usn-7861-4
Vulnerability from osv_ubuntu
Published
2025-11-19 21:06
Modified
2026-07-13 09:29
Summary
linux-aws-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. (CVE-2025-40300)

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:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-aws-6.8-cloud-tools-6.8.0-1042",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-aws-6.8-headers-6.8.0-1042",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-aws-6.8-tools-6.8.0-1042",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-buildinfo-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-buildinfo-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-headers-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-headers-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-modules-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-modules-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-tools-6.8.0-1042-aws",
            "binary_version": "6.8.0-1042.44~22.04.1"
          },
          {
            "binary_name": "linux-tools-6.8.0-1042-aws-64k",
            "binary_version": "6.8.0-1042.44~22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "linux-aws-6.8",
        "purl": "pkg:deb/ubuntu/linux-aws-6.8@6.8.0-1042.44~22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.8.0-1042.44~22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.8.0-1009.9~22.04.2",
        "6.8.0-1010.10~22.04.2",
        "6.8.0-1011.12~22.04.1",
        "6.8.0-1013.14~22.04.1",
        "6.8.0-1014.15~22.04.1",
        "6.8.0-1015.16~22.04.1",
        "6.8.0-1016.17~22.04.2",
        "6.8.0-1017.18~22.04.1",
        "6.8.0-1018.19~22.04.1",
        "6.8.0-1019.21~22.04.1",
        "6.8.0-1020.22~22.04.1",
        "6.8.0-1021.23~22.04.1",
        "6.8.0-1023.25~22.04.1",
        "6.8.0-1024.26~22.04.1",
        "6.8.0-1027.29~22.04.1",
        "6.8.0-1028.30~22.04.1",
        "6.8.0-1029.31~22.04.1",
        "6.8.0-1030.32~22.04.1",
        "6.8.0-1031.33~22.04.1",
        "6.8.0-1032.34~22.04.1",
        "6.8.0-1033.35~22.04.1",
        "6.8.0-1035.37~22.04.1",
        "6.8.0-1036.38~22.04.1",
        "6.8.0-1039.41~22.04.1",
        "6.8.0-1040.42~22.04.1",
        "6.8.0-1041.43~22.04.1"
      ]
    }
  ],
  "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. (CVE-2025-40300)\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-7861-4",
  "modified": "2026-07-13T09:29:26Z",
  "published": "2025-11-19T21:06:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7861-4"
    },
    {
      "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-aws-6.8 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2025-37838",
    "UBUNTU-CVE-2025-38118",
    "UBUNTU-CVE-2025-38352",
    "UBUNTU-CVE-2025-40300"
  ]
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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