usn-8617-1
Vulnerability from osv_ubuntu
Published
2026-07-28 06:46
Modified
2026-07-28 06:46
Summary
linux-kvm vulnerabilities
Details

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; - STMicroelectronics network drivers; - SCSI subsystem; - USB over IP driver; - SMB network file system; - Tracing infrastructure; - B.A.T.M.A.N. meshing protocol; - Ethernet bridge; - Ceph Core library; - IPv4 networking; - IPv6 networking; - Netfilter; - RxRPC session sockets; - X.25 network layer; (CVE-2026-23272, CVE-2026-23455, CVE-2026-31418, CVE-2026-31607, CVE-2026-31637, CVE-2026-31649, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43038, CVE-2026-43117, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-46043, CVE-2026-46243)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "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-2026-31418",
              "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-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"
                }
              ]
            },
            {
              "id": "CVE-2026-31649",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                },
                {
                  "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-2026-31682",
              "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"
                }
              ]
            },
            {
              "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-2026-43038",
              "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-2026-43117",
              "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:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "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",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/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"
                }
              ]
            },
            {
              "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-2026-46243",
              "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"
                },
                {
                  "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:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-5.4.0-1148-kvm",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-headers-5.4.0-1148-kvm",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-image-unsigned-5.4.0-1148-kvm",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-kvm-headers-5.4.0-1148",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-kvm-tools-5.4.0-1148",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-modules-5.4.0-1148-kvm",
            "binary_version": "5.4.0-1148.157"
          },
          {
            "binary_name": "linux-tools-5.4.0-1148-kvm",
            "binary_version": "5.4.0-1148.157"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-kvm",
        "purl": "pkg:deb/ubuntu/linux-kvm@5.4.0-1148.157?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1148.157"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-1003.3",
        "5.3.0-1008.9",
        "5.3.0-1009.10",
        "5.4.0-1004.4",
        "5.4.0-1006.6",
        "5.4.0-1007.7",
        "5.4.0-1008.8",
        "5.4.0-1009.9",
        "5.4.0-1011.11",
        "5.4.0-1015.15",
        "5.4.0-1018.18",
        "5.4.0-1020.20",
        "5.4.0-1021.21",
        "5.4.0-1023.23",
        "5.4.0-1024.24",
        "5.4.0-1026.27",
        "5.4.0-1028.29",
        "5.4.0-1030.31",
        "5.4.0-1031.32",
        "5.4.0-1032.33",
        "5.4.0-1033.34",
        "5.4.0-1034.35",
        "5.4.0-1036.37",
        "5.4.0-1037.38",
        "5.4.0-1038.39",
        "5.4.0-1039.40",
        "5.4.0-1040.41",
        "5.4.0-1041.42",
        "5.4.0-1044.46",
        "5.4.0-1045.47",
        "5.4.0-1046.48",
        "5.4.0-1047.49",
        "5.4.0-1048.50",
        "5.4.0-1049.51",
        "5.4.0-1050.52",
        "5.4.0-1051.53",
        "5.4.0-1053.55",
        "5.4.0-1054.56",
        "5.4.0-1055.57",
        "5.4.0-1056.58",
