North

**Name of the Vulnerable Software and Affected Versions** Plan 9 kernel (affected versions not specified) **Description** The issue is related to an integer overflow in the `envwrite` function, which allows local users to overwrite certain memory addresses with kernel memory by providing a large `n` argument. This can be exploited in various ways, such as modifying the `iseve` function to gain privileges or making the `devpermcheck` function grant unrestricted device permissions. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.