CVE-2026-63913 (GCVE-0-2026-63913)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
Title
netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check An unintended behavior in the TCP conntrack state machine allows a connection to be forced into the CLOSE state using an RST packet with an invalid sequence number. Specifically, after a SYN packet is observed, an RST with an invalid SEQ can transition the conntrack entry to TCP_CONNTRACK_CLOSE, regardless of whether the RST corresponds to the expected reply direction. The relevant code path assumes the RST is a response to an outgoing SYN, but does not validate packet direction or ensure that a matching SYN was actually sent in the opposite direction. As a result, a crafted packet sequence consisting of a SYN followed by an invalid-sequence RST can prematurely terminate an active NAT entry. This makes connection teardown easier than intended. So, tighten the state transition logic to ensure that RST-triggered CLOSE transitions only occur when the RST is a valid response to a previously observed SYN in the correct direction.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 2006979a15af5404bf932a325357683c0bac1656 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 6476c17d536dbd321c073242e762ddb2713a1238 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < f5547bebc416d56f56fb5b86dc20aabfa42165a0 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 2bb6d82b586ea5a4cb73bbdd6b7432e96096bc77 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < f206def4e86d810f927ba1d8e322ea72b29bce58 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < b98ab51c45c5608a1c19ce7fd17a3032469bb83f (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < d67c6adee8d1b65330d0174c4c367faba14e80a8 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < bed6e04be8e6b9133d8b16d5a42d0e0ce674fa9a (git)
Create a notification for this product.
Linux Linux Affected: 2.6.15
Unaffected: 0 , < 2.6.15 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check\n\nAn unintended behavior in the TCP conntrack state machine allows a\nconnection to be forced into the CLOSE state using an RST packet with an\ninvalid sequence number.\n\nSpecifically, after a SYN packet is observed, an RST with an invalid SEQ\ncan transition the conntrack entry to TCP_CONNTRACK_CLOSE, regardless of\nwhether the RST corresponds to the expected reply direction. The relevant\ncode path assumes the RST is a response to an outgoing SYN, but does not\nvalidate packet direction or ensure that a matching SYN was actually sent\nin the opposite direction.\n\nAs a result, a crafted packet sequence consisting of a SYN followed by an\ninvalid-sequence RST can prematurely terminate an active NAT entry. This\nmakes connection teardown easier than intended.\n\nSo, tighten the state transition logic to ensure that RST-triggered\nCLOSE transitions only occur when the RST is a valid response to a\npreviously observed SYN in the correct direction."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code runs in nf_conntrack_tcp_packet() on every TCP packet processed by netfilter conntrack via the NF_INET_PRE_ROUTING and LOCAL_OUT hooks; a remote attacker can deliver the crafted SYN+RST sequence over the network to internet-facing NAT gateways, routers, and servers with connection tracking enabled.\nAC:L - The attacker fully controls the exploit sequence (SYN to annotate last_index/last_end, then RST with matching ack_seq but invalid seq) and can time/retry at will; no race against third parties or rare memory layout is required beyond knowing or observing the target connection 4-tuple.\nPR:N - Exploitation requires only the ability to send TCP packets to a system running conntrack/NAT; no authentication, local shell access, or CAP_NET_ADMIN/netlink configuration is needed to reach the vulnerable state-transition path.\nUI:N - No victim user action (opening files, clicking links, mounting filesystems) is required; the attack is carried out entirely by sending crafted network packets to the target.\nS:U - Impact is confined to incorrect conntrack/NAT state on the same kernel/firewall security authority; it does not cross VM, container, or IOMMU boundaries to affect a separate security domain.\nC:N - This is a state-machine logic bug with no memory corruption, out-of-bounds access, use-after-free, or information disclosure; only connection-tracking metadata is affected.\nI:L - The bug causes unauthorized modification of conntrack connection state (forcing TCP_CONNTRACK_CLOSE and accelerated NAT entry teardown) rather than arbitrary memory or code execution, constituting limited integrity impact on data processed by the conntrack subsystem.\nA:H - Prematurely closing conntrack/NAT entries disrupts active TCP sessions and can be repeated against arbitrary tracked connections without authentication, causing sustained denial of service to affected network flows on NAT gateways and stateful firewalls."
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:37:07.250Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2006979a15af5404bf932a325357683c0bac1656"
        },
        {
          "url": "https://git.kernel.org/stable/c/6476c17d536dbd321c073242e762ddb2713a1238"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5547bebc416d56f56fb5b86dc20aabfa42165a0"
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      "title": "netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63913",
    "datePublished": "2026-07-19T14:55:17.917Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-08-05T12:37:07.250Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63913",
      "date": "2026-08-11",
      "epss": "0.00618",
      "percentile": "0.46402"
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The relevant\\ncode path assumes the RST is a response to an outgoing SYN, but does not\\nvalidate packet direction or ensure that a matching SYN was actually sent\\nin the opposite direction.\\n\\nAs a result, a crafted packet sequence consisting of a SYN followed by an\\ninvalid-sequence RST can prematurely terminate an active NAT entry. This\\nmakes connection teardown easier than intended.\\n\\nSo, tighten the state transition logic to ensure that RST-triggered\\nCLOSE transitions only occur when the RST is a valid response to a\\npreviously observed SYN in the correct direction.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nf_conntrack_proto_tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"2006979a15af5404bf932a325357683c0bac1656\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"6476c17d536dbd321c073242e762ddb2713a1238\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"f5547bebc416d56f56fb5b86dc20aabfa42165a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"2bb6d82b586ea5a4cb73bbdd6b7432e96096bc77\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"f206def4e86d810f927ba1d8e322ea72b29bce58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"b98ab51c45c5608a1c19ce7fd17a3032469bb83f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"d67c6adee8d1b65330d0174c4c367faba14e80a8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"bed6e04be8e6b9133d8b16d5a42d0e0ce674fa9a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nf_conntrack_proto_tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:L/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2006979a15af5404bf932a325357683c0bac1656\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2bb6d82b586ea5a4cb73bbdd6b7432e96096bc77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6476c17d536dbd321c073242e762ddb2713a1238\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b98ab51c45c5608a1c19ce7fd17a3032469bb83f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bed6e04be8e6b9133d8b16d5a42d0e0ce674fa9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d67c6adee8d1b65330d0174c4c367faba14e80a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f206def4e86d810f927ba1d8e322ea72b29bce58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5547bebc416d56f56fb5b86dc20aabfa42165a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T16:07:18+00:00",
      "cve": "CVE-2026-63913",
      "id": "CVE-2026-63913",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63913.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-30T16:35:18Z",
      "cve": "CVE-2026-63913",
      "id": "CVE-2026-63913",
      "initial_release_date": "2026-07-21T13:03:41Z",
      "product_status:known_affected": "294",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63913",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63913.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

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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.