Answer in brief
CVE-2026-72418 records a High severity (CVSS 7.5) vulnerability in netfilter: nf_conncount: prevent connlimit drops for early confirmed ct. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=460c112e1d887b58b06b56e8e0230058906ff2c3 <000ac6830b56499d6b65fd91486ce6689eb02be4 || >=53bc0ac47f4f7621c991807bc90e01df49561ac8 <cbe2d14a7c5b1fc71821fbfee5c4963917411e92 || >=ca8b4d1d6304a84ce2016fa2fe9a114b9607b839 <3793d24de224943e0a6016bbeffb6f5c4cea2e3d || >=8286c02fe9100330475331253fc590f047963f90 <abef7f817217fcb62c11821d6b895063eadb2828 || >=b29ddccf36946a90323486221f39e9f88cc01b8e <ebfe8249ba79e4ff0f1e3aad8787b992ef27f026 || >=77ea3d8ac3d3d59b5ac9ad639e4ba107c0f2ff1e <329f2626ee5cb8fafdf6b58b624311529c57cb45 || >=69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e <be52572c6d55f677ba76869d3c63805c0d4891a3 || >=69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e <c8b6f36f766991e3ebebec6596daee4b04dcbc49 || f85623af16b83615e5f64a9b19ae1d584805cb07 || >=5.10.248 <5.10.261 || >=5.15.198 <5.15.212 || >=6.1.160 <6.1.178 || >=6.6.120 <6.6.145 || >=6.12.63 <6.12.97 || >=6.18.2 <6.18.40 || >=6.17.13 <6.18 | 000ac6830b56499d6b65fd91486ce6689eb02be4, cbe2d14a7c5b1fc71821fbfee5c4963917411e92, 3793d24de224943e0a6016bbeffb6f5c4cea2e3d, abef7f817217fcb62c11821d6b895063eadb2828, ebfe8249ba79e4ff0f1e3aad8787b992ef27f026, 329f2626ee5cb8fafdf6b58b624311529c57cb45, be52572c6d55f677ba76869d3c63805c0d4891a3, c8b6f36f766991e3ebebec6596daee4b04dcbc49, 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 6.18 |
| Linux/Linuxgeneric | 6.19 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.