USN-8530-2 (UBUNTU-CVE-2021-47202)

Vulnerability from osv_ubuntu – Published: 2026-08-13 21:10 – Updated: 2026-08-19 15:43 – Source website
VLAI
Summary
linux-aws-hwe vulnerabilities
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. (CVE-2026-43284)

It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43503)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - InfiniBand drivers; - SCSI subsystem; - Thermal drivers; - USB over IP driver; - Network file system (NFS) server daemon; - SMB network file system; - Tracing infrastructure; - B.A.T.M.A.N. meshing protocol; - Ethernet bridge; - Ceph Core library; - DCCP (Datagram Congestion Control Protocol); - IPv4 networking; - IPv6 networking; - Netfilter; - RxRPC session sockets; - X.25 network layer; (CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037, CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)

References
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-47202",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2024-56643",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-23272",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-23455",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
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                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31607",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31637",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-31659",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
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                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
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              ]
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            {
              "id": "CVE-2026-31682",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31685",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
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            },
            {
              "id": "CVE-2026-43011",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43037",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43038",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                }
              ]
            },
            {
              "id": "CVE-2026-43383",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
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                },
                {
                  "score": "medium",
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                }
              ]
            },
            {
              "id": "CVE-2026-43407",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43414",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43503",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
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                  "score": "CVSS:3.1/AV:L/AC:H/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"
                }
              ]
            },
            {
              "id": "CVE-2026-45988",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46043",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "critical",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46119",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46243",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "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:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
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                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
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      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "linux-aws-hwe",
        "purl": "pkg:deb/ubuntu/linux-aws-hwe@4.15.0-1194.207~16.04.1?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
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          "events": [
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        "4.15.0-1165.178~16.04.1",
        "4.15.0-1166.179~16.04.1",
        "4.15.0-1167.180~16.04.1",
        "4.15.0-1168.181~16.04.1",
        "4.15.0-1169.182~16.04.1",
        "4.15.0-1170.183~16.04.1",
        "4.15.0-1172.185~16.04.1",
        "4.15.0-1173.186~16.04.1",
        "4.15.0-1174.187~16.04.1",
        "4.15.0-1175.188~16.04.1",
        "4.15.0-1176.189~16.04.1",
        "4.15.0-1177.190~16.04.1",
        "4.15.0-1178.191~16.04.1",
        "4.15.0-1179.192~16.04.1",
        "4.15.0-1180.193~16.04.1",
        "4.15.0-1181.194~16.04.1",
        "4.15.0-1182.195~16.04.1",
        "4.15.0-1183.196~16.04.1",
        "4.15.0-1184.197~16.04.1",
        "4.15.0-1185.198~16.04.1",
        "4.15.0-1186.199~16.04.1",
        "4.15.0-1187.200~16.04.1",
        "4.15.0-1188.201~16.04.1",
        "4.15.0-1189.202~16.04.1",
        "4.15.0-1190.203~16.04.1",
        "4.15.0-1191.204~16.04.1",
        "4.15.0-1192.205~16.04.1"
      ]
    }
  ],
  "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. (CVE-2026-43284)\n\nIt was discovered that a logic flaw existed in the XFRM ESP-in-TCP\nsubsystem in the Linux kernel when handling socket buffer fragments. This\nflaw is known as Fragnesia. A local attacker could use this to escalate\nprivileges, or possibly escape a container. (CVE-2026-43503)\n\nSeveral security issues were discovered in the Linux kernel.\nAn attacker could possibly use these to compromise the system.\nThis update corrects flaws in the following subsystems:\n  - InfiniBand drivers;\n  - SCSI subsystem;\n  - Thermal drivers;\n  - USB over IP driver;\n  - Network file system (NFS) server daemon;\n  - SMB network file system;\n  - Tracing infrastructure;\n  - B.A.T.M.A.N. meshing protocol;\n  - Ethernet bridge;\n  - Ceph Core library;\n  - DCCP (Datagram Congestion Control Protocol);\n  - IPv4 networking;\n  - IPv6 networking;\n  - Netfilter;\n  - RxRPC session sockets;\n  - X.25 network layer;\n(CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455,\nCVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659,\nCVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,\nCVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,\nCVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)\n",
  "id": "USN-8530-2",
  "modified": "2026-08-19T15:43:18Z",
  "published": "2026-08-13T21:10:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8530-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-47202"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-56643"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-23272"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-23455"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31402"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31607"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31637"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31659"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31682"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31685"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43011"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43037"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43038"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43284"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43383"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43407"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43414"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43503"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-45988"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46043"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46119"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46243"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-aws-hwe vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-47202",
    "UBUNTU-CVE-2024-56643",
    "UBUNTU-CVE-2026-23272",
    "UBUNTU-CVE-2026-23455",
    "UBUNTU-CVE-2026-31402",
    "UBUNTU-CVE-2026-31607",
    "UBUNTU-CVE-2026-31637",
    "UBUNTU-CVE-2026-31659",
    "UBUNTU-CVE-2026-31682",
    "UBUNTU-CVE-2026-31685",
    "UBUNTU-CVE-2026-43011",
    "UBUNTU-CVE-2026-43037",
    "UBUNTU-CVE-2026-43038",
    "UBUNTU-CVE-2026-43284",
    "UBUNTU-CVE-2026-43383",
    "UBUNTU-CVE-2026-43407",
    "UBUNTU-CVE-2026-43414",
    "UBUNTU-CVE-2026-43503",
    "UBUNTU-CVE-2026-45988",
    "UBUNTU-CVE-2026-46043",
    "UBUNTU-CVE-2026-46119",
    "UBUNTU-CVE-2026-46243"
  ]
}



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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

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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.
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  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.