UnratedFix available
net: remove WARN_ON_ONCE() from sk_mc_loop()
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.265, 5.15.216, 6.1.183, 6.12.104, 6.18.45, 6.6.152, 7.1.9
- CVEs
- CVE-2026-80733
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 08:58 UTC · Revision 1
Source evidence
net: remove WARN_ON_ONCE() from sk_mc_loop()
core-osv · Original sourcePublished 3 Sept 2026, 08:21 UTC
In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.
osv:CVE-2026-80733
Kernel
Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9
Complete source record
{
"id": "a9a2f8fc6056e6e93d25b41dad64832563a9950ce46bbb36bb269bd766c5931c",
"url": "https://osv.dev/vulnerability/CVE-2026-80733",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "net: remove WARN_ON_ONCE() from sk_mc_loop()",
"summary": "In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.",
"evidence": "osv:CVE-2026-80733",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.265",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.216",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.183",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.152",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.104",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.45",
"evidence": "/affected/1/ranges"
},
{
"value": "7.1.9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CVE-2026-80733",
"aliases": [
"CVE-2026-80733"
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90"
},
{
"fixed": "97133c4d42654578fab95abe47359ebe784dde18"
},
{
"fixed": "f625c742b33dc137c209dd13d1c5f12b1c18d71c"
},
{
"fixed": "ad7fa2f411cb30f63d6725f111be134064cdb718"
},
{
"fixed": "d2adc4e80b29e58b5162ae09f0f657a215806c8c"
},
{
"fixed": "ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"
},
{
"fixed": "c8f256dc849205ccb2bd78bd99a3497b972b44e0"
},
{
"fixed": "0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"
},
{
"fixed": "b8a39a09ae4eaae04309e1e38ed6a1101d967496"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.14.40"
},
{
"fixed": "3.15"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.18.13"
},
{
"fixed": "3.19"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.19.6"
},
{
"fixed": "3.20"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "c91f81773cd4bbebfe744e9ab30a7ce093f9b930"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "c8c30b2b17f2133e953850c547e3902c3a3d80e2"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3fe207e4637a2e792c46a08666aa722f77d7f8f7"
}
]
}
],
"versions": [
"v3.14.79",
"v3.14.78",
"v3.14.77",
"v3.14.76",
"v3.14.75",
"v3.14.74",
"v3.14.73",
"v3.14.72",
"v3.14.71",
"v3.14.70",
"v3.14.69",
"v3.14.68",
"v3.14.67",
"v3.14.66",
"v3.14.65",
"v3.14.64",
"v3.14.63",
"v3.14.62",
"v3.14.61",
"v3.14.60",
"v3.14.59",
"v3.14.58",
"v3.14.57",
"v3.14.56",
"v3.14.55",
"v3.14.54",
"v3.14.53",
"v3.14.52",
"v3.14.51",
"v3.14.50",
"v3.14.49",
"v3.14.48",
"v3.14.47",
"v3.14.46",
"v3.14.45",
"v3.14.44",
"v3.14.43",
"v3.14.42",
"v3.14.41",
"v3.14.40",
"v3.18.140",
"v3.18.139",
"v3.18.138",
"v3.18.137",
"v3.18.136",
"v3.18.135",
"v3.18.134",
"v3.18.133",
"v3.18.132",
"v3.18.131",
"v3.18.130",
"v3.18.129",
"v3.18.128",
"v3.18.127",
"v3.18.126",
"v3.18.125",
"v3.18.124",
"v3.18.123",
"v3.18.122",
"v3.18.121",
"v3.18.120",
"v3.18.119",
"v3.18.118",
"v3.18.117",
"v3.18.116",
"v3.18.115",
"v3.18.114",
"v3.18.113",
"v3.18.112",
"v3.18.111",
"v3.18.110",
"v3.18.109",
"v3.18.108",
"v3.18.107",
"v3.18.106",
"v3.18.105",
"v3.18.104",
"v3.18.103",
"v3.18.102",
"v3.18.101",
"v3.18.100",
"v3.18.99",
"v3.18.98",
"v3.18.97",
"v3.18.96",
"v3.18.95",
"v3.18.94",
"v3.18.93",
"v3.18.92",
"v3.18.91",
"v3.18.90",
"v3.18.89",
"v3.18.88",
"v3.18.87",
"v3.18.86",
"v3.18.85",
"v3.18.84",
"v3.18.83",
"v3.18.82",
"v3.18.81",
"v3.18.80",
"v3.18.79",
"v3.18.78",
"v3.18.77",
"v3.18.76",
"v3.18.75",
"v3.18.74",
"v3.18.73",
"v3.18.72",
"v3.18.71",
"v3.18.70",
"v3.18.69",
"v3.18.68",
"v3.18.67",
"v3.18.66",
"v3.18.65",
"v3.18.64",
"v3.18.63",
"v3.18.62",
"v3.18.61",
"v3.18.60",
"v3.18.59",
"v3.18.58",
"v3.18.57",
"v3.18.56",
"v3.18.55",
"v3.18.54",
"v3.18.53",
"v3.18.52",
"v3.18.51",
"v3.18.50",
"v3.18.49",
"v3.18.48",
"v3.18.47",
"v3.18.46",
"v3.18.45",
"v3.18.44",
"v3.18.43",
"v3.18.42",
"v3.18.41",
"v3.18.40",
"v3.18.39",
"v3.18.38",
"v3.18.37",
"v3.18.36",
"v3.18.35",
"v3.18.34",
"v3.18.33",
"v3.18.32",
"v3.18.31",
"v3.18.30",
"v3.18.29",
"v3.18.28",
"v3.18.27",
"v3.18.26",
"v3.18.25",
"v3.18.24",
"v3.18.23",
"v3.18.22",
"v3.18.21",
"v3.18.20",
"v3.18.19",
"v3.18.18",
"v3.18.17",
"v3.18.16",
"v3.18.15",
"v3.18.14",
"v3.18.13",
"v3.19.8",
"v3.19.7",
"v3.19.6"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "5.10.265"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.216"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.183"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.152"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.104"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.45"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.9"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json"
}
}
],
"modified": "2026-10-08T02:52:03.240943114Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f",
"https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18",
"https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe",
"https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718",
"https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496",
"https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0",
"https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c",
"https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-80733",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"
}
},
"related_cves": [
{
"value": "CVE-2026-80733",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 98365,
"published_at": "2026-09-03T08:21:50.136+00:00"
}