CVE-2026-98851 - netfilter: nft_flow_offload: drop flowtable reference on init error path

CVE-2026-98851 - netfilter: nft_flow_offload: drop flowtable reference on init error path

https://cvefeed.io/rssfeed/latest.atom / Sun, 10/18/2026 - 19:53
CVE ID :CVE-2026-98851
Published : Oct. 18, 2026, 4:17 p.m. | 1 hour, 32 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_flow_offload: drop flowtable reference on init error path nft_flow_offload_init() bumps the flowtable use count with nft_use_inc() before calling nf_ct_netns_get(). When the latter fails, the error is returned as-is and the reference is leaked. The upper layers do not balance it either: nf_tables_newexpr() clears expr->ops when the expression init callback fails, so the nft_expr_more() iteration in nft_rule_expr_deactivate() and nf_tables_rule_destroy() stops right before the failed expression and its ->destroy callback, which would drop the reference, never runs. Each failed rule addition therefore leaks one flowtable reference and the flowtable can no longer be removed: NFT_MSG_DELFLOWTABLE keeps reporting -EBUSY even though no rule references it. Save the nf_ct_netns_get() return value and undo the nft_use_inc() when it fails, restoring the inc/dec pairing within nft_flow_offload_init() itself.
Severity: 0.0 | NA
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