FKIE_CVE-2026-74688

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/associola.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "fad4766a74220fe579c6fcaa10ba01c23529814f",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "936658ec41c28c397ef390140e02d4c91ade92f0",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "8de65194a04d2552cd39b6c67d942d490f22d174",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "6160e756db81d6cb63e3e2952efcf6c5134be385",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "18d704bdd809377dfd81a3c2f42426763b5da227",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            },
            {
              "lessThan": "c9158ceaf27780ef64534ad72f44ffde3f8ccc49",
              "status": "affected",
              "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/associola.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.1"
            },
            {
              "lessThan": "3.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear control chunk transport if it is being removed\n\nsctp_make_heartbeat_ack() caches the destination transport in\nchunk-\u003etransport without taking a reference. When src_out_of_asoc_ok is\nenabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead\nof being transmitted immediately.\n\nIf the peer transport is removed while the chunk is still queued,\nsctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,\nbut only clears cached transport pointers in out_chunk_list.  The queued\ncontrol chunk therefore retains a dangling transport pointer.\n\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\nuse-after-free.\n\nFix this by also clearing chunk-\u003etransport for queued control chunks in\ncontrol_chunk_list when removing the transport."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsctp: borrar el transporte del fragmento de control si est\u00e1 siendo eliminado\n\nsctp_make_heartbeat_ack() almacena en cach\u00e9 el transporte de destino en chunk -\u003e transport sin tomar una referencia. Cuando src_out_of_asoc_ok est\u00e1 habilitado, el ACK de HEARTBEAT puede permanecer en cola en control_chunk_list en lugar de ser transmitido inmediatamente.\n\nSi el transporte del par es eliminado mientras el fragmento todav\u00eda est\u00e1 en cola, sctp_assoc_rm_peer() descarta el transporte y lo programa para liberaci\u00f3n RCU, pero solo borra los punteros de transporte almacenados en cach\u00e9 en out_chunk_list. El fragmento de control en cola, por lo tanto, retiene un puntero de transporte colgante.\n\nUna vez que un ASCONF_ACK borra la supresi\u00f3n y el fragmento de control en cola es transmitido, SCTP desreferencia el puntero de transporte obsoleto, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n.\n\nSolucione esto borrando tambi\u00e9n chunk -\u003e transport para los fragmentos de control en cola en control_chunk_list al eliminar el transporte."
    }
  ],
  "id": "CVE-2026-74688",
  "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": "2026-08-22T16:16:43.180",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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