USN-8361-3

A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system. This update corrects flaws in the following subsystem: - Packet sockets; (CVE-2026-31504)

References

Affected packages

Ubuntu:Pro:16.04:LTS / linux

Package

Name: linux
Purl: pkg:deb/ubuntu/linux?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.4.0-281.315

Affected versions

4.*

4.2.0-16.19

4.2.0-17.21

4.2.0-19.23

4.3.0-1.10

4.3.0-2.11

4.3.0-5.16

4.3.0-6.17

4.3.0-7.18

4.4.0-2.16

4.4.0-4.19

4.4.0-6.21

4.4.0-7.22

4.4.0-8.23

4.4.0-9.24

4.4.0-10.25

4.4.0-11.26

4.4.0-12.28

4.4.0-13.29

4.4.0-14.30

4.4.0-15.31

4.4.0-16.32

4.4.0-17.33

4.4.0-18.34

4.4.0-21.37

4.4.0-22.39

4.4.0-22.40

4.4.0-24.43

4.4.0-28.47

4.4.0-31.50

4.4.0-34.53

4.4.0-36.55

4.4.0-38.57

4.4.0-42.62

4.4.0-43.63

4.4.0-45.66

4.4.0-47.68

4.4.0-51.72

4.4.0-53.74

4.4.0-57.78

4.4.0-59.80

4.4.0-62.83

4.4.0-63.84

4.4.0-64.85

4.4.0-65.86

4.4.0-66.87

4.4.0-67.88

4.4.0-70.91

4.4.0-71.92

4.4.0-72.93

4.4.0-75.96

4.4.0-77.98

4.4.0-78.99

4.4.0-79.100

4.4.0-81.104

4.4.0-83.106

4.4.0-87.110

4.4.0-89.112

4.4.0-91.114

4.4.0-92.115

4.4.0-93.116

4.4.0-96.119

4.4.0-97.120

4.4.0-98.121

4.4.0-101.124

4.4.0-103.126

4.4.0-104.127

4.4.0-108.131

4.4.0-109.132

4.4.0-112.135

4.4.0-116.140

4.4.0-119.143

4.4.0-121.145

4.4.0-122.146

4.4.0-124.148

4.4.0-127.153

4.4.0-128.154

4.4.0-130.156

4.4.0-131.157

4.4.0-133.159

4.4.0-134.160

4.4.0-135.161

4.4.0-137.163

4.4.0-138.164

4.4.0-139.165

4.4.0-140.166

4.4.0-141.167

4.4.0-142.168

4.4.0-143.169

4.4.0-145.171

4.4.0-146.172

4.4.0-148.174

4.4.0-150.176

4.4.0-151.178

4.4.0-154.181

4.4.0-157.185

4.4.0-159.187

4.4.0-161.189

4.4.0-164.192

4.4.0-165.193

4.4.0-166.195

4.4.0-168.197

4.4.0-169.198

4.4.0-170.199

4.4.0-171.200

4.4.0-173.203

4.4.0-174.204

4.4.0-176.206

4.4.0-177.207

4.4.0-178.208

4.4.0-179.209

4.4.0-184.214

4.4.0-185.215

4.4.0-186.216

4.4.0-187.217

4.4.0-189.219

4.4.0-190.220

4.4.0-193.224

4.4.0-194.226

4.4.0-197.229

4.4.0-198.230

4.4.0-200.232

4.4.0-201.233

4.4.0-203.235

4.4.0-204.236

4.4.0-206.238

4.4.0-208.240

4.4.0-209.241

4.4.0-210.242

4.4.0-211.243

4.4.0-212.244

4.4.0-213.245

4.4.0-214.246

4.4.0-216.249

4.4.0-217.250

4.4.0-218.251

4.4.0-219.252

4.4.0-221.254

4.4.0-222.255

4.4.0-223.256

4.4.0-224.257

4.4.0-227.261

4.4.0-229.263

4.4.0-230.264

4.4.0-231.265

4.4.0-233.267

4.4.0-234.268

4.4.0-235.269

4.4.0-236.270

4.4.0-237.271

4.4.0-239.273

4.4.0-240.274

4.4.0-241.275

4.4.0-242.276

4.4.0-243.277

4.4.0-244.278

4.4.0-245.279

4.4.0-246.280

4.4.0-248.282

4.4.0-250.284

4.4.0-251.285

4.4.0-252.286

4.4.0-253.287

4.4.0-254.288

4.4.0-256.290

4.4.0-257.291

4.4.0-258.292

4.4.0-259.293

4.4.0-260.294

4.4.0-261.295

4.4.0-262.296

4.4.0-263.297

4.4.0-264.298

4.4.0-266.300

4.4.0-267.301

4.4.0-268.302

4.4.0-269.303

4.4.0-270.304

4.4.0-271.305

4.4.0-272.306

4.4.0-273.307

4.4.0-274.308

4.4.0-276.310

4.4.0-277.311

4.4.0-278.312

4.4.0-279.313

4.4.0-280.314

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-buildinfo-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-buildinfo-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-cloud-tools-4.4.0-281"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-cloud-tools-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-cloud-tools-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-cloud-tools-common"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-headers-4.4.0-281"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-headers-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-headers-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-image-unsigned-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-image-unsigned-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-modules-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-modules-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-modules-extra-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-source-4.4.0"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-tools-4.4.0-281"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-tools-4.4.0-281-generic"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-tools-4.4.0-281-lowlatency"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-tools-common"
