{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef"
            },
            {
              "fixed": "dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886"
            },
            {
              "fixed": "fad4766a74220fe579c6fcaa10ba01c23529814f"
            },
            {
              "fixed": "936658ec41c28c397ef390140e02d4c91ade92f0"
            },
            {
              "fixed": "8de65194a04d2552cd39b6c67d942d490f22d174"
            },
            {
              "fixed": "6160e756db81d6cb63e3e2952efcf6c5134be385"
            },
            {
              "fixed": "18d704bdd809377dfd81a3c2f42426763b5da227"
            },
            {
              "fixed": "4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7"
            },
            {
              "fixed": "c9158ceaf27780ef64534ad72f44ffde3f8ccc49"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.152"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.104"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74688.json"
  },
  "details": "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.",
  "id": "CVE-2026-74688",
  "modified": "2026-08-27T11:30:45.896268029Z",
  "published": "2026-08-22T15:32:53.423Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74688.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74688"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sctp: clear control chunk transport if it is being removed"
}