Linux Distros Unpatched Vulnerability : CVE-2024-50200

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

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  script_id(230868);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/03");

  script_cve_id("CVE-2024-50200");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-50200");

  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: maple_tree: correct tree corruption on
    spanning store Patch series maple_tree: correct tree corruption on spanning store, v3. There has been a
    nasty yet subtle maple tree corruption bug that appears to have been in existence since the inception of
    the algorithm. This bug seems far more likely to happen since commit f8d112a4e657 (mm/mmap: avoid zeroing
    vma tree in mmap_region()), which is the point at which reports started to be submitted concerning this
    bug. We were made definitely aware of the bug thanks to the kind efforts of Bert Karwatzki who helped
    enormously in my being able to track this down and identify the cause of it. The bug arises when an
    attempt is made to perform a spanning store across two leaf nodes, where the right leaf node is the
    rightmost child of the shared parent, AND the store completely consumes the right-mode node. This results
    in mas_wr_spanning_store() mitakenly duplicating the new and existing entries at the maximum pivot within
    the range, and thus maple tree corruption. The fix patch corrects this by detecting this scenario and
    disallowing the mistaken duplicate copy. The fix patch commit message goes into great detail as to how
    this occurs. This series also includes a test which reliably reproduces the issue, and asserts that the
    fix works correctly. Bert has kindly tested the fix and confirmed it resolved his issues. Also Mikhail
    Gavrilov kindly reported what appears to be precisely the same bug, which this fix should also resolve.
    This patch (of 2): There has been a subtle bug present in the maple tree implementation from its
    inception. This arises from how stores are performed - when a store occurs, it will overwrite overlapping
    ranges and adjust the tree as necessary to accommodate this. A range may always ultimately span two leaf
    nodes. In this instance we walk the two leaf nodes, determine which elements are not overwritten to the
    left and to the right of the start and end of the ranges respectively and then rebalance the tree to
    contain these entries and the newly inserted one. This kind of store is dubbed a 'spanning store' and is
    implemented by mas_wr_spanning_store(). In order to reach this stage, mas_store_gfp() invokes
    mas_wr_preallocate(), mas_wr_store_type() and mas_wr_walk() in turn to walk the tree and update the object
    (mas) to traverse to the location where the write should be performed, determining its store type. When a
    spanning store is required, this function returns false stopping at the parent node which contains the
    target range, and mas_wr_store_type() marks the mas->store_type as wr_spanning_store to denote this fact.
    When we go to perform the store in mas_wr_spanning_store(), we first determine the elements AFTER the END
    of the range we wish to store (that is, to the right of the entry to be inserted) - we do this by walking
    to the NEXT pivot in the tree (i.e. r_mas.last + 1), starting at the node we have just determined contains
    the range over which we intend to write. We then turn our attention to the entries to the left of the
    entry we are inserting, whose state is represented by l_mas, and copy these into a 'big node', which is a
    special node which contains enough slots to contain two leaf node's worth of data. We then copy the entry
    we wish to store immediately after this - the copy and the insertion of the new entry is performed by
    mas_store_b_node(). After this we copy the elements to the right of the end of the range which we are
    inserting, if we have not exceeded the length of the node (i.e. r_mas.offset <= r_mas.end). Herein lies
    the bug - under very specific circumstances, this logic can break and corrupt the maple tree. Consider the
    following tree: Height 0 Root Node / \ pivot = 0xffff / \ pivot = ULONG_MAX / ---truncated---
    (CVE-2024-50200)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2024-50200");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-50200");
  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:M/Au:N/C:C/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-2024-50200");

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  script_set_attribute(attribute:"vuln_publication_date", value:"2024/11/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/06");

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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")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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          {"reference": "linux-oem-5.17-headers-5.17.0"},
          {"reference": "linux-oem-5.17-tools-5.17.0"},
          {"reference": "linux-oem-5.17-tools-host"},
          {"reference": "linux-oem-6.0"},
          {"reference": "linux-oem-6.1"},
          {"reference": "linux-oem-6.5"},
          {"reference": "linux-oracle-6.5"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "linux-azure-fde"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "kernel-rt"},
          {"reference": "kernel-rt-core"},
          {"reference": "kernel-rt-debug"},
          {"reference": "kernel-rt-debug-core"},
          {"reference": "kernel-rt-debug-devel"},
          {"reference": "kernel-rt-debug-devel-matched"},
          {"reference": "kernel-rt-debug-kvm"},
          {"reference": "kernel-rt-debug-modules"},
          {"reference": "kernel-rt-debug-modules-core"},
          {"reference": "kernel-rt-debug-modules-extra"},
          {"reference": "kernel-rt-debug-modules-internal"},
          {"reference": "kernel-rt-debug-modules-partner"},
          {"reference": "kernel-rt-devel"},
          {"reference": "kernel-rt-devel-matched"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-rt-modules-internal"},
          {"reference": "kernel-rt-modules-partner"},
          {"reference": "kernel-rt-selftests-internal"}
        ]
      }
    ]
  }
};

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');
}