        },
        {
            "binary_version": "4.4.0-281.315",
            "binary_name": "linux-tools-host"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8361-3.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-31504",
            "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"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}

Ubuntu:Pro:16.04:LTS / linux-aws

Package

Name: linux-aws
Purl: pkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.4.0-1193.208

Affected versions

4.*

4.4.0-1001.10

4.4.0-1003.12

4.4.0-1004.13

4.4.0-1007.16

4.4.0-1009.18

4.4.0-1011.20

4.4.0-1012.21

4.4.0-1013.22

4.4.0-1016.25

4.4.0-1017.26

4.4.0-1018.27

4.4.0-1020.29

4.4.0-1022.31

4.4.0-1026.35

4.4.0-1028.37

4.4.0-1030.39

4.4.0-1031.40

4.4.0-1032.41

4.4.0-1035.44

4.4.0-1037.46

4.4.0-1038.47

4.4.0-1039.48

4.4.0-1041.50

4.4.0-1043.52

4.4.0-1044.53

4.4.0-1047.56

4.4.0-1048.57

4.4.0-1049.58

4.4.0-1050.59

4.4.0-1052.61

4.4.0-1054.63

4.4.0-1055.64

4.4.0-1057.66

4.4.0-1060.69

4.4.0-1061.70

4.4.0-1062.71

4.4.0-1063.72

4.4.0-1065.75

4.4.0-1066.76

4.4.0-1067.77

4.4.0-1069.79

4.4.0-1070.80

4.4.0-1072.82

4.4.0-1073.83

4.4.0-1074.84

4.4.0-1075.85

4.4.0-1077.87

4.4.0-1079.89

4.4.0-1081.91

4.4.0-1083.93

4.4.0-1084.94

4.4.0-1085.96

4.4.0-1087.98

4.4.0-1088.99

4.4.0-1090.101

4.4.0-1092.103

4.4.0-1094.105

4.4.0-1095.106

4.4.0-1096.107

4.4.0-1098.109

4.4.0-1099.110

4.4.0-1100.111

4.4.0-1101.112

4.4.0-1102.113

4.4.0-1104.115

4.4.0-1105.116

4.4.0-1106.117

4.4.0-1107.118

4.4.0-1109.120

4.4.0-1110.121

4.4.0-1111.123

4.4.0-1112.124

4.4.0-1113.126

4.4.0-1114.127

4.4.0-1117.131

4.4.0-1118.132

4.4.0-1119.133

4.4.0-1121.135

4.4.0-1122.136

4.4.0-1123.137

4.4.0-1124.138

4.4.0-1126.140

4.4.0-1127.141

4.4.0-1128.142

4.4.0-1129.143

4.4.0-1130.144

4.4.0-1131.145

4.4.0-1132.146

4.4.0-1133.147

4.4.0-1134.148

4.4.0-1135.149

4.4.0-1137.151

4.4.0-1138.152

4.4.0-1139.153

4.4.0-1140.154

4.4.0-1143.158

4.4.0-1145.160

4.4.0-1146.161

4.4.0-1147.162

4.4.0-1148.163

4.4.0-1150.165

4.4.0-1151.166

4.4.0-1152.167

4.4.0-1153.168

4.4.0-1154.169

4.4.0-1155.170

4.4.0-1156.171

4.4.0-1157.172

4.4.0-1158.173

4.4.0-1159.174

4.4.0-1160.175

4.4.0-1161.176

4.4.0-1162.177

4.4.0-1163.178

4.4.0-1164.179

4.4.0-1165.180

4.4.0-1166.181

4.4.0-1167.182

4.4.0-1168.183

4.4.0-1169.184

4.4.0-1171.186

4.4.0-1172.187

4.4.0-1173.188

4.4.0-1174.189

4.4.0-1175.190

4.4.0-1176.191

4.4.0-1177.192

4.4.0-1178.193

4.4.0-1179.194

4.4.0-1180.195

4.4.0-1181.196

4.4.0-1182.197

4.4.0-1183.198

4.4.0-1184.199

4.4.0-1185.200

4.4.0-1186.201

4.4.0-1187.202

4.4.0-1188.203

4.4.0-1189.204

4.4.0-1190.205

4.4.0-1191.206

4.4.0-1192.207

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-aws-cloud-tools-4.4.0-1193"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-aws-headers-4.4.0-1193"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-aws-tools-4.4.0-1193"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-buildinfo-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-cloud-tools-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-headers-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-image-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-modules-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-modules-extra-4.4.0-1193-aws"
        },
        {
            "binary_version": "4.4.0-1193.208",
            "binary_name": "linux-tools-4.4.0-1193-aws"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8361-3.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-31504",
            "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"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}

