5.8 Medium

Tokio: Race condition in `tokio::time::Interval`

CVE-2026-115567

Summary On the multi-threaded runtime, there is a race condition between Interval::polltick 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::polltick (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…

Assessment

CVSS: 5.8 (v4.0)
Severity: Medium
EPSS: 0.00111% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 23 October 2026
Last updated: 23 October 2026
Affected: rust · tokio
Weakness: CWE-362

CVSS vectorCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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