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CVE-2026-89478 (GCVE-0-2026-89478)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
sctp: drop a chunk if its transport was removed
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: drop a chunk if its transport was removed sctp_rcv() resolves the transport once per packet and leaves it in chunk->transport. The lookup reference, or the one sctp_add_backlog() takes if the socket is owned by userspace, keeps it around until the chunk has been processed. An authenticated ASCONF DEL-IP can remove it in the meantime. sctp_assoc_rm_peer() takes the transport out of the association and calls sctp_transport_free(), which tags it dead and drops the reference the association held. There is a window on both paths: the packet can sit on the socket backlog, and on the direct path the lookup completes before bh_lock_sock(). The DATA chunk in that packet puts the removed transport back into asoc->peer.last_data_from. Once the packet is done that reference goes away and the transport is freed by RCU, so the next delayed SACK carries the pointer into the SACK chunk and sctp_outq_select_transport() reads the freed transport's state. Drop the chunk in sctp_inq_push(), next to the existing rcvr->dead check. Both paths reach it with the association's socket lock held. The peer retransmits it.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3fc072e7cb4a0ff251d13cfc2d24f62489cd9386 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d7cb5ad832095dc4becfdb2a36007ffd50e49fb0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0422b092a3d43ca462932ff9f747731ca078d1d4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 928fd7920ba37cc5637a211b9be979083413a2fa (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c6c86a5e62a4fec36692ddd64b9144b660f71f96 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1035bdef1efb9b1076d1a57b81e08c637ff08ecc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3537961df2163258bddc230db0e18dc14e925ea6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 03a9d10ecf71f54b2af8020935f2033d4a132be5 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "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\u0027s state.\n\nDrop the chunk in sctp_inq_push(), next to the existing rcvr-\u003edead check.\nBoth paths reach it with the association\u0027s socket lock held. The peer\nretransmits it."
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              "value": "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-\u003epeer.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."
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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\u0027s state.\\n\\nDrop the chunk in sctp_inq_push(), next to the existing rcvr-\u003edead check.\\nBoth paths reach it with the association\u0027s socket lock held. 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    "redhat_vex": {
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      "current_release_date": "2026-09-15T12:24:08+00:00",
      "cve": "CVE-2026-89478",
      "id": "CVE-2026-89478",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: drop a chunk if its transport was removed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89478.json",
      "version": "3"
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      "cve": "CVE-2026-89478",
      "id": "CVE-2026-89478",
      "initial_release_date": "2026-09-16T00:03:10Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89478",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89478.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.