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CVE-2026-101305

FreeBSD: Multiple jail filesystem root escapes

FreeBSD FreeBSDOperating systems
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.42%Chance of exploitation activity in the next 30 days, higher than 34% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published15 Oct 2026Updated 16 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 4

  • FreeBSDaffected: 15.1-RELEASE before p4CVE List
  • FreeBSDaffected: 15.0-RELEASE before p14CVE List
  • FreeBSDaffected: 14.5-RELEASE before p1CVE List
  • FreeBSDaffected: 14.4-RELEASE before p10CVE List

References 1