usn-3740-2
Vulnerability from osv_ubuntu
Published
2018-08-14 21:46
Modified
2026-06-01 07:03
Summary
linux-hwe, linux-azure, linux-gcp vulnerabilities
Details

USN-3740-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS.

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620)

Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391)

References
To clipboard 

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          {
            "binary_name": "plip-modules-4.15.0-32-generic-di",
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            "binary_name": "scsi-modules-4.15.0-32-generic-di",
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            "binary_version": "4.15.0-32.35~16.04.1"
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          {
            "binary_name": "serial-modules-4.15.0-32-generic-di",
            "binary_version": "4.15.0-32.35~16.04.1"
          },
          {
            "binary_name": "storage-core-modules-4.15.0-32-generic-di",
            "binary_version": "4.15.0-32.35~16.04.1"
          },
          {
            "binary_name": "storage-core-modules-4.15.0-32-generic-lpae-di",
            "binary_version": "4.15.0-32.35~16.04.1"
          },
          {
            "binary_name": "usb-modules-4.15.0-32-generic-di",
            "binary_version": "4.15.0-32.35~16.04.1"
          },
          {
            "binary_name": "usb-modules-4.15.0-32-generic-lpae-di",
            "binary_version": "4.15.0-32.35~16.04.1"
          },
          {
            "binary_name": "virtio-modules-4.15.0-32-generic-di",
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          {
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      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "linux-hwe",
        "purl": "pkg:deb/ubuntu/linux-hwe@4.15.0-32.35~16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-32.35~16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.8.0-36.36~16.04.1",
        "4.8.0-39.42~16.04.1",
        "4.8.0-41.44~16.04.1",
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        "4.8.0-44.47~16.04.1",
        "4.8.0-45.48~16.04.1",
        "4.8.0-46.49~16.04.1",
        "4.8.0-49.52~16.04.1",
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        "4.8.0-56.61~16.04.1",
        "4.8.0-58.63~16.04.1",
        "4.10.0-27.30~16.04.2",
        "4.10.0-28.32~16.04.2",
        "4.10.0-30.34~16.04.1",
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        "4.10.0-33.37~16.04.1",
        "4.10.0-35.39~16.04.1",
        "4.10.0-37.41~16.04.1",
        "4.10.0-38.42~16.04.1",
        "4.10.0-40.44~16.04.1",
        "4.10.0-42.46~16.04.1",
        "4.13.0-26.29~16.04.2",
        "4.13.0-31.34~16.04.1",
        "4.13.0-32.35~16.04.1",
        "4.13.0-36.40~16.04.1",
        "4.13.0-37.42~16.04.1",
        "4.13.0-38.43~16.04.1",
        "4.13.0-39.44~16.04.1",
        "4.13.0-41.46~16.04.1",
        "4.13.0-43.48~16.04.1",
        "4.13.0-45.50~16.04.1",
        "4.15.0-24.26~16.04.1",
        "4.15.0-29.31~16.04.1",
        "4.15.0-30.32~16.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-3740-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04\nLTS. This update provides the corresponding updates for the Linux\nHardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu\n16.04 LTS.\n\nIt was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker in a guest virtual machine could use this to expose sensitive\ninformation (memory from other guests or the host OS). (CVE-2018-3646)\n\nIt was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker could use this to expose sensitive information (memory from the\nkernel or other processes). (CVE-2018-3620)\n\nJuha-Matti Tilli discovered that the IP implementation in the Linux kernel\nperformed algorithmically expensive operations in some situations when\nhandling incoming packet fragments. A remote attacker could use this to\ncause a denial of service. (CVE-2018-5391)\n",
  "id": "USN-3740-2",
  "modified": "2026-06-01T07:03:48Z",
  "published": "2018-08-14T21:46:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3740-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3620"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3646"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-5391"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-hwe, linux-azure, linux-gcp vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-3620",
    "UBUNTU-CVE-2018-3646",
    "UBUNTU-CVE-2018-5391"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.