UBUNTU-CVE-2026-52909

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    UBUNTU-CVE-2026-52909

    Published: 19 Jun 2026Last Modified: 25 Sept 2026
    Upstream:
    CVE-2026-52909
    Aliases:
    USN-8726-1
    USN-8726-2
    USN-8726-3

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.

    References: https://ubuntu.com/security/CVE-2026-52909, https://www.cve.org/CVERecord?id=CVE-2026-52909, https://git.kernel.org/linus/d289d5307762d1838aaece22c6b6fcad9e8865f9, https://ubuntu.com/security/notices/USN-8726-1, https://ubuntu.com/security/notices/USN-8727-1, https://ubuntu.com/security/notices/USN-8728-1, https://ubuntu.com/security/notices/USN-8760-1, https://ubuntu.com/security/notices/USN-8781-1, https://ubuntu.com/security/notices/USN-8726-2, https://ubuntu.com/security/notices/USN-8726-3, https://ubuntu.com/security/notices/USN-8800-1, https://ubuntu.com/security/notices/USN-8760-2, https://ubuntu.com/security/notices/USN-8728-2, https://ubuntu.com/security/notices/USN-8726-4

    Affected packages

    Package

    Name: linux-aws

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.4.0-1002.2
    4.4.0-1003.3
    4.4.0-1005.5
    4.4.0-1006.6
    4.4.0-1009.9
    4.4.0-1010.10
    4.4.0-1011.11
    4.4.0-1012.12
    4.4.0-1014.14
    4.4.0-1016.16
    4.4.0-1017.17
    4.4.0-1019.19
    4.4.0-1022.22
    4.4.0-1023.23
    4.4.0-1024.25
    4.4.0-1025.26
    4.4.0-1027.30
    4.4.0-1028.31
    4.4.0-1029.32
    4.4.0-1031.34
    4.4.0-1032.35
    4.4.0-1034.37
    4.4.0-1036.39
    4.4.0-1037.40
    4.4.0-1038.41
    4.4.0-1039.42
    4.4.0-1040.43
    4.4.0-1042.45
    4.4.0-1044.47
    4.4.0-1045.48
    4.4.0-1046.50
    4.4.0-1048.52
    4.4.0-1050.54
    4.4.0-1052.56
    4.4.0-1054.58
    4.4.0-1055.59
    4.4.0-1056.60
    4.4.0-1058.62
    4.4.0-1059.63
    4.4.0-1060.64
    4.4.0-1061.65
    4.4.0-1062.66
    4.4.0-1064.68
    4.4.0-1065.69
    4.4.0-1066.70
    4.4.0-1067.71
    4.4.0-1073.77
    4.4.0-1074.78
    4.4.0-1075.79
    4.4.0-1076.80
    4.4.0-1077.81
    4.4.0-1078.82
    4.4.0-1081.85
    4.4.0-1082.86
    4.4.0-1083.87
    4.4.0-1085.89
    4.4.0-1086.90
    4.4.0-1087.91
    4.4.0-1088.92
    4.4.0-1090.94
    4.4.0-1091.95
    4.4.0-1092.96
    4.4.0-1093.97
    4.4.0-1094.99
    4.4.0-1095.100
    4.4.0-1096.101
    4.4.0-1097.102
    4.4.0-1098.103
    4.4.0-1099.104
    4.4.0-1101.106
    4.4.0-1102.107
    4.4.0-1103.108
    4.4.0-1104.109
    4.4.0-1107.113
    4.4.0-1109.115
    4.4.0-1110.116
    4.4.0-1111.117
    4.4.0-1112.118
    4.4.0-1113.119
    4.4.0-1114.120
    4.4.0-1115.121
    4.4.0-1116.122
    4.4.0-1117.123
    4.4.0-1118.124
    4.4.0-1119.125
    4.4.0-1120.126
    4.4.0-1121.127
    4.4.0-1122.128
    4.4.0-1123.129
    4.4.0-1124.130
    4.4.0-1125.131
    4.4.0-1127.133
    4.4.0-1128.134
    4.4.0-1129.135
    4.4.0-1130.136
    4.4.0-1131.137
    4.4.0-1133.139
    4.4.0-1134.140
    4.4.0-1135.141
    4.4.0-1136.142
    4.4.0-1137.143
    4.4.0-1138.144
    4.4.0-1139.145
    4.4.0-1140.146
    4.4.0-1141.147
    4.4.0-1142.148
    4.4.0-1143.149
    4.4.0-1144.150
    4.4.0-1145.151
    4.4.0-1146.152
    4.4.0-1147.153
    4.4.0-1148.154
    4.4.0-1149.155
    4.4.0-1150.156
    4.4.0-1151.157
    4.4.0-1152.158
    4.4.0-1153.159
    4.4.0-1154.160
    4.4.0-1155.161
    4.4.0-1156.162
    4.4.0-1157.163
    4.4.0-1158.164

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-52909 | CVE-DB