USN-8461-1 (UBUNTU-CVE-2026-43284)

Vulnerability from osv_ubuntu – Published: 2026-06-22 22:51 – Updated: 2026-07-06 18:13 – Source website
VLAI
Summary
linux-azure 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, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)

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, CVE-2026-46300)

Qualys discovered that a race condition existed in the ptrace subsystem of the Linux kernel when privileged processes are exiting. An unprivileged local attacker could use this issue to expose sensitive information. (CVE-2026-46333)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a memory leak when handling AppArmor notifications. A local attacker could use this to cause resource exhaustion. (CVE-2026-47326)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a NULL pointer dereference when handling AppArmor notifications. A local attacker could use this to cause a kernel oops. (CVE-2026-47327)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an invalid free when handling AppArmor notifications. A local attacker could use this to corrupt kernel memory. (CVE-2026-47328)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained insufficient validation of AppArmor notification responses. A local attacker could use this to allow crafted responses to be processed. (CVE-2026-47329)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used an uninitialized variable when handling AppArmor notifications. A local attacker could use this to cause incorrect caching of data. (CVE-2026-47330)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an out-of-bounds (OOB) read when handling AppArmor notifications. A local attacker could use this to cause information disclosure of kernel memory. (CVE-2026-47332)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a out-of-bounds (OOB) read when handling AppArmor notifications. A local attacker could use this to cause kernel memory corruption and, theoretically, influence processing of AppArmor policies. (CVE-2026-47333)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained incorrect holding of locks when handling AppArmor notifications. A local attacker could use this to cause a kernel panic or deadlock. (CVE-2026-47334)

Tristan Madani and Trevor Lawrence have each independently discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a NULL pointer dereference when handling AppArmor network socket mediation. A local attacker could use this to cause a kernel oops. (CVE-2026-47337)

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: - Networking core; - RDS protocol; (CVE-2026-43494, CVE-2026-46323)

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",
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                  "type": "CVSS_V3"
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                {
                  "score": "high",
                  "type": "Ubuntu"
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            },
            {
              "id": "CVE-2026-43494",
              "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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                  "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:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43500",
              "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": "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:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "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-2026-45998",
              "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": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46000",
              "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-2026-46300",
              "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": "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": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46323",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:H/AT:P/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: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": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46333",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "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": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47326",
              "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-2026-47327",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47328",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47329",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47330",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47332",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47333",
              "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": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-47334",
              "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-2026-47337",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-azure-cloud-tools-7.0.0-1007",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-azure-headers-7.0.0-1007",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-azure-tools-7.0.0-1007",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-buildinfo-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-cloud-tools-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-headers-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-image-unsigned-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-modules-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          },
          {
            "binary_name": "linux-tools-7.0.0-1007-azure",
            "binary_version": "7.0.0-1007.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "linux-azure",
        "purl": "pkg:deb/ubuntu/linux-azure@7.0.0-1007.7?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.0-1007.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.17.0-1003.3",
        "6.17.0-1004.4",
        "6.19.0-1001.1",
        "6.19.0-1002.2",
        "7.0.0-1001.1",
        "7.0.0-1002.2",
        "7.0.0-1003.3",
        "7.0.0-1004.4"
      ]
    }
  ],
  "aliases": [],
  "details": "\nIt 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, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)\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,\nCVE-2026-46300)\n\nQualys discovered that a race condition existed in the ptrace subsystem of\nthe Linux kernel when privileged processes are exiting. An unprivileged\nlocal attacker could use this issue to expose sensitive information.\n(CVE-2026-46333)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontain a memory leak when handling AppArmor notifications. A local\nattacker could use this to cause resource exhaustion. (CVE-2026-47326)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontain a NULL pointer dereference when handling AppArmor notifications. A\nlocal attacker could use this to cause a kernel oops. (CVE-2026-47327)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontained an invalid free when handling AppArmor notifications. A local\nattacker could use this to corrupt kernel memory. (CVE-2026-47328)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontained insufficient validation of AppArmor notification responses. A\nlocal attacker could use this to allow crafted responses to be processed.\n(CVE-2026-47329)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used\nan uninitialized variable when handling AppArmor notifications. A local\nattacker could use this to cause incorrect caching of data.\n(CVE-2026-47330)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontained an out-of-bounds (OOB) read when handling AppArmor notifications.\nA local attacker could use this to cause information disclosure of kernel\nmemory. (CVE-2026-47332)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontained a out-of-bounds (OOB) read when handling AppArmor notifications.\nA local attacker could use this to cause kernel memory corruption and,\ntheoretically, influence processing of AppArmor policies. (CVE-2026-47333)\n\nTristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0\ncontained incorrect holding of locks when handling AppArmor notifications.\nA local attacker could use this to cause a kernel panic or deadlock.\n(CVE-2026-47334)\n\nTristan Madani and Trevor Lawrence have each independently discovered that\nUbuntu Linux kernel 6.8, 6.17 and 7.0 contained a NULL pointer dereference\nwhen handling AppArmor network socket mediation. A local attacker could use\nthis to cause a kernel oops. (CVE-2026-47337)\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  - Networking core;\n  - RDS protocol;\n(CVE-2026-43494, CVE-2026-46323)\n",
  "id": "USN-8461-1",
  "modified": "2026-07-06T18:13:25Z",
  "published": "2026-06-22T22:51:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8461-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43284"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43494"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43500"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43503"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-45998"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46000"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46300"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46323"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46333"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47326"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47327"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47328"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47329"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47330"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47332"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47333"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47334"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47337"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-azure vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-43284",
    "UBUNTU-CVE-2026-43494",
    "UBUNTU-CVE-2026-43500",
    "UBUNTU-CVE-2026-43503",
    "UBUNTU-CVE-2026-45998",
    "UBUNTU-CVE-2026-46000",
    "UBUNTU-CVE-2026-46300",
    "UBUNTU-CVE-2026-46323",
    "UBUNTU-CVE-2026-46333",
    "UBUNTU-CVE-2026-47326",
    "UBUNTU-CVE-2026-47327",
    "UBUNTU-CVE-2026-47328",
    "UBUNTU-CVE-2026-47329",
    "UBUNTU-CVE-2026-47330",
    "UBUNTU-CVE-2026-47332",
    "UBUNTU-CVE-2026-47333",
    "UBUNTU-CVE-2026-47334",
    "UBUNTU-CVE-2026-47337"
  ]
}



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