CVE-2026-80714 (GCVE-0-2026-80714)
Vulnerability from cvelistv5
Published
2026-08-28 06:53
Modified
2026-08-29 06:22
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca Version: 26ec037f9841e49cc5c615deb8e1e73e5beab2ca |
||
{
"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": [
{
"lessThan": "06d1d9b56ef8132fbf85006885eb43d9510b8b02",
"status": "affected",
"version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca",
"versionType": "git"
},
{
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"status": "affected",
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},
{
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{
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{
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{
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]
},
{
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"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:*:*:*:*:*:*:*:*",
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{
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
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"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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