usn-7861-2
Vulnerability from osv_ubuntu
Published
2025-11-07 09:08
Modified
2026-07-13 09:29
Summary
linux-realtime, linux-realtime-6.8 vulnerabilities
Details

Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS.

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: - HSI subsystem; - Bluetooth subsystem; - Timer subsystem; (CVE-2025-37838, CVE-2025-38118, CVE-2025-38352)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2025-37838",
              "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-2025-38118",
              "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": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-38352",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-40300",
              "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": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:Realtime:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-headers-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-modules-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-modules-iwlwifi-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-realtime-6.8-cloud-tools-6.8.1-1037",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-realtime-6.8-headers-6.8.1-1037",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-realtime-6.8-tools-6.8.1-1037",
            "binary_version": "6.8.1-1037.38~22.04.1"
          },
          {
            "binary_name": "linux-tools-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38~22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:Realtime:22.04:LTS",
        "name": "linux-realtime-6.8",
        "purl": "pkg:deb/ubuntu/linux-realtime-6.8@6.8.1-1037.38~22.04.1?arch=source\u0026distro=realtime/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.8.1-1037.38~22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.8.1-1004.4~22.04.1",
        "6.8.1-1005.5~22.04.2",
        "6.8.1-1006.6~22.04.1",
        "6.8.1-1007.7~22.04.1",
        "6.8.1-1008.8~22.04.1",
        "6.8.1-1009.9~22.04.1",
        "6.8.1-1010.10~22.04.1",
        "6.8.1-1011.11~22.04.1",
        "6.8.1-1012.12~22.04.1",
        "6.8.1-1013.14~22.04.1",
        "6.8.1-1014.15~22.04.1",
        "6.8.1-1015.16~22.04.1",
        "6.8.1-1016.17~22.04.1",
        "6.8.1-1017.18~22.04.1",
        "6.8.1-1018.19~22.04.1",
        "6.8.1-1019.20~22.04.1",
        "6.8.1-1020.21~22.04.1",
        "6.8.1-1021.22~22.04.1",
        "6.8.1-1022.23~22.04.1",
        "6.8.1-1023.24~22.04.1",
        "6.8.1-1024.25~22.04.1",
        "6.8.1-1025.26~22.04.1",
        "6.8.1-1026.27~22.04.1",
        "6.8.1-1030.31~22.04.1",
        "6.8.1-1031.32~22.04.1",
        "6.8.1-1034.35~22.04.1",
        "6.8.1-1035.36~22.04.1",
        "6.8.1-1036.37~22.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2025-37838",
              "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-2025-38118",
              "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": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-38352",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-40300",
              "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": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:Realtime:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-cloud-tools-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-headers-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-image-unsigned-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-modules-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-modules-extra-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-modules-iwlwifi-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-realtime-cloud-tools-6.8.1-1037",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-realtime-headers-6.8.1-1037",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-realtime-tools-6.8.1-1037",
            "binary_version": "6.8.1-1037.38"
          },
          {
            "binary_name": "linux-tools-6.8.1-1037-realtime",
            "binary_version": "6.8.1-1037.38"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:Realtime:24.04:LTS",
        "name": "linux-realtime",
        "purl": "pkg:deb/ubuntu/linux-realtime@6.8.1-1037.38?arch=source\u0026distro=realtime/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.8.1-1037.38"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.8.0-1008.19",
        "6.8.1-1001.1",
        "6.8.1-1002.2",
        "6.8.1-1003.3",
        "6.8.1-1004.4",
        "6.8.1-1005.5",
        "6.8.1-1006.6",
        "6.8.1-1007.7",
        "6.8.1-1008.8",
        "6.8.1-1009.9",
        "6.8.1-1010.10",
        "6.8.1-1011.11",
        "6.8.1-1012.12",
        "6.8.1-1013.14",
        "6.8.1-1014.15",
        "6.8.1-1015.16",
        "6.8.1-1016.17",
        "6.8.1-1017.18",
        "6.8.1-1018.19",
        "6.8.1-1019.20",
        "6.8.1-1020.21",
        "6.8.1-1021.22",
        "6.8.1-1022.23",
        "6.8.1-1023.24",
        "6.8.1-1024.25",
        "6.8.1-1025.26",
        "6.8.1-1026.27",
        "6.8.1-1030.31",
        "6.8.1-1031.32",
        "6.8.1-1033.34",
        "6.8.1-1034.35",
        "6.8.1-1035.36",
        "6.8.1-1036.37"
      ]
    }
  ],
  "aliases": [],
  "details": "Jean-Claude Graf, Sandro R\u00fcegge, Ali Hajiabadi, and Kaveh Razavi discovered\nthat the Linux kernel contained insufficient branch predictor isolation\nbetween a guest and a userspace hypervisor for certain processors. This\nflaw is known as VMSCAPE. An attacker in a guest VM could possibly use this\nto expose sensitive information from the host OS.\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  - HSI subsystem;\n  - Bluetooth subsystem;\n  - Timer subsystem;\n(CVE-2025-37838, CVE-2025-38118, CVE-2025-38352)\n",
  "id": "USN-7861-2",
  "modified": "2026-07-13T09:29:26Z",
  "published": "2025-11-07T09:08:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7861-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-37838"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-38118"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-38352"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-40300"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-realtime, linux-realtime-6.8 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2025-37838",
    "UBUNTU-CVE-2025-38118",
    "UBUNTU-CVE-2025-38352",
    "UBUNTU-CVE-2025-40300"
  ]
}



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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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