CVE Catalog

CVE-2026-101306

CriticalCVSS 9.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.19%

8th percentile - higher than 8% of all known CVEs

Summary

SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.

Risk Assessment

A process in a jail can bypass filesystem restrictions and access resources outside its jail, breaking isolation and potentially leading to privilege escalation.

Recommendation

Update the system to a version containing the fix for this bug. Until the patch is applied, avoid passing directory file descriptors between jails.

Related vulnerabilities

Original NVD description (English source)

SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS