The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable     error and free its response buffer. If SMB2_query_directory_init() fails before the next send, cleanup     retains the previous buffer type and frees that response again. Reset response bookkeeping before each     attempt to prevent the stale free. (CVE-2026-64387)

Note that Nessus relies on the presence of the package as reported by the vendor.

An update of the linux package has been released.

ID	Name	Product	Family	Published	Updated	Severity
329801	Linux Distros Unpatched Vulnerability : CVE-2026-64387	Nessus	Misc.	7/25/2026	7/29/2026	critical
329325	Photon OS 5.0: Linux PHSA-2026-5.0-0928	Nessus	PhotonOS Local Security Checks	7/24/2026	8/1/2026	medium

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critical

medium