CVE-2026-99031 (GCVE-0-2026-99031)
Vulnerability from cvelistv5
Published
2026-10-23 12:21
Modified
2026-10-30 12:41
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
Version: 8266a0491e92d39dc9af739e8380a0daa9b8836b
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_multicast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0ed8edcbcf2290dba13c1beeba27fc19ad38515b",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "6a7385f6605958aa69eeb185c91f45d77640d1e2",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "26142868b0767e95e28b7a1237f58b292b54d1d9",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "2fb87c6025f90191516bee3ce14b42eb3e1cfed7",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "d109141ba14652146089ef78b32d5e4d5285ebad",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "7931fb9181421953f3133b408b0f2e2b8dd68b61",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            },
            {
              "lessThan": "5158353121bae4f552cb677ce8c5c3ef52f93a0d",
              "status": "affected",
              "version": "8266a0491e92d39dc9af739e8380a0daa9b8836b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_multicast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.273",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.224",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: avoid recursive multicast port cleanup\n\nbr_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL\nport groups by calling br_multicast_del_pg(). For S,G entries, that\ndeletion calls back into br_multicast_sg_del_exclude_ports(), so a large\nnumber of STAR_EXCL ports consumes one kernel stack frame per port and can\nhit the stack guard page.\n\nKeep the complete port-group deletion path for cleanup, but suppress the\nS,G exclude-port cleanup while that helper is already walking the same\nentry. Normal deletion callers retain the existing behavior."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:04.054Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0ed8edcbcf2290dba13c1beeba27fc19ad38515b"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a7385f6605958aa69eeb185c91f45d77640d1e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/26142868b0767e95e28b7a1237f58b292b54d1d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fb87c6025f90191516bee3ce14b42eb3e1cfed7"
        },
        {
          "url": "https://git.kernel.org/stable/c/d109141ba14652146089ef78b32d5e4d5285ebad"
        },
        {
          "url": "https://git.kernel.org/stable/c/7931fb9181421953f3133b408b0f2e2b8dd68b61"
        },
        {
          "url": "https://git.kernel.org/stable/c/5158353121bae4f552cb677ce8c5c3ef52f93a0d"
        }
      ],
      "title": "net: bridge: avoid recursive multicast port cleanup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99031",
    "datePublished": "2026-10-23T12:21:31.535Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
    "dateUpdated": "2026-10-30T12:41:04.054Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.