CVE-2017-7794

CVE-2017-7794 describes a high-severity vulnerability affecting Firefox versions prior to 55 on Linux systems. If a content process is compromised, the sandbox broker incorrectly permits file truncation despite explicit read-only sandbox permissions, allowing an attacker to modify files on the local filesystem. This local attack vector has low complexity and can lead to high impact on confidentiality, integrity, and availability. There is no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this vulnerability.