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.
CVE-2026-99031
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-99031
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
"lessThan": "695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64",
"versionType": "git"
},
{
"status": "affected",
"version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
"lessThan": "2fb87c6025f90191516bee3ce14b42eb3e1cfed7",
"versionType": "git"
},
{
"status": "affected",
"version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
"lessThan": "d109141ba14652146089ef78b32d5e4d5285ebad",
"versionType": "git"
},
{
"status": "affected",
"version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
"lessThan": "7931fb9181421953f3133b408b0f2e2b8dd68b61",
"versionType": "git"
},
{
"status": "affected",
"version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
"lessThan": "5158353121bae4f552cb677ce8c5c3ef52f93a0d",
"versionType": "git"
}
],
"programFiles": [
"net/bridge/br_multicast.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bridge/br_multicast.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99031
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52865 · Revision 1
- Added to Heist Feed
- Publisher date