Linux Distros Unpatched Vulnerability : CVE-2025-37865

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

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  script_version("1.22");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2025-37865");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-37865");

  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: dsa: mv88e6xxx: fix -ENOENT when
    deleting VLANs and MST is unsupported Russell King reports that on the ZII dev rev B, deleting a bridge
    VLAN from a user port fails with -ENOENT:
    https://lore.kernel.org/netdev/[email protected]/ This comes from
    mv88e6xxx_port_vlan_leave() -> mv88e6xxx_mst_put(), which tries to find an MST entry in &chip->msts
    associated with the SID, but fails and returns -ENOENT as such. But we know that this chip does not
    support MST at all, so that is not surprising. The question is why does the guard in mv88e6xxx_mst_put()
    not exit early: if (!sid) return 0; And the answer seems to be simple: the sid comes from vlan.sid which
    supposedly was previously populated by mv88e6xxx_vtu_get(). But some chip->info->ops->vtu_getnext()
    implementations do not populate vlan.sid, for example see mv88e6185_g1_vtu_getnext(). In that case, later
    in mv88e6xxx_port_vlan_leave() we are using a garbage sid which is just residual stack memory. Testing for
    sid == 0 covers all cases of a non-bridge VLAN or a bridge VLAN mapped to the default MSTI. For some
    chips, SID 0 is valid and installed by mv88e6xxx_stu_setup(). A chip which does not support the STU would
    implicitly only support mapping all VLANs to the default MSTI, so although SID 0 is not valid, it would be
    sufficient, if we were to zero-initialize the vlan structure, to fix the bug, due to the coincidence that
    a test for vlan.sid == 0 already exists and leads to the same (correct) behavior. Another option which
    would be sufficient would be to add a test for mv88e6xxx_has_stu() inside mv88e6xxx_mst_put(), symmetric
    to the one which already exists in mv88e6xxx_mst_get(). But that placement means the caller will have to
    dereference vlan.sid, which means it will access uninitialized memory, which is not nice even if it
    ignores it later. So we end up making both modifications, in order to not rely just on the sid == 0
    coincidence, but also to avoid having uninitialized structure fields which might get temporarily accessed.
    (CVE-2025-37865)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-37865");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-37865");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/08");

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if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
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          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "linux-azure-fde"}
        ]
      }
    ]
  }
};

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');
}