CVE-2026-80613

Technical Description

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

veth: fix NAPI leak in XDP enable error path

During XDP enablement in veth, if xdp_rxq_info_reg() or

xdp_rxq_info_reg_mem_model() fails, the driver rolls back the changes.

However, the rollback loop:

for (i--; i >= start; i--) {

decrements the loop index 'i' before the first iteration. This

correctly skips unregistering the rxq for the failed index 'i' (as

registration failed or was already cleaned up), but it also

erroneously skips calling netif_napi_deli() for rq[i].xdp_napi.

Since netif_napi_add() was already called for index 'i', this leaves

a dangling napi_struct in the device's napi_list. When the veth

device is later destroyed, the freed queue memory (which contains the

leaked NAPI structure) can be reused.

The subsequent device teardown iterates the NAPI list and

corrupts the reallocated memory, leading to UAF.

Fix this by explicitly deleting the NAPI association for the failed

index 'i' before rolling

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