USN-7861-2

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Source
https://ubuntu.com/security/notices/USN-7861-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7861-2.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-7861-2
Upstream
Related
Published
2025-11-07T09:08:23.772817Z
Modified
2025-11-10T07:18:25.178380Z
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

Affected packages

Ubuntu:Pro:22.04:LTS:Realtime:Kernel / linux-realtime-6.8

Package

Name
linux-realtime-6.8
Purl
pkg:deb/ubuntu/linux-realtime-6.8@6.8.1-1037.38~22.04.1?arch=source&distro=realtime/jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.8.1-1037.38~22.04.1

Affected versions

6.*

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

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"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:22.04:LTS:Realtime:Kernel",
    "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": "high",
                    "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": "high",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:Pro:24.04:LTS:Realtime:Kernel / linux-realtime

Package

Name
linux-realtime
Purl
pkg:deb/ubuntu/linux-realtime@6.8.1-1037.38?arch=source&distro=realtime/noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.8.1-1037.38

Affected versions

6.*

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

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"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:24.04:LTS:Realtime:Kernel",
    "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": "high",
                    "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": "high",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}