GHSA-23R2-6GQR-3M38
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-10-03 12:31In the Linux kernel, the following vulnerability has been resolved:
xfrm: Fix dev use-after-free in xfrm async resumption
xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below:
unregister_netdevice: waiting for vti1 to become free. Usage count = -2
Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races.
{
"affected": [],
"aliases": [
"CVE-2026-72463"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:20Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb-\u003edev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb-\u003edev to tunnel dev without taking\ndevice reference, such as vti_rcv_cb. The subsequent async resumption\nwill decrement the tunnel device\u0027s reference count, which lead to uaf\nof tunnel dev and refcnt leak of orig dev as below:\n\nunregister_netdevice: waiting for vti1 to become free. Usage count = -2\n\nStash the original skb-\u003edev to fix refcnt imbalance. The new skb-\u003edev set\nby xfrm_rcv_cb can race with device teardown. Extend rcu protection over\nxfrm_rcv_cb and transport_finish to prevent races.",
"id": "GHSA-23r2-6gqr-3m38",
"modified": "2026-10-03T12:31:03Z",
"published": "2026-08-15T06:32:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72463"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1acd93259b6be269e26be5d71c224bccd1f8352f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fed4d3195a31125566876952ce66113ec1eb9008"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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