CVE-2026-64388

CVE CVE-2026-64388EUVD EUVD-2026-48932Published 2026-07-25T08:50:36.000ZLast changed 2026-08-05T12:41:25.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp with SMB3 POSIX Extensions Ownership (chown) and group (chgrp) modifications were being ignored when mounting with SMB3 POSIX Extensions unless CIFS_MOUNT_CIFS_ACL or CIFS_MOUNT_MODE_FROM_SID were also explicitly set. Fix this by checking for posix_extensions in cifs_setattr_nounix() when updating UID and GID, ensuring that id_mode_to_cifs_acl() is called to map and set the ownership/group information on the server.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux b326614ea2159ea5c835d320f261d05d080cd201 <760ef2c579c2609cf17fb1cd5392f64d42d43d33; b326614ea2159ea5c835d320f261d05d080cd201 <550cfb8a81181331d4d0f76ab75ee58a0bf41e3e; patch: 7.1.4; patch: 0; 4.18; patch: 7.2-rc1

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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