usn-8390-2
Vulnerability from osv_ubuntu
Published
2026-06-17 10:34
Modified
2026-06-30 15:55
Summary
linux-azure, linux-gcp, linux-hwe, 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.

References
To clipboard 

{
  "affected": [
    {
      "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:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-azure-cloud-tools-4.15.0-1202",
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          {
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          },
          {
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            "binary_version": "4.15.0-1202.217~16.04.1"
          },
          {
            "binary_name": "linux-buildinfo-4.15.0-1202-azure",
            "binary_version": "4.15.0-1202.217~16.04.1"
          },
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          {
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    {
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            {
              "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",
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                },
                {
                  "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:16.04:LTS"
        }
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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"
                }
              ]
            }
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        }
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    {
      "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:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "linux-oracle",
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        "4.15.0-1059.65~16.04.1",
        "4.15.0-1061.67~16.04.1",
        "4.15.0-1062.68~16.04.1",
        "4.15.0-1064.71~16.04.1",
        "4.15.0-1065.73~16.04.1",
        "4.15.0-1066.74~16.04.1",
        "4.15.0-1067.75~16.04.1",
        "4.15.0-1068.76~16.04.1",
        "4.15.0-1069.77~16.04.1",
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        "4.15.0-1075.83~16.04.1",
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        "4.15.0-1093.102~16.04.1",
        "4.15.0-1095.104~16.04.1",
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        "4.15.0-1107.118~16.04.1",
        "4.15.0-1108.119~16.04.1",
        "4.15.0-1111.122~16.04.2",
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        "4.15.0-1130.141~16.04.1",
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        "4.15.0-1132.143~16.04.1",
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        "4.15.0-1134.145~16.04.1",
        "4.15.0-1135.146~16.04.1",
        "4.15.0-1136.147~16.04.1",
        "4.15.0-1137.148~16.04.1",
        "4.15.0-1138.149~16.04.1",
        "4.15.0-1139.150~16.04.1",
        "4.15.0-1140.151~16.04.1",
        "4.15.0-1141.152~16.04.1",
        "4.15.0-1142.153~16.04.1",
        "4.15.0-1143.154~16.04.1",
        "4.15.0-1144.155~16.04.1",
        "4.15.0-1145.156~16.04.1",
        "4.15.0-1148.159~16.04.1",
        "4.15.0-1149.160~16.04.1",
        "4.15.0-1150.161~16.04.1",
        "4.15.0-1151.162~16.04.1",
        "4.15.0-1153.164~16.04.1"
      ]
    }
  ],
  "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-8390-2",
  "modified": "2026-06-30T15:55:20Z",
  "published": "2026-06-17T10:34:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8390-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43284"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-azure, linux-gcp, linux-hwe, linux-oracle vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-43284"
  ]
}



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Tags
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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.