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Linux Distros Unpatched Vulnerability : CVE-2026-64566

🗓️ 05 Aug 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 6 Views

CVE-2026-64566: iptfs frag copy does not propagate SKBFL_SHARED_FRAG, risking memory corruption.

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ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-64566
5 Aug 202608:06
attackerkb
cve
CVE
CVE-2026-64566
5 Aug 202608:06
cve
cvelist
Cvelist
CVE-2026-64566 xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()
5 Aug 202608:06
cvelist
debiancve
Debian CVE
CVE-2026-64566
5 Aug 202608:06
debiancve
euvd
EUVD
EUVD-2026-53260
5 Aug 202608:06
euvd
nvd
NVD
CVE-2026-64566
5 Aug 202608:16
nvd
osv
OSV
BELL-CVE-2026-64566
7 Aug 202606:05
osv
osv
OSV
DEBIAN-CVE-2026-64566
5 Aug 202608:16
osv
osv
OSV
UBUNTU-CVE-2026-64566
5 Aug 202608:16
osv
redhatcve
RedhatCVE
CVE-2026-64566
6 Aug 202610:23
redhatcve
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#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(332767);
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  script_cve_id("CVE-2026-64566");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-64566");

  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.

  - xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() When iptfs_skb_add_frags() copies frag
    references from the source frag walk into a new SKB, it increments the page reference count via
    __skb_frag_ref() but does not propagate SKBFL_SHARED_FRAG to the destination SKB's skb_shinfo->flags. If
    the source SKB carries shared frags (e.g. from a page-pool backed receive path), the new inner SKB will
    appear to ESP as having privately owned frags. A subsequent esp_input() call for a nested transport-mode
    SA then takes the no-COW fast path and decrypts in place, writing over pages that are still referenced by
    the outer IPTFS SKB. This causes kernel-visible memory corruption and can trigger a panic. All other frag-
    transfer helpers in the kernel (skb_try_coalesce, skb_gro_receive, __pskb_copy_fclone, skb_shift,
    skb_segment) correctly propagate SKBFL_SHARED_FRAG; align iptfs_skb_add_frags() with this convention by
    setting the flag inside the loop immediately after __skb_frag_ref() and nr_frags++, so every exit path
    that attaches a frag unconditionally propagates SKBFL_SHARED_FRAG. (CVE-2026-64566)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-64566");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-64566");

