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Linux Distros Unpatched Vulnerability : CVE-2026-77159

🗓️ 11 Sep 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 5 Views

Unpatched symlink-following flaw in libvirt enables arbitrary file ownership transfer to swtpm user.

Related
Refs
Code
ReporterTitlePublishedViews
Family
circl
Circl		CVE-2026-77159
11 Sep 202611:59
–circl
cve
CVE		CVE-2026-77159
11 Sep 202610:32
–cve
cvelist
Cvelist		CVE-2026-77159 Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink
11 Sep 202610:32
–cvelist
debiancve
Debian CVE		CVE-2026-77159
11 Sep 202610:32
–debiancve
euvd
EUVD		EUVD-2026-76034
11 Sep 202610:32
–euvd
nvd
NVD		CVE-2026-77159
11 Sep 202611:16
–nvd
opensuse
OPENSUSE Linux		Security update for libvirt (important)
8 Sep 202600:00
–opensuse
osv
OSV		DEBIAN-CVE-2026-77159
11 Sep 202611:16
–osv
osv
OSV		OPENSUSE-SU-2026:11622-1 libvirt-12.6.0-2.1 on GA media
27 Aug 202600:00
–osv
osv
OSV		OPENSUSE-SU-2026:21738-1 Security update for libvirt
2 Sep 202609:43
–osv
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
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  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-77159");