Ubuntu:Pro:16.04:LTS / linux-kvm

Package

Name: linux-kvm
Purl: pkg:deb/ubuntu/linux-kvm?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.4.0-1156.167

Affected versions

4.*

4.4.0-1004.9

4.4.0-1007.12

4.4.0-1008.13

4.4.0-1009.14

4.4.0-1010.15

4.4.0-1012.17

4.4.0-1013.18

4.4.0-1015.20

4.4.0-1017.22

4.4.0-1019.24

4.4.0-1020.25

4.4.0-1021.26

4.4.0-1023.28

4.4.0-1026.31

4.4.0-1027.32

4.4.0-1029.34

4.4.0-1031.37

4.4.0-1032.38

4.4.0-1033.39

4.4.0-1035.41

4.4.0-1036.42

4.4.0-1037.43

4.4.0-1038.44

4.4.0-1039.45

4.4.0-1040.46

4.4.0-1041.47

4.4.0-1043.49

4.4.0-1044.50

4.4.0-1046.52

4.4.0-1047.53

4.4.0-1048.55

4.4.0-1051.58

4.4.0-1052.59

4.4.0-1054.61

4.4.0-1056.63

4.4.0-1058.65

4.4.0-1059.66

4.4.0-1060.67

4.4.0-1062.69

4.4.0-1063.70

4.4.0-1064.71

4.4.0-1065.72

4.4.0-1066.73

4.4.0-1068.75

4.4.0-1069.76

4.4.0-1070.77

4.4.0-1071.78

4.4.0-1075.82

4.4.0-1076.83

4.4.0-1077.84

4.4.0-1078.85

4.4.0-1079.86

4.4.0-1080.87

4.4.0-1082.91

4.4.0-1084.93

4.4.0-1085.94

4.4.0-1087.96

4.4.0-1088.97

4.4.0-1089.98

4.4.0-1090.99

4.4.0-1091.100

4.4.0-1092.101

4.4.0-1093.102

4.4.0-1094.103

4.4.0-1095.104

4.4.0-1096.105

4.4.0-1097.106

4.4.0-1098.107

4.4.0-1099.108

4.4.0-1100.109

4.4.0-1102.111

4.4.0-1103.112

4.4.0-1104.113

4.4.0-1105.114

4.4.0-1108.118

4.4.0-1110.120

4.4.0-1111.121

4.4.0-1112.122

4.4.0-1113.123

4.4.0-1114.124

4.4.0-1115.125

4.4.0-1116.126

4.4.0-1117.127

4.4.0-1118.128

4.4.0-1119.129

4.4.0-1120.130

4.4.0-1121.131

4.4.0-1122.132

4.4.0-1123.133

4.4.0-1124.134

4.4.0-1125.135

4.4.0-1126.136

4.4.0-1128.138

4.4.0-1129.139

4.4.0-1130.140

4.4.0-1131.141

4.4.0-1132.142

4.4.0-1134.144

4.4.0-1135.145

4.4.0-1136.146

4.4.0-1137.147

4.4.0-1138.148

4.4.0-1139.149

4.4.0-1140.151

4.4.0-1141.152

4.4.0-1142.153

4.4.0-1143.154

4.4.0-1144.155

4.4.0-1145.156

4.4.0-1146.157

4.4.0-1147.158

4.4.0-1148.159

4.4.0-1149.160

4.4.0-1150.161

4.4.0-1151.162

4.4.0-1152.163

4.4.0-1153.164

4.4.0-1154.165

4.4.0-1155.166

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-buildinfo-4.4.0-1156-kvm"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-cloud-tools-4.4.0-1156-kvm"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-headers-4.4.0-1156-kvm"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-image-4.4.0-1156-kvm"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-kvm-cloud-tools-4.4.0-1156"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-kvm-headers-4.4.0-1156"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-kvm-tools-4.4.0-1156"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-modules-4.4.0-1156-kvm"
        },
        {
            "binary_version": "4.4.0-1156.167",
            "binary_name": "linux-tools-4.4.0-1156-kvm"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8361-3.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-31504",
            "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"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}