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

  - iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d (iommu/vt-d: Avoid     use of NULL after WARN_ON_ONCE) fixed a NULL pointer dereference in an unlikely situation partly. If     dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are     executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain     was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when     checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a     valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0,     potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by     returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review     and suggested by Kevin Tian.
    https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com (CVE-2026-53281)

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

ID	Name	Product	Family	Published	Updated	Severity
323508	Linux Distros Unpatched Vulnerability : CVE-2026-53281	Nessus	Misc.	6/28/2026	9/1/2026	medium
340045	Ubuntu 26.04 LTS : Linux kernel (NVIDIA BaseOS) vulnerabilities (USN-8664-1)	Nessus	Ubuntu Local Security Checks	8/26/2026	8/26/2026	high

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