Samba: missing access check on reparse point operations

Summary

A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types.

Timeline

1. May 27, 2026, 12:28 PM UTCCVE published
2. May 27, 2026, 2:40 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 8, 2026, 8:43 PM UTCRecord last updated

Affected versions

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• samba

  Version range not reported

• openshift/ose-rhel-coreos-8

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• samba

  Version range not reported

• samba4

  Version range not reported

• samba

  Version range not reported

References 23