CVE-2026-80714 (GCVE-0-2026-80714)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22
VLAI
Title
ipvs: do not propagate one-packet flag to synced conns
Summary
In the Linux kernel, the following vulnerability has been resolved: ipvs: do not propagate one-packet flag to synced conns Synced connections can be created before their destination exists. When the destination is later added, ip_vs_bind_dest() copies connection flags from the destination into cp->flags. IP_VS_CONN_F_ONE_PACKET connections are not synced. If a synced connection inherits IP_VS_CONN_F_ONE_PACKET while it is already hashed, expiry can treat it as a one-packet connection and skip unlinking the existing conn_tab node, leaving stale hash nodes pointing at a freed struct ip_vs_conn. Drop IP_VS_CONN_F_ONE_PACKET from destination flags when binding synced connections.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < 06d1d9b56ef8132fbf85006885eb43d9510b8b02 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < acbdc276091b308ca7794acb86e761f8203e2f59 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < 300348e3ba1521b003d59825f97e24f9a6859688 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < 44af98cc7d5ef8e730488d5df1eecd5deeaa5947 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < 4649e6faeecdc2d44bfa6ccbe405eef27e55d816 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < b5ee5b266f833601ac4817f6df0bc496fc376a28 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < e7acfc990c29890c883d0d0ce3f737d003a43b44 (git)
Affected: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca , < a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b (git)
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Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "net/netfilter/ipvs/ip_vs_conn.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: do not propagate one-packet flag to synced conns\n\nSynced connections can be created before their destination exists. When\nthe destination is later added, ip_vs_bind_dest() copies connection flags\nfrom the destination into cp-\u003eflags.\n\nIP_VS_CONN_F_ONE_PACKET connections are not synced. If a synced\nconnection inherits IP_VS_CONN_F_ONE_PACKET while it is already hashed,\nexpiry can treat it as a one-packet connection and skip unlinking the\nexisting conn_tab node, leaving stale hash nodes pointing at a freed\nstruct ip_vs_conn.\n\nDrop IP_VS_CONN_F_ONE_PACKET from destination flags when binding synced\nconnections."
        }
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            "version": "3.1"
          },
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              "value": "AV:N - The bug is reached on IPVS backup nodes processing UDP sync datagrams in ip_vs_process_message()/ip_vs_proc_conn() (default multicast 224.0.0.81:8848), and on internet-facing load balancers client UDP traffic drives master sync that creates the hashed backup connection before destination bind.\nAC:L - An attacker can reliably inject or refresh IPVS sync records for UDP connections whose destination is not yet present, then trigger ip_vs_try_bind_dest() once a ONEPACKET destination exists; only optional syncid filtering (often 0) is outside attacker control, and connection expiry is timer-driven without a race.\nPR:N - The backup sync receiver accepts unauthenticated UDP multicast with no capability checks in ip_vs_receive()/ip_vs_process_message(); configuring IPVS/ONEPACKET is an environmental precondition on HA load balancers, not a privilege the remote attacker must hold on the victim host.\nUI:N - Exploitation requires no victim or administrator action at trigger time beyond normal HA IPVS operation; forged or reflected sync traffic and subsequent connection expiry directly invoke the vulnerable bind/unlink path without user interaction.\nS:U - Impact is confined to the kernel IPVS connection table on the affected load-balancer node (stale hash entries to a freed struct ip_vs_conn); it does not cross a VM, container, or IOMMU security boundary.\nC:H - Incorrect ONE_PACKET handling leaves hashed conn_tab nodes pointing at a freed struct ip_vs_conn; subsequent lookups in __ip_vs_conn_in_get() dereference freed slab memory, giving a use-after-free read primitive and potential kernel pointer/data disclosure.\nI:H - The same use-after-free lets attackers influence reuse of the freed ip_vs_conn object and corrupt connection state during later hash-table operations, enabling memory corruption exploitable for arbitrary kernel writes or control-flow hijacking.\nA:H - Dereferencing stale conn_tab entries for a freed connection causes kernel oops/panic; the condition is repeatable by sending additional sync traffic to recreate and expire affected UDP synced connections on the backup node."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:30.808Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "cveId": "CVE-2026-80714",
    "datePublished": "2026-08-28T06:53:13.069Z",
    "dateReserved": "2026-08-26T14:34:25.788Z",
    "dateUpdated": "2026-08-29T06:22:30.808Z",
    "state": "PUBLISHED"
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      "date": "2026-09-22",
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      "percentile": "0.34463"
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      "cve": "CVE-2026-80714",
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      "source": "Microsoft CSAF VEX",
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      "title": "ipvs: do not propagate one-packet flag to synced conns",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80714.json",
      "version": "2"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: do not propagate one-packet flag to synced conns\n\nSynced connections can be created before their destination exists. When\nthe destination is later added, ip_vs_bind_dest() copies connection flags\nfrom the destination into cp-\u003eflags.\n\nIP_VS_CONN_F_ONE_PACKET connections are not synced. If a synced\nconnection inherits IP_VS_CONN_F_ONE_PACKET while it is already hashed,\nexpiry can treat it as a one-packet connection and skip unlinking the\nexisting conn_tab node, leaving stale hash nodes pointing at a freed\nstruct ip_vs_conn.\n\nDrop IP_VS_CONN_F_ONE_PACKET from destination flags when binding synced\nconnections."
          }
        ],
        "id": "CVE-2026-80714",
        "lastModified": "2026-08-29T07:16:52.880",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-28T08:16:57.053",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/06d1d9b56ef8132fbf85006885eb43d9510b8b02"
          },
          {
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            "url": "https://git.kernel.org/stable/c/300348e3ba1521b003d59825f97e24f9a6859688"
          },
          {
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            "url": "https://git.kernel.org/stable/c/44af98cc7d5ef8e730488d5df1eecd5deeaa5947"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4649e6faeecdc2d44bfa6ccbe405eef27e55d816"
          },
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            "url": "https://git.kernel.org/stable/c/e7acfc990c29890c883d0d0ce3f737d003a43b44"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-08T05:09:44+00:00",
      "cve": "CVE-2026-80714",
      "id": "CVE-2026-80714",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipvs: do not propagate one-packet flag to synced conns",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80714.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:09:35Z",
      "cve": "CVE-2026-80714",
      "id": "CVE-2026-80714",
      "initial_release_date": "2026-08-28T16:33:17Z",
      "product_status:first_fixed": "92",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80714",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80714.json",
      "version": "6"
    }
  }
}



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Taxonomy of the tags.





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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.