CVE-2026-31663
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.
How to fix
- linux linux_kernel3.3, 3.17, 4.15, 6.18.23, 6.19.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.2.100 ≤ v < 3.3, 3.16.55 ≤ v < 3.17, 4.14.24 ≤ v < 4.15, 4.15.1 ≤ v < 6.18.23, 6.19 ≤ v < 6.19.13, 4.15, 7.0 | 3.3, 3.17, 4.15, 6.18.23, 6.19.13 |
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