RHEL 9 : Backport fixes for CVE-2026-64835 and CVE-2026-58049 (Important) (RHSA-2026:51180)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:51180. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(333119);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/06");

  script_cve_id("CVE-2026-58049", "CVE-2026-64835");
  script_xref(name:"RHSA", value:"2026:51180");

  script_name(english:"RHEL 9 : Backport fixes for CVE-2026-64835 and CVE-2026-58049 (Important) (RHSA-2026:51180)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:51180 advisory.

    CVE-2026-64835 FFmpeg: Arbitrary code execution, information disclosure, or denial of service via crafted
    ADX/AAX audio files
    CVE-2026-58049 FFmpeg: Memory corruption via crafted RASC video stream

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_51180.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dba06c28");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:51180");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-64835");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-58049");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(125, 787);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ffmpeg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ffmpeg-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ffmpeg-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavcodec-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavcodec-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavdevice-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavdevice-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavfilter-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavfilter-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavformat-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavformat-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavutil-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libavutil-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libpostproc-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libpostproc-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libswresample-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libswresample-free-rhai-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libswscale-free-rhai");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libswscale-free-rhai-devel");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'ge', os_version: os_version, rhel_version: '9')) audit(AUDIT_OS_NOT, 'Red Hat 9.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'release': '9',
    'repo_relative_urls': [
      'content/dist/layered/rhel9/aarch64/rhelai-cuda/3.3/debug',
      'content/dist/layered/rhel9/aarch64/rhelai-cuda/3.3/os',
      'content/dist/layered/rhel9/aarch64/rhelai-cuda/3.3/source/SRPMS',
      'content/dist/layered/rhel9/aarch64/rhelai/3.3/debug',
      'content/dist/layered/rhel9/aarch64/rhelai/3.3/os',
      'content/dist/layered/rhel9/aarch64/rhelai/3.3/source/SRPMS',
      'content/dist/layered/rhel9/ppc64le/rhelai/3.3/debug',
      'content/dist/layered/rhel9/ppc64le/rhelai/3.3/os',
      'content/dist/layered/rhel9/ppc64le/rhelai/3.3/source/SRPMS',
      'content/dist/layered/rhel9/s390x/rhelai/3.3/debug',
      'content/dist/layered/rhel9/s390x/rhelai/3.3/os',
      'content/dist/layered/rhel9/s390x/rhelai/3.3/source/SRPMS',
      'content/dist/layered/rhel9/x86_64/rhelai-cuda/3.3/debug',
      'content/dist/layered/rhel9/x86_64/rhelai-cuda/3.3/os',
      'content/dist/layered/rhel9/x86_64/rhelai-cuda/3.3/source/SRPMS',
      'content/dist/layered/rhel9/x86_64/rhelai-gaudi/3.3/debug',
      'content/dist/layered/rhel9/x86_64/rhelai-gaudi/3.3/os',
      'content/dist/layered/rhel9/x86_64/rhelai-gaudi/3.3/source/SRPMS',
      'content/dist/layered/rhel9/x86_64/rhelai/3.3/debug',
      'content/dist/layered/rhel9/x86_64/rhelai/3.3/os',
      'content/dist/layered/rhel9/x86_64/rhelai/3.3/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'ffmpeg-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ffmpeg-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavcodec-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavcodec-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavdevice-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavdevice-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavfilter-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavfilter-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavformat-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavformat-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavutil-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libavutil-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libpostproc-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libpostproc-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libswresample-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libswresample-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libswscale-free-rhai-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libswscale-free-rhai-devel-6.1.6-3.el9ai', 'el_string':'el9ai', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ffmpeg-free-rhai / ffmpeg-free-rhai-devel / libavcodec-free-rhai / etc');
}