{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a000c01e60e40e15304ffe48fff051d17a7bea91"
            },
            {
              "fixed": "10459b03e2d9ee12435e96f587de4d4cacdbf435"
            },
            {
              "fixed": "e1bb114e09372fd6e03387ced9ef566da336ed6c"
            },
            {
              "fixed": "179676f0166230c80053a392303485b37c93dd33"
            },
            {
              "fixed": "dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d"
            },
            {
              "fixed": "618b5c6d049896fcfabb91afc072954c92cb2693"
            },
            {
              "fixed": "07daf4f9750104960a1d60831b2353c0d41f35fb"
            },
            {
              "fixed": "d949992bc3f00027a2c755e860a11950c75f6073"
            },
            {
              "fixed": "8c283e7b56adce00193837f3311b06662466fb21"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "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-2026-74587.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix use-after-free of cached ASCONF chunk\n\naddip_last_asconf caches the outstanding outbound ASCONF chunk. The normal\nASCONF-ACK completion path releases the chunk and clears the pointer.\n\nHowever, sctp_asconf_queue_teardown() releases the cached chunk without\nclearing addip_last_asconf. During peer restart handling,\nsctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes\nsctp_asconf_queue_teardown() while the association remains alive and leaves\nthe pointer dangling.\n\nA delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(),\nwhich accesses the stale chunk and passes it to sctp_process_asconf_ack(),\ncausing a use-after-free and a second release.\n\nClearing the pointer exposes a race with T4 expiry. Peer restart handling\nqueues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses\ntimer_delete(), which does not wait for a callback already running on\nanother CPU. Such a callback can reach sctp_sf_t4_timer_expire() after\nthe purge and dereference NULL.\n\nClear addip_last_asconf after releasing the cached chunk, and make\nsctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding\nASCONF remains.",
  "id": "CVE-2026-74587",
  "modified": "2026-08-24T11:36:10.521156518Z",
  "published": "2026-08-22T15:31:39.810Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07daf4f9750104960a1d60831b2353c0d41f35fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74587.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74587"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "sctp: fix use-after-free of cached ASCONF chunk"
}