CVE-2026-31663

Published: April 25, 2026Last modified: April 25, 2026

Description

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

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
• https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
• https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2