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

  - ksmbd: validate inherited ACE SID length smb_inherit_dacl() walks the parent directory DACL loaded from     the security descriptor xattr. It verifies that each ACE contains the fixed SID header before using it,     but does not verify that the variable-length SID described by sid.num_subauth is fully contained in the     ACE. A malformed inheritable ACE can advertise more subauthorities than are present in the ACE.
    compare_sids() may then read past the ACE. smb_set_ace() also clamps the copied destination SID, but used     the unchecked source SID count to compute the inherited ACE size. That could advance the temporary     inherited ACE buffer pointer and nt_size accounting past the allocated buffer. Fix this by validating the     parent ACE SID count and SID length before using the SID during inheritance. Compute the inherited ACE     size from the copied SID so the size matches the bounded destination SID. Reject the inherited DACL if     size accumulation would overflow smb_acl.size or the security descriptor allocation size. (CVE-2026-43490)

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

Detections

Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-43490

high Nessus Plugin ID 314946

Version 1.7

Version 1.6

Version 1.3

Version 1.2

Version 1.1

Version 1.7 May 29, 2026, 5:27 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605291727
Version 1.6 May 25, 2026, 10:30 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605252230
Version 1.3 May 17, 2026, 4:48 PM CVSS metrics ("CVSSv2 score" set to 5.6) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:P") CVSS metrics ("CVSSv3 score" set to 7.1) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H") CVSSv2 severity (based on CVE-2026-43490, severity decreased from "High" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202605171648
Version 1.2 May 16, 2026, 9:07 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605160907
Version 1.1 May 15, 2026, 6:15 PM New Plugin Feed: 202605151815