CVE-2026-80714 (GCVE-0-2026-80714)
Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22
VLAI
EPSS
VEX
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)
Assigner
References
8 references
Impacted products
2 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) |
guessed | |
| 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) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_conn.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
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"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
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"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
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},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
"lessThan": "e7acfc990c29890c883d0d0ce3f737d003a43b44",
"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
"lessThan": "a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b",
"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_conn.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.36"
},
{
"lessThan": "2.6.36",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "2.6.36",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "2.6.36",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T06:22:30.808Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/06d1d9b56ef8132fbf85006885eb43d9510b8b02"
},
{
"url": "https://git.kernel.org/stable/c/acbdc276091b308ca7794acb86e761f8203e2f59"
},
{
"url": "https://git.kernel.org/stable/c/300348e3ba1521b003d59825f97e24f9a6859688"
},
{
"url": "https://git.kernel.org/stable/c/44af98cc7d5ef8e730488d5df1eecd5deeaa5947"
},
{
"url": "https://git.kernel.org/stable/c/4649e6faeecdc2d44bfa6ccbe405eef27e55d816"
},
{
"url": "https://git.kernel.org/stable/c/b5ee5b266f833601ac4817f6df0bc496fc376a28"
},
{
"url": "https://git.kernel.org/stable/c/e7acfc990c29890c883d0d0ce3f737d003a43b44"
},
{
"url": "https://git.kernel.org/stable/c/a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b"
}
],
"title": "ipvs: do not propagate one-packet flag to synced conns",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-80714",
"date": "2026-08-28",
"epss": "0.00164",
"percentile": "0.0589"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-80714\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:57.053\",\"lastModified\":\"2026-08-29T07:16:52.880\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/ipvs/ip_vs_conn.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"06d1d9b56ef8132fbf85006885eb43d9510b8b02\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"acbdc276091b308ca7794acb86e761f8203e2f59\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"300348e3ba1521b003d59825f97e24f9a6859688\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"44af98cc7d5ef8e730488d5df1eecd5deeaa5947\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"4649e6faeecdc2d44bfa6ccbe405eef27e55d816\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"b5ee5b266f833601ac4817f6df0bc496fc376a28\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"e7acfc990c29890c883d0d0ce3f737d003a43b44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26ec037f9841e49cc5c615deb8e1e73e5beab2ca\",\"lessThan\":\"a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/ipvs/ip_vs_conn.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.36\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.36\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"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:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06d1d9b56ef8132fbf85006885eb43d9510b8b02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/300348e3ba1521b003d59825f97e24f9a6859688\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44af98cc7d5ef8e730488d5df1eecd5deeaa5947\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4649e6faeecdc2d44bfa6ccbe405eef27e55d816\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acbdc276091b308ca7794acb86e761f8203e2f59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5ee5b266f833601ac4817f6df0bc496fc376a28\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7acfc990c29890c883d0d0ce3f737d003a43b44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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