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CVE-2026-72418 (GCVE-0-2026-72418)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
netfilter: nf_conncount: prevent connlimit drops for early confirmed ct
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 460c112e1d887b58b06b56e8e0230058906ff2c3 , < 000ac6830b56499d6b65fd91486ce6689eb02be4 (git)
Affected: 53bc0ac47f4f7621c991807bc90e01df49561ac8 , < cbe2d14a7c5b1fc71821fbfee5c4963917411e92 (git)
Affected: ca8b4d1d6304a84ce2016fa2fe9a114b9607b839 , < 3793d24de224943e0a6016bbeffb6f5c4cea2e3d (git)
Affected: 8286c02fe9100330475331253fc590f047963f90 , < abef7f817217fcb62c11821d6b895063eadb2828 (git)
Affected: b29ddccf36946a90323486221f39e9f88cc01b8e , < ebfe8249ba79e4ff0f1e3aad8787b992ef27f026 (git)
Affected: 77ea3d8ac3d3d59b5ac9ad639e4ba107c0f2ff1e , < 329f2626ee5cb8fafdf6b58b624311529c57cb45 (git)
Affected: 69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e , < be52572c6d55f677ba76869d3c63805c0d4891a3 (git)
Affected: 69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e , < c8b6f36f766991e3ebebec6596daee4b04dcbc49 (git)
Affected: f85623af16b83615e5f64a9b19ae1d584805cb07 (git)
Affected: 5.10.248 , < 5.10.261 (semver)
Affected: 5.15.198 , < 5.15.212 (semver)
Affected: 6.1.160 , < 6.1.178 (semver)
Affected: 6.6.120 , < 6.6.145 (semver)
Affected: 6.12.63 , < 6.12.97 (semver)
Affected: 6.18.2 , < 6.18.40 (semver)
Affected: 6.17.13 , < 6.18 (semver)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "title": "netfilter: nf_conncount: prevent connlimit drops for early confirmed ct",
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    "cveId": "CVE-2026-72418",
    "datePublished": "2026-08-15T05:56:38.374Z",
    "dateReserved": "2026-08-09T03:40:39.927Z",
    "dateUpdated": "2026-08-17T05:43:58.352Z",
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      "cve": "CVE-2026-72418",
      "date": "2026-09-04",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72418\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:15.420\",\"lastModified\":\"2026-08-17T06:19:08.717\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nf_conncount: prevent connlimit drops for early confirmed ct\\n\\nCommit 69894e5b4c5e (\\\"netfilter: nft_connlimit: update the count if add\\nwas skipped\\\") introduced a regression where packets for valid\\nconnections are dropped when using connlimit for soft-limiting\\nscenarios.\\n\\nThe issue occurs when a new connection reuses a socket currently in\\nthe TIME_WAIT state. In this scenario, the connection tracking entry\\nis evaluated as already confirmed. Previously, __nf_conncount_add()\\nassumed that if a connection was confirmed and did not originate from\\nthe loopback interface, it should skip the addition and return -EEXIST.\\n\\nSkipping the addition triggers a garbage collection run that cleans up\\nthe TIME_WAIT connection. Consequently, the active connection count\\ndrops to 0, which xt_connlimit mishandles, leading to the false rejection\\nof the perfectly valid new connection.\\n\\nFix this by replacing the interface check with protocol-agnostic state\\nchecks. We now skip the tree insertion and preserve the lockless garbage\\ncollection optimization only if the connection is IPS_ASSURED. This\\nallows early-confirmed setup packets (such as reused TIME_WAIT sockets\\nor locally generated SYN-ACKs) to be properly evaluated and counted\\nwithout falsely dropping. The goto check_connections path is maintained\\nto ensure these setup packets are deduplicated correctly.\\n\\nThis has been tested with slowhttptest and HTTP server configured\\nlocally to ensure we are not breaking soft-limiting scenarios for local\\nor external connections. In addition, it was tested with a OVS zone\\nlimit too.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nf_conncount.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"460c112e1d887b58b06b56e8e0230058906ff2c3\",\"lessThan\":\"000ac6830b56499d6b65fd91486ce6689eb02be4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"53bc0ac47f4f7621c991807bc90e01df49561ac8\",\"lessThan\":\"cbe2d14a7c5b1fc71821fbfee5c4963917411e92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca8b4d1d6304a84ce2016fa2fe9a114b9607b839\",\"lessThan\":\"3793d24de224943e0a6016bbeffb6f5c4cea2e3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8286c02fe9100330475331253fc590f047963f90\",\"lessThan\":\"abef7f817217fcb62c11821d6b895063eadb2828\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29ddccf36946a90323486221f39e9f88cc01b8e\",\"lessThan\":\"ebfe8249ba79e4ff0f1e3aad8787b992ef27f026\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"77ea3d8ac3d3d59b5ac9ad639e4ba107c0f2ff1e\",\"lessThan\":\"329f2626ee5cb8fafdf6b58b624311529c57cb45\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e\",\"lessThan\":\"be52572c6d55f677ba76869d3c63805c0d4891a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e\",\"lessThan\":\"c8b6f36f766991e3ebebec6596daee4b04dcbc49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f85623af16b83615e5f64a9b19ae1d584805cb07\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.248\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.198\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.160\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.120\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.63\",\"lessThan\":\"6.12.97\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.2\",\"lessThan\":\"6.18.40\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.17.13\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nf_conncount.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/000ac6830b56499d6b65fd91486ce6689eb02be4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/329f2626ee5cb8fafdf6b58b624311529c57cb45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3793d24de224943e0a6016bbeffb6f5c4cea2e3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abef7f817217fcb62c11821d6b895063eadb2828\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be52572c6d55f677ba76869d3c63805c0d4891a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8b6f36f766991e3ebebec6596daee4b04dcbc49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbe2d14a7c5b1fc71821fbfee5c4963917411e92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebfe8249ba79e4ff0f1e3aad8787b992ef27f026\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T10:55:47+00:00",
      "cve": "CVE-2026-72418",
      "id": "CVE-2026-72418",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_conncount: prevent connlimit drops for early confirmed ct",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72418.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.