CVE-2024-27308: Mio is a Metal I/O library for Rust

This month

HIGH 7.5REMOTEUPGRADEDOWNGRADE

CVE-2024-27308 is a high-severity flaw (CVSS 7.5) affecting mio, tokio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mio is a Metal I/O library for Rust. When using named pipes on Windows, mio will under some circumstances return invalid tokens that correspond to named pipes that have already been deregistered from the mio registry. The impact of this vulnerability depends on how mio is used. For some applications, invalid tokens may be ignored or cause a warning or a crash. On the other hand, for applications that store pointers in the tokens, this vulnerabili

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-416, CWE-672
Published	2024-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mio project · tokio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-03-06 20:15 UTCPublished CVE record published
2026-06-17 07:19 UTCUpdated Record last modified

mio project mio UPGRADE

Affected: >= 0.7.2 and <= 0.8.10

Fixed in: newer than 0.8.10

Safe to downgrade to: a release before 0.7.2

1. Check installed version

apt-cache policy mio || rpm -q mio || mio --version

2. UPGRADE to newer than 0.8.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.7.2 (Debian / Ubuntu)

apt-cache madison mio sudo apt install mio=<VERSION_BEFORE_0.7.2> sudo apt-mark hold mio

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mio sudo dnf downgrade mio-<VERSION_BEFORE_0.7.2> sudo dnf versionlock add mio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

tokio tokio DOWNGRADE

Affected: >= 1.30.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.30.0

1. Check installed version

apt-cache policy tokio || rpm -q tokio || tokio --version

2. No fixed release: DOWNGRADE to a release before 1.30.0 (Debian / Ubuntu)

apt-cache madison tokio sudo apt install tokio=<VERSION_BEFORE_1.30.0> sudo apt-mark hold tokio

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tokio sudo dnf downgrade tokio-<VERSION_BEFORE_1.30.0> sudo dnf versionlock add tokio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-27308?

mio: upgrade to newer than 0.8.10; tokio: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-27308 being exploited?

CVE-2024-27308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-27308 affect?

CVE-2024-27308 affects mio, tokio. Severity is high (CVSS 7.5). Mio is a Metal I/O library for Rust. When using named pipes on Windows, mio will under some circumstances return invalid tokens that correspond to named pipes that have already been deregistered from the mio registry. The impact of this vul

How urgent is CVE-2024-27308?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities

References

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