{"id":"CVE-2026-72430","summary":"net/sched: act_ct: fix nf_connlabels leak on two error paths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: fix nf_connlabels leak on two error paths\n\ntcf_ct_fill_params() calls nf_connlabels_get() (setting put_labels) when\nTCA_CT_LABELS is present, but two later error sites use a bare return\ninstead of \"goto err\", skipping the err: nf_connlabels_put() cleanup.\nThey also precede the \"p-\u003eput_labels = put_labels\" assignment, so the\ntcf_ct_params_free() fallback does not release the count either. Each\nfailed RTM_NEWACTION on these paths leaks one nf_connlabels reference:\nnet-\u003ect.labels_used is incremented and never released. The action is\nreachable with CAP_NET_ADMIN over the netns, i.e. from an unprivileged\nuser namespace on default-userns kernels.\n\nImpact: an unprivileged user with CAP_NET_ADMIN over a network namespace\n(e.g. via user namespaces) leaks one nf_connlabels reference per failed\nRTM_NEWACTION on the two error paths; net-\u003ect.labels_used is never\nreleased.\n\nThe err: label is safe to reach from both sites: p-\u003etmpl is still NULL\nthere (kzalloc'd, not yet assigned) and nf_ct_put(NULL) is a no-op, so\nno inline release is needed.","modified":"2026-08-18T03:30:58.766469559Z","published":"2026-08-15T05:56:46.178Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72430.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c3d8fc87e10e38fe054ece009d6d1f66bef2cd4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/13b561c893c741635adce3781490a7a1099106c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/16e088016f38cf728a0de709c3335cc5a3850476"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1d51aff78f078af1a80e9496c2f4643f4c0ef0a0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72430.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72430"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"70f06c115bcca26ceeebf938e48bc8143668e38b"},{"fixed":"13b561c893c741635adce3781490a7a1099106c8"},{"fixed":"1d51aff78f078af1a80e9496c2f4643f4c0ef0a0"},{"fixed":"0c3d8fc87e10e38fe054ece009d6d1f66bef2cd4"},{"fixed":"16e088016f38cf728a0de709c3335cc5a3850476"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72430.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72430.json"}}],"schema_version":"1.9.0"}