_dump+0x4bb/0x740\n trace_event_raw_event_tipc_node_class+0x258/0x360\n tipc_node_reset_links+0x14d/0x1a0\n tipc_rcv+0x13f5/0x3030\n tipc_udp_recv+0x4e3/0x670\n Allocated by task 0:\n tipc_link_create+0x1e1/0x1020\n tipc_node_check_dest+0x7d2/0x11a0\n tipc_disc_rcv+0xdbf/0x1430\n Freed by task 89:\n kfree+0x131/0x3c0\n tipc_node_link_down+0x267/0x4b0\n tipc_node_delete_links+0xec/0x160\n bearer_disable+0x107/0x260\n\nTake the node write lock around the trace event. This serializes the\ndump against tipc_node_link_down(delete=true), which frees the link\nunder the same write lock.",
"id": "GHSA-qwfh-hpch-ph73",
"modified": "2026-11-03T21:32:06Z",
"published": "2026-11-03T12:31:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99246"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6abd93d01b0f495f29201925a5ee8e6a583c4044"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e492cb98ca69cc1145175e23e22e3b84da7f26d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7bb6a35bd6d69019539d8782fb590fd2aa8a3236"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a6101d62ccfa153db8c218ce59362b8e0316fd4f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c8b72ca0918e95f708f67c8b3e69b05290f2b6d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dddf197f29ba5e47a476dde82bf542ca2e0d5e5e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fa8c78c0e49aa11fae116fd841e41aa8f2d68751"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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