        "5.4.0-1058.61",
        "5.4.0-1059.62",
        "5.4.0-1061.64",
        "5.4.0-1062.65",
        "5.4.0-1063.66",
        "5.4.0-1065.68",
        "5.4.0-1068.72",
        "5.4.0-1070.75",
        "5.4.0-1071.76",
        "5.4.0-1073.78",
        "5.4.0-1074.79",
        "5.4.0-1075.80",
        "5.4.0-1076.81",
        "5.4.0-1078.84",
        "5.4.0-1079.85",
        "5.4.0-1082.88",
        "5.4.0-1083.89",
        "5.4.0-1084.90",
        "5.4.0-1086.92",
        "5.4.0-1087.93",
        "5.4.0-1088.94",
        "5.4.0-1089.95",
        "5.4.0-1090.96",
        "5.4.0-1091.97",
        "5.4.0-1092.98",
        "5.4.0-1093.99",
        "5.4.0-1094.100",
        "5.4.0-1095.101",
        "5.4.0-1096.102",
        "5.4.0-1097.103",
        "5.4.0-1098.104",
        "5.4.0-1099.105",
        "5.4.0-1100.106",
        "5.4.0-1101.107",
        "5.4.0-1102.108",
        "5.4.0-1103.110",
        "5.4.0-1104.111",
        "5.4.0-1105.112",
        "5.4.0-1106.113",
        "5.4.0-1107.114",
        "5.4.0-1108.115",
        "5.4.0-1109.116",
        "5.4.0-1110.117",
        "5.4.0-1111.118",
        "5.4.0-1112.119",
        "5.4.0-1113.120",
        "5.4.0-1114.121",
        "5.4.0-1115.122",
        "5.4.0-1116.123",
        "5.4.0-1117.124",
        "5.4.0-1118.125",
        "5.4.0-1119.127",
        "5.4.0-1120.128",
        "5.4.0-1121.129",
        "5.4.0-1122.130",
        "5.4.0-1123.131",
        "5.4.0-1124.132",
        "5.4.0-1125.133",
        "5.4.0-1126.134",
        "5.4.0-1127.136",
        "5.4.0-1129.138",
        "5.4.0-1130.139",
        "5.4.0-1131.140",
        "5.4.0-1132.141",
        "5.4.0-1133.142",
        "5.4.0-1134.143",
        "5.4.0-1135.144",
        "5.4.0-1136.145",
        "5.4.0-1137.146",
        "5.4.0-1138.147",
        "5.4.0-1139.148",
        "5.4.0-1140.149",
        "5.4.0-1141.150",
        "5.4.0-1143.152",
        "5.4.0-1144.153",
        "5.4.0-1145.154",
        "5.4.0-1146.155",
        "5.4.0-1147.156"
      ]
    }
  ],
  "aliases": [],
  "details": "It 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  - STMicroelectronics network drivers;\n  - SCSI subsystem;\n  - USB over IP driver;\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  - IPv4 networking;\n  - IPv6 networking;\n  - Netfilter;\n  - RxRPC session sockets;\n  - X.25 network layer;\n(CVE-2026-23272, CVE-2026-23455, CVE-2026-31418, CVE-2026-31607,\nCVE-2026-31637, CVE-2026-31649, CVE-2026-31659, CVE-2026-31682,\nCVE-2026-31685, CVE-2026-43011, CVE-2026-43038, CVE-2026-43117,\nCVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-46043,\nCVE-2026-46243)\n",
  "id": "USN-8617-1",
  "modified": "2026-07-28T06:46:54Z",
  "published": "2026-07-28T06:46:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8617-1"
    },
    {
      "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-2026-31418"
    },
    {
      "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-2026-31649"
    },
    {
      "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-2026-43038"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43117"
    },
    {
      "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-2026-46043"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46243"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-kvm vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-23272",
    "UBUNTU-CVE-2026-23455",
    "UBUNTU-CVE-2026-31418",
    "UBUNTU-CVE-2026-31607",
    "UBUNTU-CVE-2026-31637",
    "UBUNTU-CVE-2026-31649",
    "UBUNTU-CVE-2026-31659",
    "UBUNTU-CVE-2026-31682",
    "UBUNTU-CVE-2026-31685",
    "UBUNTU-CVE-2026-43011",
    "UBUNTU-CVE-2026-43038",
    "UBUNTU-CVE-2026-43117",
    "UBUNTU-CVE-2026-43383",
    "UBUNTU-CVE-2026-43407",
    "UBUNTU-CVE-2026-43414",
    "UBUNTU-CVE-2026-43503",
    "UBUNTU-CVE-2026-46043",
    "UBUNTU-CVE-2026-46243"
  ]
}



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Tags
Taxonomy of the tags.





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.