Tails 7.8.1 has been released as an emergency security update for the privacy-focused Linux distribution, addressing a Linux kernel vulnerability and multiple security issues in the Tor client.
According to the project, version 7.8.1 fixes a serious Linux kernel vulnerability, CVE-2026-43503, that could allow an application inside Tails to gain administrative privileges. This risk is especially relevant for a system designed for anonymity and session isolation.
Tails explains that if an attacker exploited another unknown vulnerability in a Tails application, the kernel flaw could be used to take full control of the session and potentially deanonymize the user.
The project stresses that such an attack is unlikely and would require a strong attacker, such as a government or hacking firm. It also says it is not aware of the vulnerability being used in practice.
To address the issue, Tails 7.8.1 updates the Linux kernel to version 6.12.90-2. The release also updates the Tor client to 0.4.9.9, which fixes several Tor security vulnerabilities.
For additional details, refer to the changelog or the release announcement.
Automatic upgrades are available from Tails 7.0 or later to Tails 7.8.1. Users who cannot complete the automatic upgrade, or whose system fails to start afterward, are advised to perform a manual upgrade instead.
The project also notes that users installing Tails 7.8.1 on a new USB stick ought to follow the installation instructions, but warns that Persistent Storage on the USB stick will be lost if they install instead of upgrading.
