Linux Distros Unpatched Vulnerability : CVE-2023-53024

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

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if (description)
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  script_id(248708);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2023-53024");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-53024");

  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: bpf: Fix pointer-leak due to
    insufficient speculative store bypass mitigation To mitigate Spectre v4, 2039f26f3aca (bpf: Fix leakage
    due to insufficient speculative store bypass mitigation) inserts lfence instructions after 1)
    initializing a stack slot and 2) spilling a pointer to the stack. However, this does not cover cases where
    a stack slot is first initialized with a pointer (subject to sanitization) but then overwritten with a
    scalar (not subject to sanitization because the slot was already initialized). In this case, the second
    write may be subject to speculative store bypass (SSB) creating a speculative pointer-as-scalar type
    confusion. This allows the program to subsequently leak the numerical pointer value using, for example, a
    branch-based cache side channel. To fix this, also sanitize scalars if they write a stack slot that
    previously contained a pointer. Assuming that pointer-spills are only generated by LLVM on register-
    pressure, the performance impact on most real-world BPF programs should be small. The following
    unprivileged BPF bytecode drafts a minimal exploit and the mitigation: [...] // r6 = 0 or 1 (skalar,
    unknown user input) // r7 = accessible ptr for side channel // r10 = frame pointer (fp), to be leaked //
    r9 = r10 # fp alias to encourage ssb *(u64 *)(r9 - 8) = r10 // fp[-8] = ptr, to be leaked // lfence added
    here because of pointer spill to stack. // // Ommitted: Dummy bpf_ringbuf_output() here to train alias
    predictor // for no r9-r10 dependency. // *(u64 *)(r10 - 8) = r6 // fp[-8] = scalar, overwrites ptr //
    2039f26f3aca: no lfence added because stack slot was not STACK_INVALID, // store may be subject to SSB //
    // fix: also add an lfence when the slot contained a ptr // r8 = *(u64 *)(r9 - 8) // r8 = architecturally
    a scalar, speculatively a ptr // // leak ptr using branch-based cache side channel: r8 &= 1 // choose bit
    to leak if r8 == 0 goto SLOW // no mispredict // architecturally dead code if input r6 is 0, // only
    executes speculatively iff ptr bit is 1 r8 = *(u64 *)(r7 + 0) # encode bit in cache (0: slow, 1: fast)
    SLOW: [...] After running this, the program can time the access to *(r7 + 0) to determine whether the
    chosen pointer bit was 0 or 1. Repeat this 64 times to recover the whole address on amd64. In summary,
    sanitization can only be skipped if one scalar is overwritten with another scalar. Scalar-confusion due to
    speculative store bypass can not lead to invalid accesses because the pointer bounds deducted during
    verification are enforced using branchless logic. See 979d63d50c0c (bpf: prevent out of bounds
    speculation on pointer arithmetic) for details. Do not make the mitigation depend on
    !env->allow_{uninit_stack,ptr_leaks} because speculative leaks are likely unexpected if these were
    enabled. For example, leaking the address to a protected log file may be acceptable while disabling the
    mitigation might unintentionally leak the address into the cached-state of a map that is accessible to
    unprivileged processes. (CVE-2023-53024)

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-2023-53024");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-53024");
  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:P/I:N/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:H/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-2023-53024");

  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:"2023/02/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/12");

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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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        "pkgs": [
          {"reference": "linux-hwe-edge"}
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          {"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');
}