Linux Distros Unpatched Vulnerability : CVE-2024-26992

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

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if (description)
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  script_id(227792);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/06");

  script_cve_id("CVE-2024-26992");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-26992");

  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: KVM: x86/pmu: Disable support for
    adaptive PEBS Drop support for virtualizing adaptive PEBS, as KVM's implementation is architecturally
    broken without an obvious/easy path forward, and because exposing adaptive PEBS can leak host LBRs to the
    guest, i.e. can leak host kernel addresses to the guest. Bug #1 is that KVM doesn't account for the upper
    32 bits of IA32_FIXED_CTR_CTRL when (re)programming fixed counters, e.g fixed_ctrl_field() drops the upper
    bits, reprogram_fixed_counters() stores local variables as u8s and truncates the upper bits too, etc. Bug
    #2 is that, because KVM _always_ sets precise_ip to a non-zero value for PEBS events, perf will _always_
    generate an adaptive record, even if the guest requested a basic record. Note, KVM will also enable
    adaptive PEBS in individual *counter*, even if adaptive PEBS isn't exposed to the guest, but this is
    benign as MSR_PEBS_DATA_CFG is guaranteed to be zero, i.e. the guest will only ever see Basic records. Bug
    #3 is in perf. intel_pmu_disable_fixed() doesn't clear the upper bits either, i.e. leaves
    ICL_FIXED_0_ADAPTIVE set, and intel_pmu_enable_fixed() effectively doesn't clear ICL_FIXED_0_ADAPTIVE
    either. I.e. perf _always_ enables ADAPTIVE counters, regardless of what KVM requests. Bug #4 is that
    adaptive PEBS *might* effectively bypass event filters set by the host, as Updated Memory Access Info
    Group records information that might be disallowed by userspace via KVM_SET_PMU_EVENT_FILTER. Bug #5 is
    that KVM doesn't ensure LBR MSRs hold guest values (or at least zeros) when entering a vCPU with adaptive
    PEBS, which allows the guest to read host LBRs, i.e. host RIPs/addresses, by enabling LBR Entries
    records. Disable adaptive PEBS support as an immediate fix due to the severity of the LBR leak in
    particular, and because fixing all of the bugs will be non-trivial, e.g. not suitable for backporting to
    stable kernels. Note! This will break live migration, but trying to make KVM play nice with live migration
    would be quite complicated, wouldn't be guaranteed to work (i.e. KVM might still kill/confuse the guest),
    and it's not clear that there are any publicly available VMMs that support adaptive PEBS, let alone live
    migrate VMs that support adaptive PEBS, e.g. QEMU doesn't support PEBS in any capacity. (CVE-2024-26992)

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-2024-26992");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-26992");
  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:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-26992");

  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:"2024/04/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

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  script_category(ACT_GATHER_INFO);
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  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
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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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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
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  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
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      {
        "release": "18.04",
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          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}