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RHEL 9 : acl (RHSA-2026:42736)

🗓️ 21 Jul 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

RHEL 9 acl fixes two symlink traversal and TOCTOU vulnerabilities (CVE-2026-54369, CVE-2026-54370).

Related
Refs
Code
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-54370
29 Jun 202612:38
attackerkb
ATTACKERKB
CVE-2026-54369
29 Jun 202612:37
attackerkb
Tenable Nessus
Amazon Linux 2023 : acl, libacl, libacl-devel (ALAS2023-2026-1986)
20 Jul 202600:00
nessus
Tenable Nessus
Fedora 43 : acl (2026-67504c329b)
12 Jul 202600:00
nessus
Tenable Nessus
Fedora 44 : acl (2026-6b9a652463)
11 Jul 202600:00
nessus
Tenable Nessus
Oracle Linux 9 : acl (ELSA-2026-42736)
21 Jul 202600:00
nessus
Tenable Nessus
Oracle Linux 10 : acl (ELSA-2026-42739)
22 Jul 202600:00
nessus
Tenable Nessus
RHEL 10 : acl (RHSA-2026:42739)
21 Jul 202600:00
nessus
Tenable Nessus
RHEL 8 : acl (RHSA-2026:43420)
22 Jul 202600:00
nessus
Tenable Nessus
Linux Distros Unpatched Vulnerability : CVE-2026-54369
30 Jun 202600:00
nessus
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:42736. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(328857);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  script_cve_id("CVE-2026-54369", "CVE-2026-54370");
  script_xref(name:"RHSA", value:"2026:42736");

  script_name(english:"RHEL 9 : acl (RHSA-2026:42736)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for acl.");
  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-2026:42736 advisory.

    Access Control Lists (ACLs) are used to define fine-grained discretionary access rights for files and
    directories. The acl packages contain the getfacl and setfacl utilities needed for manipulating access
    control lists.

    Security Fix(es):

    * acl: Symlink traversal privilege escalation via libacl functions (CVE-2026-54369)

    * acl: TOCTOU Symlink Traversal via getfacl/setfacl (CVE-2026-54370)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

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");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2490277");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2490279");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_42736.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8790f7dd");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:42736");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL acl package based on the guidance in RHSA-2026:42736.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/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:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-54369");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(59, 367);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  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:"cpe:/o:redhat:rhel_eus:9.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:acl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libacl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libacl-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_list(operator: 'ge', os_version: os_version, rhel_versions: ['9','9.8'])) 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);

