CVE-2026-74588 (GCVE-0-2026-74588)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
sctp: keep chunk->transport in step with the list it is queued on
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: keep chunk->transport in step with the list it is queued on __sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport's transmitted list without updating chunk->transport: if (chunk->tsn_gap_acked) { list_move_tail(&chunk->transmitted_list, &transport->transmitted); continue; } The chunk then sits on a live transport's list while chunk->transport still names a different one. If that transport is removed - sctp_assoc_rm_peer() from an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk is left with a dangling pointer. sctp_assoc_rm_peer() scrubs peer->transmitted and asoc->outqueue.out_chunk_list, but the chunk is on neither. The pointer is not followed while tsn_gap_acked is set. A SACK that reneges on the TSN clears the flag, and the next SACK reaches tchunk->transport->flight_size -= sctp_data_size(tchunk); inside the freed transport. KASAN reports a slab-use-after-free read in sctp_check_transmitted(), freed from sctp_assoc_rm_peer(). Both the removal and the SACKs come from the association peer. Set chunk->transport at the move. The ordinary resend path needs nothing: it reaches its list_move_tail() only after sctp_packet_append_chunk() returned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the chunk by then. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6575fb17230814b48b471727c8410c0aadff9274 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6b9e2ea2057113f3393990ba646d2d97c719a80d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 874a7c2b5e184f06134fdfde27e9ce9271bafe58 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1adf929121e13e0b19200bb9fef715b918d483fe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e2e7c1de0e226ca1b7fea2de57a6c9bca408709b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9f2cf069a9a72a2d6b97ca8b4c70e714aac99749 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: keep chunk-\u003etransport in step with the list it is queued on\n\n__sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport\u0027s\ntransmitted list without updating chunk-\u003etransport:\n\n\tif (chunk-\u003etsn_gap_acked) {\n\t\tlist_move_tail(\u0026chunk-\u003etransmitted_list,\n\t\t\t       \u0026transport-\u003etransmitted);\n\t\tcontinue;\n\t}\n\nThe chunk then sits on a live transport\u0027s list while chunk-\u003etransport still\nnames a different one.  If that transport is removed - sctp_assoc_rm_peer()\nfrom an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk\nis left with a dangling pointer.  sctp_assoc_rm_peer() scrubs\npeer-\u003etransmitted and asoc-\u003eoutqueue.out_chunk_list, but the chunk is on\nneither.\n\nThe pointer is not followed while tsn_gap_acked is set.  A SACK that\nreneges on the TSN clears the flag, and the next SACK reaches\n\n\ttchunk-\u003etransport-\u003eflight_size -= sctp_data_size(tchunk);\n\ninside the freed transport.  KASAN reports a slab-use-after-free read in\nsctp_check_transmitted(), freed from sctp_assoc_rm_peer().  Both the\nremoval and the SACKs come from the association peer.\n\nSet chunk-\u003etransport at the move.  The ordinary resend path needs nothing:\nit reaches its list_move_tail() only after sctp_packet_append_chunk()\nreturned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the\nchunk by then.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The bug is reached when the kernel SCTP stack processes inbound SACK and ASCONF chunks from a remote association peer via sctp_rcv()/sctp_inq_push(), with no local syscall or ioctl required on the victim.\nAC:L - The remote peer controls the SCTP protocol sequence (gap SACKs, ADDIP multihoming, ASCONF Delete-IP, and SACK reneging) needed to strand a chunk and free its transport; no attacker-uncontrollable race or rare memory layout is required.\nPR:N - Exploitation requires only network access as an established SCTP association peer sending authenticated protocol traffic; no local Linux account, capability, or namespace privilege is needed on the victim host.\nUI:N - No victim user action is required beyond normal automated SCTP server/client operation; the attacker drives the entire trigger sequence with crafted SACK and ASCONF packets on the existing association.\nS:U - Impact is confined to kernel memory corruption and potential privilege escalation within the host kernel; it does not cross a VM, container, or IOMMU security boundary.\nC:H - KASAN reports a slab use-after-free read through dangling chunk-\u003etransport in sctp_check_transmitted(); UAF on sctp_transport objects can be groomed for arbitrary kernel memory disclosure.\nI:H - The UAF dereference performs flight_size arithmetic on a freed sctp_transport slab object, enabling heap grooming and arbitrary kernel write or control-flow hijack primitives typical of SCTP transport UAFs.\nA:H - Accessing freed transport memory during SACK processing can cause kernel oops/panic and repeatable remote denial of service against any SCTP endpoint handling the malicious peer traffic."