  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
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  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
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  - A symlink-following flaw was found in libvirt's qemuTPMEmulatorPrepareHost() function. The function uses a
    path-based chown() on the swtpm logfile without checking for symbolic links. A local attacker with access
    to the swtpm account can replace the logfile with a symlink, causing libvirtd (running as root) to
    transfer ownership of an arbitrary file to the swtpm user. (CVE-2026-77159)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"solution", value:
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  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-8", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libnss-libvirt"},
          {"reference": "libvirt-clients"},
          {"reference": "libvirt-clients-qemu"},
          {"reference": "libvirt-daemon"},
          {"reference": "libvirt-daemon-config-network"},
          {"reference": "libvirt-daemon-config-nwfilter"},
          {"reference": "libvirt-daemon-driver-lxc"},
          {"reference": "libvirt-daemon-driver-qemu"},
          {"reference": "libvirt-daemon-driver-storage-gluster"},
          {"reference": "libvirt-daemon-driver-storage-iscsi-direct"},
          {"reference": "libvirt-daemon-driver-storage-rbd"},
          {"reference": "libvirt-daemon-driver-storage-zfs"},
          {"reference": "libvirt-daemon-driver-vbox"},
          {"reference": "libvirt-daemon-driver-xen"},
          {"reference": "libvirt-daemon-system"},
          {"reference": "libvirt-daemon-system-systemd"},
          {"reference": "libvirt-daemon-system-sysv"},
          {"reference": "libvirt-dev"},
          {"reference": "libvirt-doc"},
          {"reference": "libvirt-l10n"},
          {"reference": "libvirt-login-shell"},
          {"reference": "libvirt-sanlock"},
          {"reference": "libvirt-wireshark"},
          {"reference": "libvirt0"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
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          {"reference": "libvirt-daemon"},
          {"reference": "libvirt-daemon-common"},
          {"reference": "libvirt-daemon-config-network"},
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          {"reference": "libvirt-daemon-driver-interface"},
          {"reference": "libvirt-daemon-driver-lxc"},
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          {"reference": "libvirt-daemon-driver-storage-mpath"},
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          {"reference": "libvirt-daemon-plugin-sanlock"},
          {"reference": "libvirt-daemon-system"},
          {"reference": "libvirt-dev"},
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          {"reference": "libvirt-l10n"},
          {"reference": "libvirt0"}
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    ]
  },
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          {"reference": "libvirt-daemon"},
          {"reference": "libvirt-daemon-common"},
          {"reference": "libvirt-daemon-config-network"},
          {"reference": "libvirt-daemon-config-nwfilter"},
          {"reference": "libvirt-daemon-driver-interface"},
          {"reference": "libvirt-daemon-driver-network"},
          {"reference": "libvirt-daemon-driver-nodedev"},
          {"reference": "libvirt-daemon-driver-nwfilter"},
          {"reference": "libvirt-daemon-driver-qemu"},
          {"reference": "libvirt-daemon-driver-secret"},
          {"reference": "libvirt-daemon-driver-storage"},
          {"reference": "libvirt-daemon-driver-storage-core"},
          {"reference": "libvirt-daemon-driver-storage-disk"},
          {"reference": "libvirt-daemon-driver-storage-iscsi"},
          {"reference": "libvirt-daemon-driver-storage-logical"},
          {"reference": "libvirt-daemon-driver-storage-mpath"},
          {"reference": "libvirt-daemon-driver-storage-rbd"},
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          {"reference": "libvirt-daemon-driver-network"},
          {"reference": "libvirt-daemon-driver-nodedev"},
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          {"reference": "libvirt-daemon-driver-secret"},
          {"reference": "libvirt-daemon-driver-storage"},
          {"reference": "libvirt-daemon-driver-storage-core"},
          {"reference": "libvirt-daemon-driver-storage-disk"},
          {"reference": "libvirt-daemon-driver-storage-gluster"},
          {"reference": "libvirt-daemon-driver-storage-iscsi"},
          {"reference": "libvirt-daemon-driver-storage-iscsi-direct"},
          {"reference": "libvirt-daemon-driver-storage-logical"},
          {"reference": "libvirt-daemon-driver-storage-mpath"},
          {"reference": "libvirt-daemon-driver-storage-rbd"},
          {"reference": "libvirt-daemon-driver-storage-scsi"},
          {"reference": "libvirt-daemon-kvm"},
          {"reference": "libvirt-devel"},
          {"reference": "libvirt-docs"},
          {"reference": "libvirt-libs"},
          {"reference": "libvirt-lock-sanlock"},
          {"reference": "libvirt-nss"},
          {"reference": "libvirt-wireshark"}
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    ]
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  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
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          {"reference": "libvirt-daemon-config-nwfilter"},
          {"reference": "libvirt-daemon-driver-interface"},
          {"reference": "libvirt-daemon-driver-network"},
          {"reference": "libvirt-daemon-driver-nodedev"},
          {"reference": "libvirt-daemon-driver-nwfilter"},
          {"reference": "libvirt-daemon-driver-qemu"},
          {"reference": "libvirt-daemon-driver-secret"},
          {"reference": "libvirt-daemon-driver-storage"},
          {"reference": "libvirt-daemon-driver-storage-core"},
          {"reference": "libvirt-daemon-driver-storage-disk"},
          {"reference": "libvirt-daemon-driver-storage-gluster"},
          {"reference": "libvirt-daemon-driver-storage-iscsi"},
          {"reference": "libvirt-daemon-driver-storage-iscsi-direct"},
          {"reference": "libvirt-daemon-driver-storage-logical"},
          {"reference": "libvirt-daemon-driver-storage-mpath"},
          {"reference": "libvirt-daemon-driver-storage-rbd"},
          {"reference": "libvirt-daemon-driver-storage-scsi"},
          {"reference": "libvirt-daemon-kvm"},
          {"reference": "libvirt-devel"},
          {"reference": "libvirt-docs"},
          {"reference": "libvirt-libs"},
          {"reference": "libvirt-lock-sanlock"},
          {"reference": "libvirt-nss"},
          {"reference": "libvirt-wireshark"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
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          {"reference": "libvirt-client"},
          {"reference": "libvirt-client-qemu"},
          {"reference": "libvirt-daemon"},
          {"reference": "libvirt-daemon-common"},
          {"reference": "libvirt-daemon-config-network"},
          {"reference": "libvirt-daemon-config-nwfilter"},
          {"reference": "libvirt-daemon-driver-interface"},
          {"reference": "libvirt-daemon-driver-network"},
          {"reference": "libvirt-daemon-driver-nodedev"},
          {"reference": "libvirt-daemon-driver-nwfilter"},
          {"reference": "libvirt-daemon-driver-qemu"},
          {"reference": "libvirt-daemon-driver-secret"},
          {"reference": "libvirt-daemon-driver-storage"},
          {"reference": "libvirt-daemon-driver-storage-core"},
          {"reference": "libvirt-daemon-driver-storage-disk"},
          {"reference": "libvirt-daemon-driver-storage-iscsi"},
          {"reference": "libvirt-daemon-driver-storage-logical"},
          {"reference": "libvirt-daemon-driver-storage-mpath"},
          {"reference": "libvirt-daemon-driver-storage-rbd"},
          {"reference": "libvirt-daemon-driver-storage-scsi"},
          {"reference": "libvirt-daemon-kvm"},
          {"reference": "libvirt-daemon-lock"},
          {"reference": "libvirt-daemon-log"},
          {"reference": "libvirt-daemon-plugin-lockd"},
          {"reference": "libvirt-daemon-plugin-sanlock"},
          {"reference": "libvirt-daemon-proxy"},
          {"reference": "libvirt-devel"},
          {"reference": "libvirt-docs"},
          {"reference": "libvirt-libs"},
          {"reference": "libvirt-lock-sanlock"},
          {"reference": "libvirt-nss"},
          {"reference": "libvirt-ssh-proxy"}
        ]
      }
    ]
  }
};

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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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12 Sep 2026 00:00Current
CVSS 3.15.5
EPSS0.00162
libvirtsymlink-followingchownswtpmlocal privilegeunpatched
5