CVE Catalog

CVE-2026-101305

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.18%

7th percentile - higher than 7% of all known CVEs

Summary

renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root.

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)

renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. 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