{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f"
            },
            {
              "fixed": "09dbd610f78aaed65d7b379c270ce4090a8151ac"
            },
            {
              "fixed": "21622e5ae8b232c2e64eb1adf5546cf078d2987d"
            },
            {
              "fixed": "7167afaaaee37191f8b6afa0c91e0fef41460705"
            },
            {
              "fixed": "7f796bb3b440d7f1b14c0e3b520462eb34f553af"
            },
            {
              "fixed": "da9c16568bc79140a54c1f5fcf07a0305df47b37"
            },
            {
              "fixed": "0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e"
            },
            {
              "fixed": "fb717c536af2aafeca520ff11d1e0f25f7ab8fa9"
            },
            {
              "fixed": "3acdd44385bc7e2e57605e073691ce69cc5a960d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.11.0"
            },
            {
              "fixed": "5.10.273"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.160"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99054.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: destroy topsrv workqueues before closing connections\n\ntipc_topsrv_stop() closed subscriber connections while the topology\nserver's send and receive workqueues were still running. Socket\ncallbacks and subscription events could then queue more work, and\nin-flight send/recv work could drop the last connection reference\nduring the conn_idr walk.\n\nThat race produced several teardown failures: refcount_t addition on\n0 from conn_get() on a connection whose release was blocked on\nidr_lock, a subsequent use-after-free in tipc_conn_close(),\nqueue_work() on an already destroyed workqueue from the listener\ndata-ready callback, and an RCU stall in tipc_topsrv_exit_net()\nwhile the walk spun under idr_lock.\n\nClear srv-\u003elistener under idr_lock so it acts as a shutdown flag,\nskip queue_work() once it is NULL, destroy the workqueues to flush\nin-flight work, and only then close the remaining connections.\nRefuse tipc_conn_lookup() after that flag is cleared, and drop\nidr_lock when the teardown walk finds no connection, so an\nin-flight subscription event cannot pin idr_in_use while the\nwalk holds the lock.\n\nv3 supersedes the narrower in-thread diff Tung Quang Nguyen\nposted on 2026-09-23. It keeps his teardown order and adds the\nlookup refusal and the empty-idr unlock.",
  "id": "CVE-2026-99054",
  "modified": "2026-11-01T02:30:34.333480185Z",
  "published": "2026-10-23T12:22:36.886Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99054.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99054"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tipc: destroy topsrv workqueues before closing connections"
}