CVE-2026-72418High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: prevent connlimit drops for early confirmed ct Commit 69894e5b4c5e ("netfilter: nft_connlimit: update the count if add was skipped") introduce…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conncount: prevent connlimit drops for early confirmed ct
Commit 69894e5b4c5e ("netfilter: nft_connlimit: update the count if add was skipped") introduced a regression where packets for valid connections are dropped when using connlimit for soft-limiting scenarios.
The issue occurs when a new connection reuses a socket currently in the TIME_WAIT state. In this scenario, the connection tracking entry is evaluated as already confirmed. Previously, __nf_conncount_add() assumed that if a connection was confirmed and did not originate from the loopback interface, it should skip the addition and return -EEXIST.
Skipping the addition triggers a garbage collection run that cleans up the TIME_WAIT connection. Consequently, the active connection count drops to 0, which xt_connlimit mishandles, leading to the false rejection of the perfectly valid new connection.
Fix this by replacing the interface check with protocol-agnostic state checks. We now skip the tree insertion and preserve the lockless garbage collection optimization only if the connection is IPS_ASSURED. This allows early-confirmed setup packets (such as reused TIME_WAIT sockets or locally generated SYN-ACKs) to be properly evaluated and counted without falsely dropping. The goto check_connections path is maintained to ensure these setup packets are deduplicated correctly.
This has been tested with slowhttptest and HTTP server configured locally to ensure we are not breaking soft-limiting scenarios for local or external connections. In addition, it was tested with a OVS zone limit too.
Linux >= 460c112e1d887b58b06b56e8e0230058906ff2c3 < 000ac6830b56499d6b65fd91486ce6689eb02be4Linux >= 53bc0ac47f4f7621c991807bc90e01df49561ac8 < cbe2d14a7c5b1fc71821fbfee5c4963917411e92Linux >= ca8b4d1d6304a84ce2016fa2fe9a114b9607b839 < 3793d24de224943e0a6016bbeffb6f5c4cea2e3dLinux >= 8286c02fe9100330475331253fc590f047963f90 < abef7f817217fcb62c11821d6b895063eadb2828Linux >= b29ddccf36946a90323486221f39e9f88cc01b8e < ebfe8249ba79e4ff0f1e3aad8787b992ef27f026Linux >= 77ea3d8ac3d3d59b5ac9ad639e4ba107c0f2ff1e < 329f2626ee5cb8fafdf6b58b624311529c57cb45Linux >= 69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e < be52572c6d55f677ba76869d3c63805c0d4891a3Linux >= 69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e < c8b6f36f766991e3ebebec6596daee4b04dcbc49Linux f85623af16b83615e5f64a9b19ae1d584805cb07Linux >= 5.10.248 < 5.10.261Linux >= 5.15.198 < 5.15.212Linux >= 6.1.160 < 6.1.178Linux >= 6.6.120 < 6.6.145Linux >= 6.12.63 < 6.12.97Linux >= 6.18.2 < 6.18.40Linux >= 6.17.13 < 6.18Linux 6.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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