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  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");
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  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/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "linux-aws-5.0"},
          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
          {"reference": "linux-azure-headers-4.15.0"},
          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
          {"reference": "linux-gcp-5.3"},
          {"reference": "linux-gcp-headers-4.15.0"},
          {"reference": "linux-gcp-tools-4.15.0"},
          {"reference": "linux-gke-4.15"},
          {"reference": "linux-gke-5.4"},
          {"reference": "linux-gkeop-5.4"},
          {"reference": "linux-headers-4.15.0"},
          {"reference": "linux-hwe"},
          {"reference": "linux-hwe-edge"},
          {"reference": "linux-image-4.15.0"},
          {"reference": "linux-image-unsigned-4.15.0"},
          {"reference": "linux-modules-4.15.0"},
          {"reference": "linux-modules-extra-4.15.0"},
          {"reference": "linux-oem-headers-4.15.0"},
          {"reference": "linux-oem-tools-4.15.0"},
          {"reference": "linux-oracle-5.0"},
          {"reference": "linux-oracle-5.3"},
          {"reference": "linux-tools-4.15.0"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-oem"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "linux-aws-5.11"},
          {"reference": "linux-aws-5.13"},
          {"reference": "linux-aws-5.8"},
          {"reference": "linux-azure-5.11"},
          {"reference": "linux-azure-5.13"},
          {"reference": "linux-azure-5.8"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-buildinfo-5.4.0"},
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          {"reference": "linux-cloud-tools-5.6.0"},
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          {"reference": "linux-gcp-5.13"},
          {"reference": "linux-gcp-5.8"},
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          {"reference": "linux-gkeop-5.15"},
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          {"reference": "linux-hwe-5.8"},
          {"reference": "linux-image-5.4.0"},
          {"reference": "linux-image-unsigned-5.6.0"},
          {"reference": "linux-intel-5.13"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-5.4.0"},
          {"reference": "linux-modules-5.6.0"},
          {"reference": "linux-modules-extra-5.4.0"},
          {"reference": "linux-modules-extra-5.6.0"},
          {"reference": "linux-oem-5.10"},
          {"reference": "linux-oem-5.13"},
          {"reference": "linux-oem-5.14"},
          {"reference": "linux-oem-5.6-headers-5.6.0"},
          {"reference": "linux-oem-5.6-tools-5.6.0"},
          {"reference": "linux-oem-5.6-tools-common"},
          {"reference": "linux-oem-5.6-tools-host"},
          {"reference": "linux-oracle-5.11"},
          {"reference": "linux-oracle-5.13"},
          {"reference": "linux-oracle-5.8"},
          {"reference": "linux-raspi2"},
          {"reference": "linux-riscv-5.11"},
          {"reference": "linux-riscv-5.8"},
          {"reference": "linux-riscv-headers-5.4.0"},
          {"reference": "linux-riscv-tools-5.4.0"},
          {"reference": "linux-tools-5.4.0"},
          {"reference": "linux-tools-5.6.0"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-oem"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "linux-allwinner-5.19"},
          {"reference": "linux-aws-5.19"},
          {"reference": "linux-aws-6.2"},
          {"reference": "linux-aws-6.5"},
          {"reference": "linux-azure-5.19"},
          {"reference": "linux-azure-6.2"},
          {"reference": "linux-azure-6.5"},
          {"reference": "linux-azure-fde-5.19"},
          {"reference": "linux-azure-fde-6.2"},
          {"reference": "linux-azure-fde-6.8"},
          {"reference": "linux-buildinfo-5.15.0"},
          {"reference": "linux-buildinfo-5.17.0"},
          {"reference": "linux-cloud-tools-5.15.0"},
          {"reference": "linux-cloud-tools-5.17.0"},
          {"reference": "linux-gcp-5.19"},
          {"reference": "linux-gcp-6.2"},
          {"reference": "linux-gcp-6.5"},
          {"reference": "linux-headers-5.15.0"},
          {"reference": "linux-headers-5.17.0"},
          {"reference": "linux-hwe-5.19"},
          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
          {"reference": "linux-image-5.15.0"},
          {"reference": "linux-image-unsigned-5.17.0"},
          {"reference": "linux-intel-iot-realtime"},
          {"reference": "linux-lowlatency-hwe-5.19"},
          {"reference": "linux-lowlatency-hwe-6.2"},
          {"reference": "linux-lowlatency-hwe-6.5"},
          {"reference": "linux-modules-5.15.0"},
          {"reference": "linux-modules-5.17.0"},
          {"reference": "linux-modules-extra-5.15.0"},
          {"reference": "linux-modules-extra-5.17.0"},
          {"reference": "linux-nvidia-6.2"},
          {"reference": "linux-nvidia-6.5"},
          {"reference": "linux-oem-5.17-headers-5.17.0"},
          {"reference": "linux-oem-5.17-tools-5.17.0"},
          {"reference": "linux-oem-5.17-tools-host"},
          {"reference": "linux-oem-6.0"},
          {"reference": "linux-oem-6.1"},
          {"reference": "linux-oem-6.5"},
          {"reference": "linux-oracle-6.5"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-aws-6.14"},
          {"reference": "linux-aws-6.17"},
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.14"},
          {"reference": "linux-azure-6.17"},
          {"reference": "linux-azure-fde-6.14"},
          {"reference": "linux-azure-nvidia-6.14"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-gcp-6.14"},
          {"reference": "linux-gcp-6.17"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"reference": "linux-hwe-6.17"},
          {"reference": "linux-hwe-7.0"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-nvidia-6.11"},
          {"reference": "linux-nvidia-6.17"},
          {"reference": "linux-nvidia-7.0"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"reference": "linux-oem-6.17"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-oracle-6.14"},
          {"reference": "linux-oracle-6.17"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"reference": "linux-riscv-6.17"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-7.0.0"},
          {"reference": "linux-aws-headers-7.0.0"},
          {"reference": "linux-aws-tools-7.0.0"},
          {"reference": "linux-azure-cloud-tools-7.0.0"},
          {"reference": "linux-azure-fde-cloud-tools-7.0.0"},
          {"reference": "linux-azure-fde-headers-7.0.0"},
          {"reference": "linux-azure-fde-tools-7.0.0"},
          {"reference": "linux-azure-headers-7.0.0"},
          {"reference": "linux-azure-tools-7.0.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-7.0.0"},
          {"reference": "linux-cloud-tools-7.0.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-7.0.0"},
          {"reference": "linux-gcp-tools-7.0.0"},
          {"reference": "linux-gke"},
          {"reference": "linux-headers-7.0.0"},
          {"reference": "linux-ibm-cloud-tools-7.0.0"},
          {"reference": "linux-ibm-headers-7.0.0"},
          {"reference": "linux-ibm-tools-7.0.0"},
          {"reference": "linux-image-7.0.0"},
          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-lib-rust-7.0.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-modules-extra-7.0.0"},
          {"reference": "linux-nvidia"},
          {"reference": "linux-nvidia-bos"},
          {"reference": "linux-oem-7.0"},
          {"reference": "linux-oracle-headers-7.0.0"},
          {"reference": "linux-oracle-tools-7.0.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-7.0.0"},
          {"reference": "linux-raspi-tools-7.0.0"},
          {"reference": "linux-realtime-cloud-tools-7.0.0"},
          {"reference": "linux-realtime-headers-7.0.0"},
          {"reference": "linux-realtime-tools-7.0.0"},
          {"reference": "linux-riscv-headers-7.0.0"},
          {"reference": "linux-riscv-tools-7.0.0"},
          {"reference": "linux-source-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-azure-fde"}
        ]
      }
    ]
  }
};

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

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07 Aug 2026 00:00Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.19.8
EPSS0.00154
6