CVE-2026-31663

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> xfrm: hold dev ref until after transport_finish NF_HOOK<br /> <br /> After async crypto completes, xfrm_input_resume() calls dev_put()<br /> immediately on re-entry before the skb reaches transport_finish.<br /> The skb-&gt;dev pointer is then used inside NF_HOOK and its okfn,<br /> which can race with device teardown.<br /> <br /> Remove the dev_put from the async resumption entry and instead<br /> drop the reference after the NF_HOOK call in transport_finish,<br /> using a saved device pointer since NF_HOOK may consume the skb.<br /> This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip<br /> the okfn.<br /> <br /> For non-transport exits (decaps, gro, drop) and secondary<br /> async return points, release the reference inline when<br /> async is set.