Linux Distros Unpatched Vulnerability : CVE-2023-52934

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

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  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/27");

  script_cve_id("CVE-2023-52934");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-52934");

  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: mm/MADV_COLLAPSE: catch !none !huge
    !bad pmd lookups In commit 34488399fa08 (mm/madvise: add file and shmem support to MADV_COLLAPSE) we
    make the following change to find_pmd_or_thp_or_none(): - if (!pmd_present(pmde)) - return SCAN_PMD_NULL;
    + if (pmd_none(pmde)) + return SCAN_PMD_NONE; This was for-use by MADV_COLLAPSE file/shmem codepaths,
    where MADV_COLLAPSE might identify a pte-mapped hugepage, only to have khugepaged race-in, free the pte
    table, and clear the pmd. Such codepaths include: A) If we find a suitably-aligned compound page of order
    HPAGE_PMD_ORDER already in the pagecache. B) In retract_page_tables(), if we fail to grab mmap_lock for
    the target mm/address. In these cases, collapse_pte_mapped_thp() really does expect a none (not just
    !present) pmd, and we want to suitably identify that case separate from the case where no pmd is found, or
    it's a bad-pmd (of course, many things could happen once we drop mmap_lock, and the pmd could plausibly
    undergo multiple transitions due to intervening fault, split, etc). Regardless, the code is prepared
    install a huge-pmd only when the existing pmd entry is either a genuine pte-table-mapping-pmd, or the
    none-pmd. However, the commit introduces a logical hole; namely, that we've allowed !none- && !huge- &&
    !bad-pmds to be classified as genuine pte-table-mapping-pmds. One such example that could leak through are
    swap entries. The pmd values aren't checked again before use in pte_offset_map_lock(), which is expecting
    nothing less than a genuine pte-table-mapping-pmd. We want to put back the !pmd_present() check (below the
    pmd_none() check), but need to be careful to deal with subtleties in pmd transitions and treatments by
    various arch. The issue is that __split_huge_pmd_locked() temporarily clears the present bit (or otherwise
    marks the entry as invalid), but pmd_present() and pmd_trans_huge() still need to return true while the
    pmd is in this transitory state. For example, x86's pmd_present() also checks the _PAGE_PSE , riscv's
    version also checks the _PAGE_LEAF bit, and arm64 also checks a PMD_PRESENT_INVALID bit. Covering all 4
    cases for x86 (all checks done on the same pmd value): 1) pmd_present() && pmd_trans_huge() All we
    actually know here is that the PSE bit is set. Either: a) We aren't racing with __split_huge_page(), and
    PRESENT or PROTNONE is set. => huge-pmd b) We are currently racing with __split_huge_page(). The danger
    here is that we proceed as-if we have a huge-pmd, but really we are looking at a pte-mapping-pmd. So, what
    is the risk of this danger? The only relevant path is: madvise_collapse() -> collapse_pte_mapped_thp()
    Where we might just incorrectly report back success, when really the memory isn't pmd-backed. This is
    fine, since split could happen immediately after (actually) successful madvise_collapse(). So, it should
    be safe to just assume huge-pmd here. 2) pmd_present() && !pmd_trans_huge() Either: a) PSE not set and
    either PRESENT or PROTNONE is. => pte-table-mapping pmd (or PROT_NONE) b) devmap. This routine can be
    called immediately after unlocking/locking mmap_lock -- or called with no locks held (see
    khugepaged_scan_mm_slot()), so previous VMA checks have since been invalidated. 3) !pmd_present() &&
    pmd_trans_huge() Not possible. 4) !pmd_present() && !pmd_trans_huge() Neither PRESENT nor PROTNONE set =>
    not present I've checked all archs that implement pmd_trans_huge() (arm64, riscv, powerpc, longarch, x86,
    mips, s390) and this logic roughly translates (though devmap treatment is unique to x86 and powerpc, and
    (3) doesn't necessarily hold in general -- but that doesn't matter since !pmd_present() always takes
    failure path). Also, add a comment above find_pmd_or_thp_or_none() ---truncated--- (CVE-2023-52934)

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-2023-52934");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-52934");
  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: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:H/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-2023-52934");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/03/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/05");

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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');

var distro_constraints_array = {
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        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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          {"reference": "linux-headers-5.17.0"},
          {"reference": "linux-hwe-5.19"},
          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
          {"reference": "linux-image-5.15.0"},
          {"reference": "linux-image-unsigned-5.17.0"},
          {"reference": "linux-intel-iot-realtime"},
          {"reference": "linux-lowlatency-hwe-5.19"},
          {"reference": "linux-lowlatency-hwe-6.2"},
          {"reference": "linux-lowlatency-hwe-6.5"},
          {"reference": "linux-modules-5.15.0"},
          {"reference": "linux-modules-5.17.0"},
          {"reference": "linux-modules-extra-5.15.0"},
          {"reference": "linux-modules-extra-5.17.0"},
          {"reference": "linux-nvidia-6.2"},
          {"reference": "linux-nvidia-6.5"},
          {"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"}
        ]
      }
    ]
  },
  "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');
}