CVE-2005-4351: The securelevels implementation in FreeBSD 7.0 and earlier, OpenBSD up to 3.8, DragonFly up to 1.2, and Lin...

Security readout for executives and security teams

This issue weakens a legacy integrity control: a root user can bypass immutable file protections by masking protected files with another mounted filesystem. It is not described as a remote entry point. Its business impact is highest where old BSD/Linux systems depend on immutable flags to protect critical files after root compromise. Exposure is mainly legacy infrastructure running the listed BSD or Linux versions, especially systems that still rely on securelevels or immutable file flags as a hardening layer. Modern supported systems are not identified as affected in the provided bundle. Treat this as a legacy hardening gap. It is not evidenced as actively exploited or remotely reachable, but it matters if older systems rely on immutable files to contain damage after root compromise. Mitigation focus: Inventory systems for the affected OS families and version ranges.; Check current vendor guidance for patches, advisories, or configuration recommendations.; Migrate affected legacy systems to supported operating system versions..

Prepared

Jun 29, 2026, 15:20 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.