CVE-2026-72463
Description
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.
How to fix
- Linux Linuxfed4d3195a31125566876952ce66113ec1eb9008, 1acd93259b6be269e26be5d71c224bccd1f8352f, 63a30015199912bd5055bead8001b1ae68a67cdb, 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff, 6.12.112, 6.18.54, 6.2, 6.7, 6.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4236c30b437b80f673b9e08c8fae38b8d471ac9e ≤ v < fed4d3195a31125566876952ce66113ec1eb9008, 0f451b43c88bf2b9c038b414be580efee42e031b ≤ v < 1acd93259b6be269e26be5d71c224bccd1f8352f, 1c428b03840094410c5fb6a5db30640486bbbfcb ≤ v < 63a30015199912bd5055bead8001b1ae68a67cdb, 1c428b03840094410c5fb6a5db30640486bbbfcb ≤ v < 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff, 4d06caedea587c59cc2cc893ceecc57c75c64312, 94439cbe478b53f92223da9aae95fffb28623c3f, 5002beda5cac69d522dc54da0d5d463ed9c963d2, 6.12.94 ≤ v < 6.12.112, 6.18.23 ≤ v < 6.18.54, 6.1.191 ≤ v < 6.2, 6.6.160 ≤ v < 6.7, 6.19.13 ≤ v < 6.20, 7.0 | fed4d3195a31125566876952ce66113ec1eb9008, 1acd93259b6be269e26be5d71c224bccd1f8352f, 63a30015199912bd5055bead8001b1ae68a67cdb, 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff, 6.12.112, 6.18.54, 6.2, 6.7, 6.20 |
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