{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "6575fb17230814b48b471727c8410c0aadff9274"
            },
            {
              "fixed": "6b9e2ea2057113f3393990ba646d2d97c719a80d"
            },
            {
              "fixed": "874a7c2b5e184f06134fdfde27e9ce9271bafe58"
            },
            {
              "fixed": "1adf929121e13e0b19200bb9fef715b918d483fe"
            },
            {
              "fixed": "e2e7c1de0e226ca1b7fea2de57a6c9bca408709b"
            },
            {
              "fixed": "2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d"
            },
            {
              "fixed": "5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b"
            },
            {
              "fixed": "9f2cf069a9a72a2d6b97ca8b4c70e714aac99749"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "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-2026-74588.json"
  },
  "details": "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's\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's 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",
  "id": "CVE-2026-74588",
  "modified": "2026-08-24T11:36:03.679852655Z",
  "published": "2026-08-22T15:31:40.466Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1adf929121e13e0b19200bb9fef715b918d483fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6575fb17230814b48b471727c8410c0aadff9274"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b9e2ea2057113f3393990ba646d2d97c719a80d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/874a7c2b5e184f06134fdfde27e9ce9271bafe58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2e7c1de0e226ca1b7fea2de57a6c9bca408709b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74588.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74588"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "sctp: keep chunk-\u003etransport in step with the list it is queued on"
}