```toml
[advisory]
id = "CVE-2018-25008"
package = "std"
categories = ["thread-safety"]
date = "2018-06-25"
url = "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-25008"

[versions]
patched = [">= 1.29.0"]
unaffected = ["< 1.3.0"]
```

# Insufficient synchronization in `Arc::get_mut`

In the standard library in Rust before 1.29.0, there is weak synchronization in the Arc::get_mut method. This synchronization issue can be lead to memory safety issues through race conditions.