netfilter: ctnetlink: ensure safe access to master conntrack

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/netfilter/nf_conntrack_core.h",
                        "net/netfilter/nf_conntrack_ecache.c",
                        "net/netfilter/nf_conntrack_expect.c",
                        "net/netfilter/nf_conntrack_netlink.c"
                    ],
                    "versions": [
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "9e1196d27ef496f404c76f7a9d03761142d991c4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "5e1c1d22268ae710c238342c8030c21daf298168",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "d52fa1fa7440676b8c238037a050ab008c22737f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "f338ced0473849c9f6ed0b77ca99f1aab5826787",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "497f99b26fffdc5635706d1b4811f1ed8ee21a5b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c1d10adb4a521de5760112853f42aaeefcec96eb",
                            "lessThan": "bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/netfilter/nf_conntrack_core.h",
                        "net/netfilter/nf_conntrack_ecache.c",
                        "net/netfilter/nf_conntrack_expect.c",
                        "net/netfilter/nf_conntrack_netlink.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.94",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.24",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.14",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }