{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "c6c86a5e62a4fec36692ddd64b9144b660f71f96"
            },
            {
              "fixed": "1035bdef1efb9b1076d1a57b81e08c637ff08ecc"
            },
            {
              "fixed": "3537961df2163258bddc230db0e18dc14e925ea6"
            },
            {
              "fixed": "03a9d10ecf71f54b2af8020935f2033d4a132be5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89478.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: drop a chunk if its transport was removed\n\nsctp_rcv() resolves the transport once per packet and leaves it in\nchunk-\u003etransport. The lookup reference, or the one sctp_add_backlog() takes\nif the socket is owned by userspace, keeps it around until the chunk has\nbeen processed.\n\nAn authenticated ASCONF DEL-IP can remove it in the meantime.\nsctp_assoc_rm_peer() takes the transport out of the association and calls\nsctp_transport_free(), which tags it dead and drops the reference the\nassociation held. There is a window on both paths: the packet can sit on\nthe socket backlog, and on the direct path the lookup completes before\nbh_lock_sock().\n\nThe DATA chunk in that packet puts the removed transport back into\nasoc-\u003epeer.last_data_from. Once the packet is done that reference goes\naway and the transport is freed by RCU, so the next delayed SACK carries\nthe pointer into the SACK chunk and sctp_outq_select_transport() reads the\nfreed transport's state.\n\nDrop the chunk in sctp_inq_push(), next to the existing rcvr-\u003edead check.\nBoth paths reach it with the association's socket lock held. The peer\nretransmits it.",
  "id": "CVE-2026-89478",
  "modified": "2026-09-13T03:30:53.002723844Z",
  "published": "2026-09-11T19:43:34.588Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89478.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89478"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "sctp: drop a chunk if its transport was removed"
}