usn-8390-1
Vulnerability from osv_ubuntu
Published
2026-06-04 21:13
Modified
2026-06-30 15:55
Summary
linux, linux-azure, linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm, linux-oracle vulnerability
Details

It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container.


{
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              "id": "CVE-2026-43284",
              "severity": [
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                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
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        "4.15.0-1118.129",
        "4.15.0-1119.130",
        "4.15.0-1121.132",
        "4.15.0-1122.133",
        "4.15.0-1123.134",
        "4.15.0-1124.135",
        "4.15.0-1125.136",
        "4.15.0-1126.137",
        "4.15.0-1127.138",
        "4.15.0-1128.139",
        "4.15.0-1129.140",
        "4.15.0-1130.141",
        "4.15.0-1131.142",
        "4.15.0-1132.143",
        "4.15.0-1133.144",
        "4.15.0-1134.145",
        "4.15.0-1135.146",
        "4.15.0-1136.147",
        "4.15.0-1137.148",
        "4.15.0-1138.149",
        "4.15.0-1139.150",
        "4.15.0-1140.151",
        "4.15.0-1141.153",
        "4.15.0-1142.154",
        "4.15.0-1143.155",
        "4.15.0-1144.156",
        "4.15.0-1145.157",
        "4.15.0-1146.158",
        "4.15.0-1147.159"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-43284",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:FIPS-updates:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-gcp-fips-headers-4.15.0-2094",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-gcp-fips-tools-4.15.0-2094",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-headers-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-image-unsigned-hmac-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-modules-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-modules-extra-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          },
          {
            "binary_name": "linux-tools-4.15.0-2094-gcp-fips",
            "binary_version": "4.15.0-2094.100"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:FIPS-updates:18.04:LTS",
        "name": "linux-gcp-fips",
        "purl": "pkg:deb/ubuntu/linux-gcp-fips@4.15.0-2094.100?arch=source\u0026distro=fips-updates/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-2094.100"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-2013.14",
        "4.15.0-2016.18",
        "4.15.0-2017.19",
        "4.15.0-2018.20",
        "4.15.0-2019.21",
        "4.15.0-2020.22",
        "4.15.0-2021.23",
        "4.15.0-2022.24",
        "4.15.0-2024.26",
        "4.15.0-2025.27",
        "4.15.0-2026.28",
        "4.15.0-2028.31",
        "4.15.0-2029.32",
        "4.15.0-2030.33",
        "4.15.0-2031.34",
        "4.15.0-2032.35",
        "4.15.0-2034.37",
        "4.15.0-2037.41",
        "4.15.0-2040.45",
        "4.15.0-2041.46",
        "4.15.0-2043.48",
        "4.15.0-2044.49",
        "4.15.0-2045.50",
        "4.15.0-2047.52",
        "4.15.0-2050.55",
        "4.15.0-2052.57",
        "4.15.0-2054.59",
        "4.15.0-2055.60",
        "4.15.0-2056.61",
        "4.15.0-2057.62",
        "4.15.0-2058.63",
        "4.15.0-2059.64",
        "4.15.0-2060.65",
        "4.15.0-2061.66",
        "4.15.0-2062.67",
        "4.15.0-2063.68",
        "4.15.0-2064.69",
        "4.15.0-2065.70",
        "4.15.0-2066.71",
        "4.15.0-2067.72",
        "4.15.0-2068.73",
        "4.15.0-2069.74",
        "4.15.0-2070.75",
        "4.15.0-2071.76",
        "4.15.0-2072.77",
        "4.15.0-2073.78",
        "4.15.0-2074.79",
        "4.15.0-2075.80",
        "4.15.0-2076.81",
        "4.15.0-2077.83",
        "4.15.0-2078.84",
        "4.15.0-2079.85",
        "4.15.0-2080.86",
        "4.15.0-2081.87",
        "4.15.0-2082.88",
        "4.15.0-2083.89",
        "4.15.0-2084.90",
        "4.15.0-2085.91",
        "4.15.0-2086.92",
        "4.15.0-2087.93",
        "4.15.0-2088.94",
        "4.15.0-2089.95",
        "4.15.0-2090.96",
        "4.15.0-2091.97",
        "4.15.0-2092.98",
        "4.15.0-2093.99"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the Linux kernel did not properly handle shared page\nfragments during socket buffer operations, collectively known as Dirty\nFrag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the\nRxRPC networking subsystem when processing paged fragments. A local\nattacker could use this to escalate privileges, or possibly escape a\ncontainer.\n",
  "id": "USN-8390-1",
  "modified": "2026-06-30T15:55:20Z",
  "published": "2026-06-04T21:13:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8390-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43284"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-azure, linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm, linux-oracle vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-43284"
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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