Race condition in `tokio::time::Interval` on Tokio v1.54.0

{
  "id": "445fc8cd3f8fa805df41fd83c31f5f7ac095866552de132dc289b058f171cb26",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2026-0384",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Race condition in `tokio::time::Interval` on Tokio v1.54.0",
    "summary": "## Summary On the multi-threaded runtime, there is a race condition between `Interval::poll_tick` and the runtime's time driver. This affects `Interval` only. `Sleep` and `Timeout` are **not** affected. ## Details In Tokio v1.54.0, a race condition between `tokio::time::Interval::poll_tick` (including `.tick().await`) and the runtime time driver can drop an internal timer entry without synchronizing with the driver thread that is firing it. This causes a data race and use-after-free on the timer's waker and task state in safe Rust, leading to assertion panics, task reference-count corruption, or heap memory corruption. This bug was introduced by https://github.com/tokio-rs/tokio/pull/8458, and it was fixed by https://github.com/tokio-rs/tokio/pull/8692. ## Impact This may lead to crashes and use-after-frees in applications using `Interval` on a multi-threaded runtime. Since this issue is known to lead to crashes in production systems, the v1.54.0 release of Tokio has been yanked. ## Credits Thank you to [creepycode](https://github.com/ByteZ1337) and [carabistouille](https://github.com/carabistouflette) for reporting this privately using the procedure outlined in our security policy. They both reported the issue independently of each other.",
    "evidence": "osv:RUSTSEC-2026-0384",
    "products": [
      {
        "name": {
          "value": "tokio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.54.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "RUSTSEC-2026-0384",
      "aliases": [
        "CVE-2026-115567",
        "GHSA-5wjr-9356-4wc8",
        "RUSTSEC-2026-0384"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.54.0"
                },
                {
                  "fixed": "1.54.1"
                }
              ]
            }
          ],
          "package": {
            "name": "tokio",
            "purl": "pkg:cargo/tokio",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": null,
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0384.json",
            "categories": [
              "memory-corruption",
              "thread-safety"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-24T08:30:13Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/tokio",
        "https://rustsec.org/advisories/RUSTSEC-2026-0384.html",
        "https://github.com/tokio-rs/tokio/pull/8692"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-115567",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 428918,
  "published_at": "2026-10-21T12:00:00+00:00"
}