CVE-2026-72463

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1c428b03840094410c5fb6a5db30640486bbbfcb < 63a30015199912bd5055bead8001b1ae68a67cdbaffected
LinuxLinux1c428b03840094410c5fb6a5db30640486bbbfcb < 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ffaffected
LinuxLinux4236c30b437b80f673b9e08c8fae38b8d471ac9eaffected
LinuxLinux0f451b43c88bf2b9c038b414be580efee42e031baffected
LinuxLinux5002beda5cac69d522dc54da0d5d463ed9c963d2affected
LinuxLinux6.12.94 < 6.13affected
LinuxLinux6.18.23 < 6.19affected
LinuxLinux6.19.13 < 6.20affected
LinuxLinux7.0affected
LinuxLinux0 < 7.0unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References