{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89478",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89478"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "sctp: drop a chunk if its transport was removed",
  "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->transport. 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->peer.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->dead check.\nBoth paths reach it with the association's socket lock held. The peer\nretransmits it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89478"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3fc072e7cb4a0ff251d13cfc2d24f62489cd9386"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d7cb5ad832095dc4becfdb2a36007ffd50e49fb0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0422b092a3d43ca462932ff9f747731ca078d1d4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/928fd7920ba37cc5637a211b9be979083413a2fa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - A remote SCTP peer reaches the bug via received packets in sctp_rcv() on internet-facing SCTP servers and telecom endpoints; DATA that already resolved a transport is processed after an authenticated ASCONF DEL-IP (or COOKIE-ECHO restart) has removed that peer.\nAC:L - The attacker controls both sides of the race by sending ASCONF DEL-IP (or a restart that calls sctp_assoc_rm_peer) and a DATA chunk whose lookup already holds the doomed transport; the backlog path is FIFO-deterministic while the socket is in a syscall, and the direct path is a bh_lock_sock race the attacker creates.\nPR:N - Exploitation requires only a network-reachable established SCTP association; no local Linux credentials, capabilities, or namespaces are needed, and SCTP-AUTH keys used for ASCONF come from the handshake the peer itself performs.\nUI:N - Inbound SCTP packets are processed automatically in softirq or socket backlog on a listening or already-associated endpoint; no victim user action such as opening a file or mounting a device is required.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the host SCTP stack; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - DATA processing plants the removed transport into asoc->peer.last_data_from; after the lookup reference is dropped the object is RCU-freed, and the next delayed SACK dereferences the freed sctp_transport in sctp_outq_select_transport(), a UAF that enables arbitrary kernel disclosure via heap grooming.\nI:H - sctp_outq_select_transport() does list_add_tail() into the freed send_ready field, and sctp_packet_config()/sctp_transport_burst_limited() write vtag, pathmtu, cwnd, and burst_limited into the reclaimed slab object, yielding arbitrary write and control-flow hijack primitives.\nA:H - Dereferencing the freed transport during delayed SACK transmission can immediately oops or panic the kernel, and the UAF can be triggered repeatedly by a malicious SCTP peer."
    }
  }
}