net: bridge: avoid recursive multicast port cleanup
In the Linux kernel, the following vulnerability has been resolved: net: bridge: avoid recursive multicast port cleanup br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page. Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.273, 5.15.224, 6.1.191, 6.12.113, 6.18.57, 6.6.160, 7.2.11
- CVEs
- CVE-2026-99031
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 17:30 UTC · Revision 1
Source evidence
net: bridge: avoid recursive multicast port cleanup
core-osv · Original sourcePublished 23 Oct 2026, 12:21 UTC
In the Linux kernel, the following vulnerability has been resolved: net: bridge: avoid recursive multicast port cleanup br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page. Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.
osv:CVE-2026-99031
Kernel
Fixed versions: 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11
Complete source record
{
"id": "bcd734a524ecaebfd8039a35293233c280814802c57bbbe9ddf865041a8eb0e0",
"url": "https://osv.dev/vulnerability/CVE-2026-99031",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "net: bridge: avoid recursive multicast port cleanup",
"summary": "In the Linux kernel, the following vulnerability has been resolved: net: bridge: avoid recursive multicast port cleanup br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page. Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.",
"evidence": "osv:CVE-2026-99031",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.273",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.224",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.191",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.160",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.113",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.57",
"evidence": "/affected/1/ranges"
},
{
"value": "7.2.11",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CVE-2026-99031",
"aliases": [
"CVE-2026-99031"
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "8266a0491e92d39dc9af739e8380a0daa9b8836b"
},
{
"fixed": "0ed8edcbcf2290dba13c1beeba27fc19ad38515b"
},
{
"fixed": "6a7385f6605958aa69eeb185c91f45d77640d1e2"
},
{
"fixed": "26142868b0767e95e28b7a1237f58b292b54d1d9"
},
{
"fixed": "695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64"
},
{
"fixed": "2fb87c6025f90191516bee3ce14b42eb3e1cfed7"
},
{
"fixed": "d109141ba14652146089ef78b32d5e4d5285ebad"
},
{
"fixed": "7931fb9181421953f3133b408b0f2e2b8dd68b61"
},
{
"fixed": "5158353121bae4f552cb677ce8c5c3ef52f93a0d"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99031.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.10.0"
},
{
"fixed": "5.10.273"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.224"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.191"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.160"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.113"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.57"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.2.11"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99031.json"
}
}
],
"modified": "2026-11-01T02:30:32.298366085Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0ed8edcbcf2290dba13c1beeba27fc19ad38515b",
"https://git.kernel.org/stable/c/26142868b0767e95e28b7a1237f58b292b54d1d9",
"https://git.kernel.org/stable/c/2fb87c6025f90191516bee3ce14b42eb3e1cfed7",
"https://git.kernel.org/stable/c/5158353121bae4f552cb677ce8c5c3ef52f93a0d",
"https://git.kernel.org/stable/c/695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64",
"https://git.kernel.org/stable/c/6a7385f6605958aa69eeb185c91f45d77640d1e2",
"https://git.kernel.org/stable/c/7931fb9181421953f3133b408b0f2e2b8dd68b61",
"https://git.kernel.org/stable/c/d109141ba14652146089ef78b32d5e4d5285ebad",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99031.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-99031",
"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/2026/99xxx/CVE-2026-99031.json"
}
},
"related_cves": [
{
"value": "CVE-2026-99031",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 505338,
"published_at": "2026-10-23T12:21:31.535+00:00"
}