Vulnerability · Published Oct 23, 2026 · Assigned by GitHub_M

CVE-2026-115567Tokio: Race condition in `tokio::time::Interval`

Medium 5.8

In plain English

A medium-severity race condition in tokio from tokio-rs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 4.0)5.8Medium

Exploit odds (30 days)0.1%top 98.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Tokio is a runtime for writing applications with Rust. In 1.54.0, a race condition between tokio::time::Interval::poll_tick (including .tick().await) and the multi-threaded runtime's time driver could drop an internal timer entry without synchronizing with the driver thread that was firing it. The race caused a use-after-free on the timer's waker and task state in safe Rust, which could produce assertion panics, task reference-count corruption, or heap memory corruption. This issue is fixed in 1.54.1.

Affected products (as reported)

Vendor	Product	Versions
tokio-rs	tokio	= 1.54.0

Weakness: CWE-362 · Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

References

https://github.com/tokio-rs/tokio/security/advisories/GHSA-5wjr-9356-4wc8 x_refsource_CONFIRM
https://github.com/tokio-rs/tokio/pull/8458 x_refsource_MISC
https://github.com/tokio-rs/tokio/pull/8692 x_refsource_MISC
https://github.com/tokio-rs/tokio/commit/2b4eba7833864c04ecd2f3e5f4a97ff4f6fa28d0 x_refsource_MISC
https://github.com/tokio-rs/tokio/commit/5ed619bbaba87357ee5103d71b75e7c84cad99c9 x_refsource_MISC
https://github.com/tokio-rs/tokio/releases/tag/tokio-1.54.1 x_refsource_MISC