USN-7939-1

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: - Cryptographic API; - ACPI drivers; - HSI subsystem; - I3C subsystem; - InfiniBand drivers; - Media drivers; - Network drivers; - Pin controllers subsystem; - AFS file system; - F2FS file system; - SMB network file system; - Padata parallel execution mechanism; - Timer subsystem; - Tracing infrastructure; - Memory management; - Appletalk network protocol; - Networking core; - Netfilter; (CVE-2022-49026, CVE-2022-49390, CVE-2023-52854, CVE-2024-35867, CVE-2024-47691, CVE-2024-49935, CVE-2024-50061, CVE-2024-50067, CVE-2024-50095, CVE-2024-50196, CVE-2024-53090, CVE-2024-53218, CVE-2024-56664, CVE-2025-21727, CVE-2025-21855, CVE-2025-37838, CVE-2025-37958, CVE-2025-38352, CVE-2025-38666, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018)

References

https://ubuntu.com/security/notices/USN-7939-1

Affected packages

Ubuntu:Pro:18.04:LTS / linux-azure-5.4

Package

Name: linux-azure-5.4
Purl: pkg:deb/ubuntu/linux-azure-5.4@5.4.0-1156.163~18.04.1?arch=source&distro=esm-infra/bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.4.0-1156.163~18.04.1