            }
          ]
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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          "url": "https://git.kernel.org/stable/c/5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749"
        }
      ],
      "title": "sctp: keep chunk-\u003etransport in step with the list it is queued on",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74588",
    "datePublished": "2026-08-22T15:31:40.466Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:15.097Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-74588",
      "date": "2026-10-14",
      "epss": "0.005",
      "percentile": "0.41315"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-25T02:10:28.000Z",
      "cve": "CVE-2026-74588",
      "id": "msrc_CVE-2026-74588",
      "initial_release_date": "2026-08-24T01:08:27.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sctp: keep chunk-\u003etransport in step with the list it is queued on",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74588.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
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                    "versionType": "original_commit_for_fix"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: keep chunk-\u003etransport in step with the list it is queued on\n\n__sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport\u0027s\ntransmitted list without updating chunk-\u003etransport:\n\n\tif (chunk-\u003etsn_gap_acked) {\n\t\tlist_move_tail(\u0026chunk-\u003etransmitted_list,\n\t\t\t       \u0026transport-\u003etransmitted);\n\t\tcontinue;\n\t}\n\nThe chunk then sits on a live transport\u0027s list while chunk-\u003etransport still\nnames a different one.  If that transport is removed - sctp_assoc_rm_peer()\nfrom an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk\nis left with a dangling pointer.  sctp_assoc_rm_peer() scrubs\npeer-\u003etransmitted and asoc-\u003eoutqueue.out_chunk_list, but the chunk is on\nneither.\n\nThe pointer is not followed while tsn_gap_acked is set.  A SACK that\nreneges on the TSN clears the flag, and the next SACK reaches\n\n\ttchunk-\u003etransport-\u003eflight_size -= sctp_data_size(tchunk);\n\ninside the freed transport.  KASAN reports a slab-use-after-free read in\nsctp_check_transmitted(), freed from sctp_assoc_rm_peer().  Both the\nremoval and the SACKs come from the association peer.\n\nSet chunk-\u003etransport at the move.  The ordinary resend path needs nothing:\nit reaches its list_move_tail() only after sctp_packet_append_chunk()\nreturned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the\nchunk by then.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsctp: mantener chunk -\u003e transport sincronizado con la lista en la que est\u00e1 en cola\n\n__sctp_outq_flush_rtx() mueve un chunk con acuse de recibo de brecha a la lista de transmitidos de otro transporte sin actualizar chunk -\u003e transport:\n\n\tif (chunk -\u003e tsn_gap_acked) {\n\t\tlist_move_tail(\u0026chunk -\u003e transmitted_list,\n\t\t\t       \u0026transport -\u003e transmitted);\n\t\tcontinue;\n\t}\n\nEl chunk entonces permanece en la lista de un transporte activo mientras chunk -\u003e transport todav\u00eda nombra a uno diferente. Si ese transporte es eliminado - sctp_assoc_rm_peer() de un ASCONF Delete-IP - sctp_transport_free() lo libera con RCU y el chunk queda con un puntero colgante. sctp_assoc_rm_peer() limpia peer -\u003e transmitted y asoc -\u003e outqueue.out_chunk_list, pero el chunk no est\u00e1 en ninguna de ellas.\n\nEl puntero no es seguido mientras tsn_gap_acked est\u00e1 establecido. Un SACK que revoca el TSN borra la bandera, y el siguiente SACK alcanza\n\n\ttchunk -\u003e transport -\u003e flight_size -= sctp_data_size(tchunk);\n\ndentro del transporte liberado. KASAN reporta una lectura de uso despu\u00e9s de liberaci\u00f3n de slab en sctp_check_transmitted(), liberado desde sctp_assoc_rm_peer(). Tanto la eliminaci\u00f3n como los SACK provienen del par de la asociaci\u00f3n.\n\nEstablecer chunk -\u003e transport en el movimiento. La ruta de reenv\u00edo ordinaria no necesita nada: alcanza su list_move_tail() solo despu\u00e9s de que sctp_packet_append_chunk() haya devuelto SCTP_XMIT_OK, y __sctp_packet_append_chunk() ya haya reasociado el chunk para entonces.\n\nDescubierto por XBOW, clasificado por Baul Lee \u003cbaul.lee@xbow.com\u003e"
          }
        ],
        "id": "CVE-2026-74588",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-22T16:16:30.960",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1adf929121e13e0b19200bb9fef715b918d483fe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6575fb17230814b48b471727c8410c0aadff9274"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6b9e2ea2057113f3393990ba646d2d97c719a80d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/874a7c2b5e184f06134fdfde27e9ce9271bafe58"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e2e7c1de0e226ca1b7fea2de57a6c9bca408709b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-28T17:17:34+00:00",
      "cve": "CVE-2026-74588",
      "id": "CVE-2026-74588",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: keep chunk-\u003etransport in step with the list it is queued on",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74588.json",
      "version": "3"
    }
  }
}



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