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      'content/dist/rhel9/9.1/ppc64le/appstream/debug',
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      'content/dist/rhel9/9.7/aarch64/baseos/debug',
      'content/dist/rhel9/9.7/aarch64/baseos/os',
      'content/dist/rhel9/9.7/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/ppc64le/baseos/debug',
      'content/dist/rhel9/9.7/ppc64le/baseos/os',
      'content/dist/rhel9/9.7/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/s390x/baseos/debug',
      'content/dist/rhel9/9.7/s390x/baseos/os',
      'content/dist/rhel9/9.7/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/x86_64/baseos/debug',
      'content/dist/rhel9/9.7/x86_64/baseos/os',
      'content/dist/rhel9/9.7/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/aarch64/baseos/debug',
      'content/dist/rhel9/9.8/aarch64/baseos/os',
      'content/dist/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/ppc64le/baseos/debug',
      'content/dist/rhel9/9.8/ppc64le/baseos/os',
      'content/dist/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/s390x/baseos/debug',
      'content/dist/rhel9/9.8/s390x/baseos/os',
      'content/dist/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/x86_64/baseos/debug',
      'content/dist/rhel9/9.8/x86_64/baseos/os',
      'content/dist/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/aarch64/baseos/debug',
      'content/dist/rhel9/9.9/aarch64/baseos/os',
      'content/dist/rhel9/9.9/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/ppc64le/baseos/debug',
      'content/dist/rhel9/9.9/ppc64le/baseos/os',
      'content/dist/rhel9/9.9/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/s390x/baseos/debug',
      'content/dist/rhel9/9.9/s390x/baseos/os',
      'content/dist/rhel9/9.9/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/x86_64/baseos/debug',
      'content/dist/rhel9/9.9/x86_64/baseos/os',
      'content/dist/rhel9/9.9/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9/aarch64/baseos/debug',
      'content/dist/rhel9/9/aarch64/baseos/os',
      'content/dist/rhel9/9/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9/ppc64le/baseos/debug',
      'content/dist/rhel9/9/ppc64le/baseos/os',
      'content/dist/rhel9/9/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9/s390x/baseos/debug',
      'content/dist/rhel9/9/s390x/baseos/os',
      'content/dist/rhel9/9/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9/x86_64/baseos/debug',
      'content/dist/rhel9/9/x86_64/baseos/os',
      'content/dist/rhel9/9/x86_64/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/debug',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/os',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/debug',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/os',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/debug',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/os',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/debug',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/os',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'acl-2.4.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-54370']},
      {'reference':'libacl-2.4.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-54369']}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/appstream/debug',
      'content/e4s/rhel9/9.8/aarch64/appstream/os',
      'content/e4s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e4s/rhel9/9.8/ppc64le/appstream/os',
      'content/e4s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/appstream/debug',
      'content/e4s/rhel9/9.8/s390x/appstream/os',
      'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/appstream/debug',
      'content/e4s/rhel9/9.8/x86_64/appstream/os',
      'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/appstream/debug',
      'content/e6s/rhel9/9.8/aarch64/appstream/os',
      'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e6s/rhel9/9.8/ppc64le/appstream/os',
      'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/appstream/debug',
      'content/e6s/rhel9/9.8/s390x/appstream/os',
      'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/appstream/debug',
      'content/e6s/rhel9/9.8/x86_64/appstream/os',
      'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/appstream/debug',
      'content/eus/rhel9/9.8/aarch64/appstream/os',
      'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/appstream/debug',
      'content/eus/rhel9/9.8/ppc64le/appstream/os',
      'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/appstream/debug',
      'content/eus/rhel9/9.8/s390x/appstream/os',
      'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/appstream/debug',
      'content/eus/rhel9/9.8/x86_64/appstream/os',
      'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'libacl-devel-2.4.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-54369']}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/baseos/debug',
      'content/e4s/rhel9/9.8/aarch64/baseos/os',
      'content/e4s/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/baseos/debug',
      'content/e4s/rhel9/9.8/ppc64le/baseos/os',
      'content/e4s/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/baseos/debug',
      'content/e4s/rhel9/9.8/s390x/baseos/os',
      'content/e4s/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/baseos/debug',
      'content/e4s/rhel9/9.8/x86_64/baseos/os',
      'content/e4s/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/baseos/debug',
      'content/e6s/rhel9/9.8/aarch64/baseos/os',
      'content/e6s/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/baseos/debug',
      'content/e6s/rhel9/9.8/ppc64le/baseos/os',
      'content/e6s/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/baseos/debug',
      'content/e6s/rhel9/9.8/s390x/baseos/os',
      'content/e6s/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/baseos/debug',
      'content/e6s/rhel9/9.8/x86_64/baseos/os',
      'content/e6s/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/baseos/debug',
      'content/eus/rhel9/9.8/aarch64/baseos/os',
      'content/eus/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/baseos/debug',
      'content/eus/rhel9/9.8/ppc64le/baseos/os',
      'content/eus/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/baseos/debug',
      'content/eus/rhel9/9.8/s390x/baseos/os',
      'content/eus/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/baseos/debug',
      'content/eus/rhel9/9.8/x86_64/baseos/os',
      'content/eus/rhel9/9.8/x86_64/baseos/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'acl-2.4.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-54370']},
      {'reference':'libacl-2.4.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-54369']}
    ]
  }
];

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_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'acl / libacl / libacl-devel');
}

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21 Jul 2026 00:00Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.17.1
CVSS 48.4
EPSS0.00142
SSVC
4