Linux Distros Unpatched Vulnerability : CVE-2026-45891

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_cve_id("CVE-2026-45891");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-45891");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix double free issue for
    tx spare buffer In hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure is created for
    rollback. However, the tx_spare pointer in the original ring handle is incorrectly left pointing to the
    old backup memory. Later, if memory allocation fails in hns3_init_all_ring() during the setup, the error
    path attempts to free all newly allocated rings. Since tx_spare contains a stale (non-NULL) pointer from
    the backup, it is mistaken for a newly allocated buffer and is erroneously freed, leading to a double-free
    of the backup memory. The root cause is that the tx_spare field was not cleared after its value was saved
    in tmp_rings, leaving a dangling pointer. Fix this by setting tx_spare to NULL in the original ring
    structure when the creation of the new `tx_spare` fails. This ensures the error cleanup path only frees
    genuinely newly allocated buffers. (CVE-2026-45891)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

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          {"reference": "kernel-zfcpdump"},
          {"reference": "kernel-zfcpdump-core"},
          {"reference": "kernel-zfcpdump-devel"},
          {"reference": "kernel-zfcpdump-devel-matched"},
          {"reference": "kernel-zfcpdump-modules"},
          {"reference": "kernel-zfcpdump-modules-core"},
          {"reference": "kernel-zfcpdump-modules-extra"},
          {"reference": "kernel-zfcpdump-modules-internal"},
          {"reference": "kernel-zfcpdump-modules-partner"},
          {"reference": "libperf"},
          {"reference": "libperf-devel"},
          {"reference": "perf"},
          {"reference": "python3-perf"},
          {"reference": "rtla"},
          {"reference": "rv"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}