CVE-2026-72430
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, in the net/sched: act_ct module, there is an nf_connlabels leak on two error paths. tcf_ct_fill_params() calls nf_connlabels_get(), but two later error sites use a bare return instead of goto err, skipping the nf_connlabels_put() cleanup.
Risk Assessment
An unprivileged user with CAP_NET_ADMIN in a network namespace can cause nf_connlabels reference leak, leading to resource exhaustion and potential DoS.
Recommendation
Apply the Linux kernel patch that changes these two error sites to goto err to ensure proper cleanup.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: fix nf_connlabels leak on two error paths tcf_ct_fill_params() calls nf_connlabels_get() (setting put_labels) when TCA_CT_LABELS is present, but two later error sites use a bare return instead of "goto err", skipping the err: nf_connlabels_put() cleanup. They also precede the "p->put_labels = put_labels" assignment, so the tcf_ct_params_free() fallback does not release the count either. Each failed RTM_NEWACTION on these paths leaks one nf_connlabels reference: net->ct.labels_used is incremented and never released. The action is reachable with CAP_NET_ADMIN over the netns, i.e. from an unprivileged user namespace on default-userns kernels. Impact: an unprivileged user with CAP_NET_ADMIN over a network namespace (e.g. via user namespaces) leaks one nf_connlabels reference per failed RTM_NEWACTION on the two error paths; net->ct.labels_used is never released. The err: label is safe to reach from both sites: p->tmpl is still NULL there (kzalloc'd, not yet assigned) and nf_ct_put(NULL) is a no-op, so no inline release is needed.