Critical 9.8Published Aug 15, 2026

CVE-2026-72463xfrm: Fix dev use-after-free in xfrm async resumption

Updated under an hour ago (Oct 27, 2026, 9:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In 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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4236c30b437b80f673b9e08c8fae38b8d471ac9e before fed4d3195a31125566876952ce66113ec1eb9008; from 0f451b43c88bf2b9c038b414be580efee42e031b before 1acd93259b6be269e26be5d71c224bccd1f8352f; from 1c428b03840094410c5fb6a5db30640486bbbfcb before 63a30015199912bd5055bead8001b1ae68a67cdb; from 1c428b03840094410c5fb6a5db30640486bbbfcb before 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff; 94439cbe478b53f92223da9aae95fffb28623c3f; 5002beda5cac69d522dc54da0d5d463ed9c963d2; from 6.12.94 before 6.12.112; from 6.18.23 before 6.18.54; and 2 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/fed4d3195a31125566876952ce66113ec1eb9008
https://git.kernel.org/stable/c/1acd93259b6be269e26be5d71c224bccd1f8352f
https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb
https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.