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FreeBSD Vulnerability Allow Attackers to Crash the Entire System

## Critical FreeBSD Vulnerability: CVE-2025-15576

IBy Iris EmersonFeb 27, 20262 min read

Critical FreeBSD Vulnerability: CVE-2025-15576

Administrators are advised to immediately address a critical vulnerability identified as CVE-2025-15576, which permits attackers to escape isolated jail environments. This flaw enables a jailed process to surpass its restricted environment and gain unauthorized access to the host’s underlying filesystem.

FreeBSD jails are a form of operating system virtualization designed to securely isolate processes using a chroot-like mechanism. The vulnerability arises from improper handling of directory file descriptors when two sibling jails interact, particularly under a specific system configuration involving shared directories via a nullfs mount.

Vulnerability ID: CVE-2025-15576 Vulnerability Type: Jail/chroot escape via file descriptor exchange across jails Affected Component: Core Jail Subsystem Disclosure Date: Tue, Feb 24, 2026 Affected Versions: FreeBSD 14.3, FreeBSD 13.5 Mitigation: No workaround available; patch required

Malicious processes can exploit this flaw to exchange directory descriptors through a Unix domain socket. During the normal filesystem name lookup process, the kernel fails to halt the lookup when directory descriptors are exchanged, allowing a process to access directories outside its restricted jail tree.

This flaw enables a jailed process to surpass its restricted environment and gain unauthorized access to the host’s underlying filesystem.
Iris Emerson · Thehackingpost

The primary impact of this vulnerability is the total loss of filesystem isolation, enabling attackers to gain full filesystem access. This access allows them to reach the root filesystem, modify critical system files, or exfiltrate sensitive data, potentially leading to further privilege escalation on the host machine.

Administrators must ensure unprivileged users cannot pass directory descriptors to jailed processes. Immediate upgrading to patched FreeBSD release branches is necessary to mitigate this vulnerability.

For systems installed from binary distribution sets (e.g., RELEASE versions of FreeBSD 14.3 or 13.5), administrators should use the built-in update utility. The commands freebsd-update fetch followed by freebsd-update install will apply the patch. A system reboot is strictly required for the security update to take effect.

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For source code installations, administrators must download the relevant patch from the official FreeBSD security portal, verify its PGP signature, and recompile the kernel. Ensure the system is running a patched kernel dated after Tue, Feb 24, 2026, for complete protection.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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