USN-8530-2

It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43284)

It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43503)

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:

InfiniBand drivers;
SCSI subsystem;
Thermal drivers;
USB over IP driver;
Network file system (NFS) server daemon;
SMB network file system;
Tracing infrastructure;
B.A.T.M.A.N. meshing protocol;
Ethernet bridge;
Ceph Core library;
DCCP (Datagram Congestion Control Protocol);
IPv4 networking;
IPv6 networking;
Netfilter;
RxRPC session sockets;
X.25 network layer; (CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037, CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)

References

Affected packages

Ubuntu:Pro:16.04:LTS / linux-aws-hwe

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

4.15.0-1194.207~16.04.1

Affected versions

4.*

4.15.0-1030.31~16.04.1

4.15.0-1031.33~16.04.1

4.15.0-1032.34~16.04.1

4.15.0-1033.35~16.04.1

4.15.0-1035.37~16.04.1

4.15.0-1036.38~16.04.1

4.15.0-1039.41~16.04.1

4.15.0-1040.42~16.04.1

4.15.0-1041.43~16.04.1

4.15.0-1043.45~16.04.1

4.15.0-1044.46~16.04.1

4.15.0-1045.47~16.04.1

4.15.0-1047.49~16.04.1

4.15.0-1048.50~16.04.1

4.15.0-1050.52~16.04.1

4.15.0-1051.53~16.04.1

4.15.0-1052.54~16.04.1

4.15.0-1054.56~16.04.1

4.15.0-1056.58~16.04.1

4.15.0-1057.59~16.04.1

4.15.0-1058.60~16.04.1

4.15.0-1060.62~16.04.1

4.15.0-1063.67~16.04.1

4.15.0-1065.69~16.04.1

4.15.0-1066.70~16.04.1

4.15.0-1067.71~16.04.1

4.15.0-1073.77~16.04.1

4.15.0-1074.78~16.04.1

4.15.0-1079.83~16.04.1

4.15.0-1080.84~16.04.1

4.15.0-1082.86~16.04.1

4.15.0-1083.87~16.04.1

4.15.0-1085.90~16.04.1

4.15.0-1088.93~16.04.1

4.15.0-1090.95~16.04.1

4.15.0-1091.96~16.04.1

4.15.0-1093.99~16.04.1

4.15.0-1094.101~16.04.1

4.15.0-1095.102~16.04.1

4.15.0-1096.103~16.04.1

4.15.0-1097.104~16.04.1

4.15.0-1098.105~16.04.1

4.15.0-1099.106~16.04.1

4.15.0-1102.109~16.04.1

4.15.0-1103.110~16.04.1

4.15.0-1106.113~16.04.1

4.15.0-1109.116~16.04.1

4.15.0-1110.117~16.04.1

4.15.0-1111.118~16.04.1

4.15.0-1112.119~16.04.1

4.15.0-1113.120~16.04.1

4.15.0-1115.122~16.04.1

4.15.0-1116.123~16.04.1

4.15.0-1118.125~16.04.1

4.15.0-1119.126~16.04.2

4.15.0-1120.128~16.04.1

4.15.0-1123.132~16.04.1

4.15.0-1124.133~16.04.1

4.15.0-1126.135~16.04.2

4.15.0-1127.136~16.04.1

4.15.0-1128.137~16.04.1

4.15.0-1130.139~16.04.1

4.15.0-1133.143~16.04.1

4.15.0-1136.147~16.04.1

4.15.0-1137.148~16.04.1

4.15.0-1139.150~16.04.1

4.15.0-1140.151~16.04.1

4.15.0-1141.152~16.04.1

4.15.0-1142.154~16.04.1

4.15.0-1143.155~16.04.1

4.15.0-1146.158~16.04.2

4.15.0-1147.159~16.04.1

4.15.0-1148.160~16.04.1

4.15.0-1151.164~16.04.1

4.15.0-1153.166~16.04.1

4.15.0-1154.167~16.04.1

4.15.0-1155.168~16.04.1

4.15.0-1156.169~16.04.1

4.15.0-1157.170~16.04.1

4.15.0-1158.171~16.04.1

4.15.0-1159.172~16.04.1

4.15.0-1160.173~16.04.1

4.15.0-1161.174~16.04.1

4.15.0-1162.175~16.04.1

4.15.0-1163.176~16.04.1

4.15.0-1164.177~16.04.1

4.15.0-1165.178~16.04.1

4.15.0-1166.179~16.04.1

4.15.0-1167.180~16.04.1

4.15.0-1168.181~16.04.1

4.15.0-1169.182~16.04.1

4.15.0-1170.183~16.04.1

4.15.0-1172.185~16.04.1

4.15.0-1173.186~16.04.1

4.15.0-1174.187~16.04.1

4.15.0-1175.188~16.04.1

4.15.0-1176.189~16.04.1

4.15.0-1177.190~16.04.1

4.15.0-1178.191~16.04.1

4.15.0-1179.192~16.04.1

4.15.0-1180.193~16.04.1

4.15.0-1181.194~16.04.1

4.15.0-1182.195~16.04.1

4.15.0-1183.196~16.04.1

4.15.0-1184.197~16.04.1

4.15.0-1185.198~16.04.1

4.15.0-1186.199~16.04.1

4.15.0-1187.200~16.04.1

4.15.0-1188.201~16.04.1

4.15.0-1189.202~16.04.1

4.15.0-1190.203~16.04.1

4.15.0-1191.204~16.04.1

4.15.0-1192.205~16.04.1

Ecosystem specific

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "linux-aws-headers-4.15.0-1194",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-aws-hwe-cloud-tools-4.15.0-1194",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-aws-hwe-tools-4.15.0-1194",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-buildinfo-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-cloud-tools-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-headers-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-image-unsigned-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-modules-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-modules-extra-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        },
        {
            "binary_name":  "linux-tools-4.15.0-1194-aws",
            "binary_version":  "4.15.0-1194.207~16.04.1"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2021-47202",
            "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":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2024-56643",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-23272",
            "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-2026-23455",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31402",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31607",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31637",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31659",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31682",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-31685",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43011",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43037",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43038",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43383",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43407",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43414",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-43503",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-45988",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-46043",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "critical",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-46119",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "high",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-46243",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:16.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8530-2.json"