CVE-2026-72407

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

geneve: validate inner network offset in geneve_gro_complete()

Even with both paths gated on gs->gro_hint, geneve_gro_complete()

re-derives the inner dispatch type and length from the packet and the

current gs->gro_hint, independently of geneve_gro_receive(). The two can

disagree if gs->gro_hint flips under a concurrent geneve_quiesce()/

geneve_unquiesce() (sk_user_data is NULL across a synchronize_net()), or if

the re-read option bytes differ from the ones receive parsed.

geneve_gro_receive() already records the inner network header position in

NAPI_GRO_CB()->inner_network_offset. Have geneve_gro_complete() compute the

offset it is about to dispatch at, adding ETH_HLEN in the ETH_P_TEB case

where eth_gro_complete() steps over the inner MAC header, and bail out if

it lands past inner_network_offset.

Use a lower bound rather than exact equality: between gh_len and the inner

L3 header, geneve_gro_receive() may also h

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References