Linux Distros Unpatched Vulnerability : CVE-2022-49236

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

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  script_id(225146);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/17");

  script_cve_id("CVE-2022-49236");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-49236");

  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 UAF due to race between
    btf_try_get_module and load_module While working on code to populate kfunc BTF ID sets for module BTF from
    its initcall, I noticed that by the time the initcall is invoked, the module BTF can already be seen by
    userspace (and the BPF verifier). The existing btf_try_get_module calls try_module_get which only fails if
    mod->state == MODULE_STATE_GOING, i.e. it can increment module reference when module initcall is happening
    in parallel. Currently, BTF parsing happens from MODULE_STATE_COMING notifier callback. At this point, the
    module initcalls have not been invoked. The notifier callback parses and prepares the module BTF,
    allocates an ID, which publishes it to userspace, and then adds it to the btf_modules list allowing the
    kernel to invoke btf_try_get_module for the BTF. However, at this point, the module has not been fully
    initialized (i.e. its initcalls have not finished). The code in module.c can still fail and free the
    module, without caring for other users. However, nothing stops btf_try_get_module from succeeding between
    the state transition from MODULE_STATE_COMING to MODULE_STATE_LIVE. This leads to a use-after-free issue
    when BPF program loads successfully in the state transition, load_module's do_init_module call fails and
    frees the module, and BPF program fd on close calls module_put for the freed module. Future patch has test
    case to verify we don't regress in this area in future. There are multiple points after
    prepare_coming_module (in load_module) where failure can occur and module loading can return error. We
    illustrate and test for the race using the last point where it can practically occur (in module __init
    function). An illustration of the race: CPU 0 CPU 1 load_module notifier_call(MODULE_STATE_COMING)
    btf_parse_module btf_alloc_id // Published to userspace list_add(&btf_mod->list, btf_modules)
    mod->init(...) ... ^ bpf_check | check_pseudo_btf_id | btf_try_get_module | returns true | ... ... |
    module __init in progress return prog_fd | ... ... V if (ret < 0) free_module(mod) ... close(prog_fd) ...
    bpf_prog_free_deferred module_put(used_btf.mod) // use-after-free We fix this issue by setting a flag
    BTF_MODULE_F_LIVE, from the notifier callback when MODULE_STATE_LIVE state is reached for the module, so
    that we return NULL from btf_try_get_module for modules that are not fully formed. Since try_module_get
    already checks that module is not in MODULE_STATE_GOING state, and that is the only transition a live
    module can make before being removed from btf_modules list, this is enough to close the race and prevent
    the bug. A later selftest patch crafts the race condition artifically to verify that it has been fixed,
    and that verifier fails to load program (with ENXIO). Lastly, a couple of comments: 1. Even if this race
    didn't exist, it seems more appropriate to only access resources (ksyms and kfuncs) of a fully formed
    module which has been initialized completely. 2. This patch was born out of need for synchronization
    against module initcall for the next patch, so it is needed for correctness even without the
    aforementioned race condition. The BTF resources initialized by module initcall are set up once and then
    only looked up, so just waiting until the initcall has finished ensures correct behavior. (CVE-2022-49236)

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-2022-49236");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2022-49236");
  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:H/Au:N/C:C/I:C/A:C");
  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:H/I:H/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-2022-49236");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/02/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

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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');

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          {"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"}
        ]
      }
    ]
  },
  "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');
}