ghsa-5v2w-fx47-6rq2
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: fix panic during interface removal
Reference counting is used to ensure that batadv_hardif_neigh_node and batadv_hard_iface are not freed before/during batadv_v_elp_throughput_metric_update work is finished.
But there isn't a guarantee that the hard if will remain associated with a soft interface up until the work is finished.
This fixes a crash triggered by reboot that looks like this:
Call trace: batadv_v_mesh_free+0xd0/0x4dc [batman_adv] batadv_v_elp_throughput_metric_update+0x1c/0xa4 process_one_work+0x178/0x398 worker_thread+0x2e8/0x4d0 kthread+0xd8/0xdc ret_from_fork+0x10/0x20
(the batadv_v_mesh_free call is misleading, and does not actually happen)
I was able to make the issue happen more reliably by changing hardif_neigh->bat_v.metric_work work to be delayed work. This allowed me to track down and confirm the fix.
[sven@narfation.org: prevent entering batadv_v_elp_get_throughput without soft_iface]
{
"affected": [],
"aliases": [
"CVE-2025-21781"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-27T03:15:18Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix panic during interface removal\n\nReference counting is used to ensure that\nbatadv_hardif_neigh_node and batadv_hard_iface\nare not freed before/during\nbatadv_v_elp_throughput_metric_update work is\nfinished.\n\nBut there isn\u0027t a guarantee that the hard if will\nremain associated with a soft interface up until\nthe work is finished.\n\nThis fixes a crash triggered by reboot that looks\nlike this:\n\nCall trace:\n batadv_v_mesh_free+0xd0/0x4dc [batman_adv]\n batadv_v_elp_throughput_metric_update+0x1c/0xa4\n process_one_work+0x178/0x398\n worker_thread+0x2e8/0x4d0\n kthread+0xd8/0xdc\n ret_from_fork+0x10/0x20\n\n(the batadv_v_mesh_free call is misleading,\nand does not actually happen)\n\nI was able to make the issue happen more reliably\nby changing hardif_neigh-\u003ebat_v.metric_work work\nto be delayed work. This allowed me to track down\nand confirm the fix.\n\n[sven@narfation.org: prevent entering batadv_v_elp_get_throughput without\n soft_iface]",
"id": "GHSA-5v2w-fx47-6rq2",
"modified": "2025-03-13T15:32:52Z",
"published": "2025-02-27T03:34:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21781"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/072b2787321903287a126c148e8db87dd7ef96fe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/167422a07096a6006599067c8b55884064fa0b72"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/522b1596ea19e327853804da2de60aeb9c5d6f42"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7eb5dd201695645af071592a50026eb780081a72"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ccb7276a6d26d6f8416e315b43b45e15ee7f29e2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce3f1545bf8fa28bd05ec113679e8e6cd23af577"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0a16c6c79768180333f3e41ce63f32730e3c3af"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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