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RHEL 9 : p11-kit (RHSA-2026:18599)

🗓️ 19 May 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 27 Views

RHEL 9 p11-kit is affected by a NULL dereference via C_DeriveKey with NULL parameters (CVE-2026-2100) per RHSA-2026:18599.

Related
Refs
Code
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to multiple Base OS issues
18 Jun 202619:59
–ibm
IBM Security Bulletins		Security Bulletin: IBM App Connect Enterprise Certified Container UBI updates
2 Jul 202610:48
–ibm
IBM Security Bulletins		Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to multiple Operator package issues
18 Jun 202620:00
–ibm
ATTACKERKB		CVE-2026-2100
26 Mar 202620:01
–attackerkb
AlpineLinux		CVE-2026-2100
26 Mar 202620:01
–alpinelinux
AlmaLinux		Moderate: p11-kit security update
19 May 202600:00
–almalinux
Circl		CVE-2026-2100
7 Feb 202600:01
–circl
CNNVD		P11-glue P11-kit 安全漏洞
26 Mar 202600:00
–cnnvd
CVE		CVE-2026-2100
26 Mar 202620:01
–cve
Cvelist		CVE-2026-2100 P11-kit: null dereference via c_derivekey with specific null parameters
26 Mar 202620:01
–cvelist
Rows per page
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##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:18599. The text
# itself is copyright (C) Red Hat, Inc.
##

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if (description)
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  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/19");

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  script_xref(name:"RHSA", value:"2026:18599");

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  script_set_attribute(attribute:"synopsis", value:
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  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2026:18599 advisory.

    The p11-kit packages provide a mechanism to manage PKCS#11 modules. The p11-kit-trust subpackage includes
    a PKCS#11 trust module that provides certificate anchors and black lists based on configuration files.

    Security Fix(es):

    * p11-kit: p11-kit: NULL dereference via C_DeriveKey with specific NULL parameters (CVE-2026-2100)

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes
    linked from 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 this issue but has instead relied only on the application's self-reported version
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  script_set_attribute(attribute:"see_also", value:"https://issues.redhat.com/browse/RHEL-91952");
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  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?96d69b98");
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  script_set_attribute(attribute:"solution", value:
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  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
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  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(824);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/19");

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  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
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  exit(0);
}


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include('rhel.inc');

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

var cpu = get_kb_item('Host/cpu');
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      'content/dist/rhel9/9.9/s390x/appstream/os',
      'content/dist/rhel9/9.9/s390x/appstream/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/appstream/debug',
      'content/dist/rhel9/9.9/x86_64/appstream/os',
      'content/dist/rhel9/9.9/x86_64/appstream/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/appstream/debug',
      'content/dist/rhel9/9/aarch64/appstream/os',
      'content/dist/rhel9/9/aarch64/appstream/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/appstream/debug',
      'content/dist/rhel9/9/ppc64le/appstream/os',
      'content/dist/rhel9/9/ppc64le/appstream/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/appstream/debug',
      'content/dist/rhel9/9/s390x/appstream/os',
      'content/dist/rhel9/9/s390x/appstream/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/appstream/debug',
      'content/dist/rhel9/9/x86_64/appstream/os',
      'content/dist/rhel9/9/x86_64/appstream/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/appstream/debug',
      'content/public/ubi/dist/ubi9/9/aarch64/appstream/os',
      'content/public/ubi/dist/ubi9/9/aarch64/appstream/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/appstream/debug',
      'content/public/ubi/dist/ubi9/9/ppc64le/appstream/os',
      'content/public/ubi/dist/ubi9/9/ppc64le/appstream/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/appstream/debug',
      'content/public/ubi/dist/ubi9/9/s390x/appstream/os',
      'content/public/ubi/dist/ubi9/9/s390x/appstream/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/appstream/debug',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/os',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/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':'p11-kit-0.26.2-1.el9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'p11-kit-client-0.26.2-1.el9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'p11-kit-devel-0.26.2-1.el9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'p11-kit-server-0.26.2-1.el9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'p11-kit-trust-0.26.2-1.el9', '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, 'p11-kit / p11-kit-client / p11-kit-devel / p11-kit-server / etc');
}

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19 May 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.3 - 7.5
EPSS0.01129
SSVC
red hat advisoryp11 kit vulnerabilitynull dereferencederive keycve 2026 210018599
27