Affected versions

5.*

5.4.0-1020.20~18.04.1

5.4.0-1022.22~18.04.1

5.4.0-1023.23~18.04.1

5.4.0-1025.25~18.04.1

5.4.0-1026.26~18.04.1

5.4.0-1031.32~18.04.1

5.4.0-1032.33~18.04.1

5.4.0-1034.35~18.04.1

5.4.0-1035.36~18.04.1

5.4.0-1036.38~18.04.1

5.4.0-1039.41~18.04.1

5.4.0-1040.42~18.04.1

5.4.0-1041.43~18.04.1

5.4.0-1043.45~18.04.1

5.4.0-1044.46~18.04.1

5.4.0-1046.48~18.04.1

5.4.0-1047.49~18.04.1

5.4.0-1048.50~18.04.1

5.4.0-1049.51~18.04.1

5.4.0-1051.53~18.04.1

5.4.0-1055.57~18.04.1

5.4.0-1056.58~18.04.1

5.4.0-1058.60~18.04.1

5.4.0-1059.62~18.04.1

5.4.0-1061.64~18.04.1

5.4.0-1062.65~18.04.1

5.4.0-1063.66~18.04.1

5.4.0-1064.67~18.04.1

5.4.0-1065.68~18.04.1

5.4.0-1067.70~18.04.1

5.4.0-1068.71~18.04.1

5.4.0-1069.72~18.04.1

5.4.0-1070.73~18.04.1

5.4.0-1072.75~18.04.1

5.4.0-1073.76~18.04.1

5.4.0-1074.77~18.04.1

5.4.0-1077.80~18.04.1

5.4.0-1078.81~18.04.1

5.4.0-1080.83~18.04.2

5.4.0-1083.87~18.04.1

5.4.0-1085.90~18.04.1

5.4.0-1086.91~18.04.1

5.4.0-1089.94~18.04.1

5.4.0-1090.95~18.04.1

5.4.0-1091.96~18.04.1

5.4.0-1094.100~18.04.1

5.4.0-1095.101~18.04.1

5.4.0-1098.104~18.04.2

5.4.0-1100.106~18.04.1

5.4.0-1101.107~18.04.1

5.4.0-1103.109~18.04.1

5.4.0-1104.110~18.04.1

5.4.0-1105.111~18.04.1

5.4.0-1106.112~18.04.1

5.4.0-1107.113~18.04.1

5.4.0-1108.114~18.04.1

5.4.0-1109.115~18.04.1

5.4.0-1110.116~18.04.1

5.4.0-1111.117~18.04.1

5.4.0-1112.118~18.04.1

5.4.0-1113.119~18.04.1

5.4.0-1115.122~18.04.1

5.4.0-1116.123~18.04.1

5.4.0-1117.124~18.04.1

5.4.0-1118.125~18.04.1

5.4.0-1119.126~18.04.2

5.4.0-1120.127~18.04.1

5.4.0-1121.128~18.04.1

5.4.0-1122.129~18.04.1

5.4.0-1123.130~18.04.1

5.4.0-1124.131~18.04.1

5.4.0-1126.133~18.04.1

5.4.0-1127.134~18.04.1

5.4.0-1128.135~18.04.1

5.4.0-1129.136~18.04.1

5.4.0-1130.137~18.04.1

5.4.0-1131.138~18.04.1

5.4.0-1132.139~18.04.1

5.4.0-1133.140~18.04.1

5.4.0-1134.141~18.04.1

5.4.0-1135.142~18.04.1

5.4.0-1136.143~18.04.1

5.4.0-1137.144~18.04.1

5.4.0-1138.145~18.04.1

5.4.0-1139.146~18.04.1

5.4.0-1140.147~18.04.1

5.4.0-1142.149~18.04.1

5.4.0-1143.150~18.04.1

5.4.0-1145.152~18.04.1

5.4.0-1147.154~18.04.1

5.4.0-1148.155~18.04.1

5.4.0-1149.156~18.04.1

5.4.0-1150.157~18.04.1

5.4.0-1151.158~18.04.1

5.4.0-1152.159~18.04.1

5.4.0-1153.160~18.04.1

5.4.0-1154.161~18.04.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "linux-azure-5.4-cloud-tools-5.4.0-1156",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-azure-5.4-headers-5.4.0-1156",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-azure-5.4-tools-5.4.0-1156",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-buildinfo-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-cloud-tools-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-headers-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-image-unsigned-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-modules-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-modules-extra-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        },
        {
            "binary_name": "linux-tools-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163~18.04.1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "cves": [],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7939-1.json"

Ubuntu:Pro:20.04:LTS / linux-azure

Package

Name: linux-azure
Purl: pkg:deb/ubuntu/linux-azure@5.4.0-1156.163?arch=source&distro=esm-infra/focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.4.0-1156.163

Affected versions

5.*

5.3.0-1003.3

5.3.0-1008.9

5.3.0-1009.10

5.4.0-1006.6

5.4.0-1008.8

5.4.0-1009.9

5.4.0-1010.10

5.4.0-1012.12

5.4.0-1016.16

5.4.0-1019.19

5.4.0-1020.20

5.4.0-1022.22

5.4.0-1023.23

5.4.0-1025.25

5.4.0-1026.26

5.4.0-1031.32

5.4.0-1032.33

5.4.0-1034.35

5.4.0-1035.36

5.4.0-1036.38

5.4.0-1039.41

5.4.0-1040.42

5.4.0-1041.43

5.4.0-1043.45

5.4.0-1044.46

5.4.0-1046.48

5.4.0-1047.49

5.4.0-1048.50

5.4.0-1049.51

5.4.0-1051.53

5.4.0-1055.57

5.4.0-1056.58

5.4.0-1058.60

5.4.0-1059.62

5.4.0-1061.64

5.4.0-1062.65

5.4.0-1063.66

5.4.0-1064.67

5.4.0-1065.68

5.4.0-1067.70

5.4.0-1068.71

5.4.0-1069.72

5.4.0-1070.73

5.4.0-1072.75

5.4.0-1073.76

5.4.0-1074.77

5.4.0-1077.80

5.4.0-1078.81

5.4.0-1080.83

5.4.0-1083.87

5.4.0-1085.90

5.4.0-1086.91

5.4.0-1089.94

5.4.0-1090.95

5.4.0-1091.96

5.4.0-1094.100

5.4.0-1095.101

5.4.0-1098.104

5.4.0-1100.106

5.4.0-1101.107

5.4.0-1103.109

5.4.0-1104.110

5.4.0-1105.111

5.4.0-1106.112

5.4.0-1107.113

5.4.0-1108.114

5.4.0-1109.115

5.4.0-1110.116

5.4.0-1111.117

5.4.0-1112.118

5.4.0-1113.119

5.4.0-1114.120

5.4.0-1115.122

5.4.0-1116.123

5.4.0-1117.124

5.4.0-1118.125

5.4.0-1119.126

5.4.0-1120.127

5.4.0-1121.128

5.4.0-1122.129

5.4.0-1123.130

5.4.0-1124.131

5.4.0-1126.133

5.4.0-1127.134

5.4.0-1128.135

5.4.0-1129.136

5.4.0-1130.137

5.4.0-1131.138

5.4.0-1132.139

5.4.0-1133.140

5.4.0-1134.141

5.4.0-1135.142

5.4.0-1136.143

5.4.0-1137.144

5.4.0-1138.145

5.4.0-1139.146

5.4.0-1140.147

5.4.0-1142.149

5.4.0-1143.150

5.4.0-1145.152

5.4.0-1147.154

5.4.0-1148.155

5.4.0-1149.156

5.4.0-1150.157

5.4.0-1151.158

5.4.0-1152.159

5.4.0-1153.160

5.4.0-1154.161

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "linux-azure-cloud-tools-5.4.0-1156",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-azure-headers-5.4.0-1156",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-azure-tools-5.4.0-1156",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-buildinfo-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-cloud-tools-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-headers-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-image-unsigned-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-modules-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-modules-extra-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        },
        {
            "binary_name": "linux-tools-5.4.0-1156-azure",
            "binary_version": "5.4.0-1156.163"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "cves": [],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7939-1.json"