{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a6acb535afb2a3b688a7858f05b61f0433e480d5"
            },
            {
              "fixed": "46ec55855c972504258c371677ac039ba20e5d12"
            },
            {
              "fixed": "ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe"
            },
            {
              "fixed": "fe2a42789c12eb7c5d3a42191e2cc735a6c35ead"
            },
            {
              "fixed": "ab1404ac81154a89fb61ac50ae9a04cd8d4834dc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98487.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mdb: restart port group walk after deletion\n\nbr_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking\nmp-\u003eports. br_multicast_del_pg() can re-enter the same MDB entry through\nbr_multicast_sg_del_exclude_ports() and unlink other port groups. If the\ncursor points into one of those groups, the next iteration dereferences a\nstale cursor and can leave mp-\u003eports pointing at freed memory.\n\nA following RTM_GETMDB exposes the dangling pointer:\n\n  BUG: KASAN: slab-use-after-free in br_mdb_dump\n  Read of size 8\n    br_mdb_dump\n    rtnl_mdb_dump\n    rtnl_dumpit\n    netlink_dump\n\nReset the cursor to mp-\u003eports after every deletion. The deletion removes at\nleast the selected group, so the restarted walk always makes progress.",
  "id": "CVE-2026-98487",
  "modified": "2026-10-20T02:31:12.367308061Z",
  "published": "2026-10-18T15:16:04.746Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46ec55855c972504258c371677ac039ba20e5d12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab1404ac81154a89fb61ac50ae9a04cd8d4834dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe2a42789c12eb7c5d3a42191e2cc735a6c35ead"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98487.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98487"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net: bridge: mdb: restart port group walk after deletion"
}