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Linux Distros Unpatched Vulnerability : CVE-2026-2340

🗓️ 26 May 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Unpatched vulnerability CVE-2026-2340 affects Linux distros, including Debian samba and Ubuntu vfs module.

Related
Refs
Code
ReporterTitlePublishedViews
Family
AlpineLinux
CVE-2026-2340
27 May 202612:09
alpinelinux
Circl
CVE-2026-2340
26 May 202614:33
circl
CNNVD
Samba 安全漏洞
27 May 202600:00
cnnvd
CVE
CVE-2026-2340
27 May 202612:09
cve
Cvelist
CVE-2026-2340 Samba: vfs_worm does not block directory modification
27 May 202612:09
cvelist
Debian
[SECURITY] [DSA 6297-1] samba security update
26 May 202613:49
debian
Debian CVE
CVE-2026-2340
27 May 202612:09
debiancve
Tenable Nessus
Debian dsa-6297 : ctdb - security update
26 May 202600:00
nessus
Tenable Nessus
Fedora 44 : freeipa / samba (2026-7567819345)
2 Jun 202600:00
nessus
Tenable Nessus
Fedora 45 : freeipa / samba (2026-9b08621bdc)
29 May 202600:00
nessus
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
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  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.

  - A flaw was found in Samba's vfs_worm module. The module is intended to provide write-once, read-many
    (WORM) protections by preventing modification of files after a configurable grace period. Due to
    insufficient validation during rename operations, an authenticated user with write access to a share could
    overwrite a protected file by renaming a newly created file over the existing WORM-protected file.
    (CVE-2026-2340)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2340");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-2340");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
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  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/26");

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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-vfs-iouring");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libwbclient");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-tools");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-vfs-iouring");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-krb5-locator");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winexe");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04");

  exit(0);
}

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/CentOS/rpm-list")) && 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');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnss-winbind"},
          {"reference": "libpam-winbind"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-dev"},
          {"reference": "libwbclient-dev"},
          {"reference": "libwbclient0"},
          {"reference": "python3-samba"},
          {"reference": "registry-tools"},
          {"reference": "samba"},
          {"reference": "samba-common"},
          {"reference": "samba-common-bin"},
          {"reference": "samba-dev"},
          {"reference": "samba-dsdb-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-testsuite"},
          {"reference": "samba-vfs-modules"},
          {"reference": "smbclient"},
          {"reference": "winbind"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnss-winbind"},
          {"reference": "libpam-winbind"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-dev"},
          {"reference": "libwbclient-dev"},
          {"reference": "libwbclient0"},
          {"reference": "python3-samba"},
          {"reference": "registry-tools"},
          {"reference": "samba"},
          {"reference": "samba-common"},
          {"reference": "samba-common-bin"},
          {"reference": "samba-dev"},
          {"reference": "samba-dsdb-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-testsuite"},
          {"reference": "samba-vfs-modules"},
          {"reference": "smbclient"},
          {"reference": "winbind"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "libnss-winbind"},
          {"reference": "libpam-smbpass"},
          {"reference": "libpam-winbind"},
          {"reference": "libparse-pidl-perl"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-dev"},
          {"reference": "libsmbsharemodes-dev"},
          {"reference": "libsmbsharemodes0"},
          {"reference": "libwbclient-dev"},
          {"reference": "libwbclient0"},
          {"reference": "python-samba"},
          {"reference": "registry-tools"},
          {"reference": "samba"},
          {"reference": "samba-common"},
          {"reference": "samba-common-bin"},
          {"reference": "samba-dbg"},
          {"reference": "samba-dev"},
          {"reference": "samba-doc"},
          {"reference": "samba-dsdb-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-testsuite"},
          {"reference": "samba-vfs-modules"},
          {"reference": "smbclient"},
          {"reference": "winbind"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnss-winbind"},
          {"reference": "libpam-winbind"},
          {"reference": "libparse-pidl-perl"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-dev"},
          {"reference": "libwbclient-dev"},
          {"reference": "libwbclient0"},
          {"reference": "python-samba"},
          {"reference": "registry-tools"},
          {"reference": "samba"},
          {"reference": "samba-common"},
          {"reference": "samba-common-bin"},
          {"reference": "samba-dbg"},
          {"reference": "samba-dev"},
          {"reference": "samba-dsdb-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-testsuite"},
          {"reference": "samba-vfs-modules"},
          {"reference": "smbclient"},
          {"reference": "winbind"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnss-winbind"},
          {"reference": "libpam-winbind"},
          {"reference": "libparse-pidl-perl"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-dev"},
          {"reference": "libwbclient-dev"},
          {"reference": "libwbclient0"},
          {"reference": "python-samba"},
          {"reference": "registry-tools"},
          {"reference": "samba"},
          {"reference": "samba-common"},
          {"reference": "samba-common-bin"},
          {"reference": "samba-dev"},
          {"reference": "samba-dsdb-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-testsuite"},
          {"reference": "samba-vfs-modules"},
          {"reference": "smbclient"},
          {"reference": "winbind"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-ldb"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-devel"},
          {"reference": "ctdb-tests"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-python"},
          {"reference": "samba-python-test"},
          {"reference": "samba-test"},
          {"reference": "samba-test-devel"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-vfs-glusterfs"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-devel"},
          {"reference": "ctdb-tests"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-python"},
          {"reference": "samba-python-test"},
          {"reference": "samba-test"},
          {"reference": "samba-test-devel"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-vfs-glusterfs"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-tests"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-tests"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  }
};

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');
}

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02 Jun 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.16.5
EPSS0.00034
SSVC
4