{"id":"CVE-2026-74480","revision":"4534c20992a345b992d4dfcc4f9cead5","records":[{"revision":"4534c20992a345b992d4dfcc4f9cead5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74480","aliases":[],"title":"net: bridge: stop fast-leave after deleting a port group","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: stop fast-leave after deleting a port group\n\nbr_multicast_leave_group() iterates mp->ports with pp = &p->next in\nits fast-leave path. After br_multicast_del_pg() removes p,\ncontinuing the loop advances pp through the deleted entry.\n\nIf multicast-to-unicast was enabled, the bridge can hold multiple port\ngroups for the same port and group with different source MAC\naddresses. Once multicast-to-unicast is disabled,\nbr_port_group_equal() matches those entries by port only. A fast leave\ncan then delete one entry and continue from its stale next pointer,\nleaving mp->ports pointing at a deleted port group.\n\nFast leave only needs to remove one matching port group. Break after\nbr_multicast_del_pg() so the loop stops before dereferencing the\nremoved entry.","state":0,"publishedAt":"2026-08-15T12:27:13.803+00:00","modifiedAt":"2026-10-16T19:05:48.808+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bridge/br_multicast.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"d6c32e2e25a9a06ba021030e26b6d602a277eb72\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"482bcb85139addb4e8ac8ed10baeda3e0aad4031\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"1a109cc9890d017c41d77e6c82da739579c49f0b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"159ad90cb929c033308bb39a2c5f8fbf393b77aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"4695430e8132420bf8de94da3eb36a6cf35fde6b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"0309ebbc570000ea0df11c06b69798e5860c5f6f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6db6f0eae6052b70885562e1733896647ec1d807\",\n                            \"lessThan\": \"a39789f211b8a4125f0c70e05b30cf715f4f187d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bridge/br_multicast.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.151\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.103\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/d6c32e2e25a9a06ba021030e26b6d602a277eb72","https://git.kernel.org/stable/c/482bcb85139addb4e8ac8ed10baeda3e0aad4031","https://git.kernel.org/stable/c/1a109cc9890d017c41d77e6c82da739579c49f0b","https://git.kernel.org/stable/c/159ad90cb929c033308bb39a2c5f8fbf393b77aa","https://git.kernel.org/stable/c/4695430e8132420bf8de94da3eb36a6cf35fde6b","https://git.kernel.org/stable/c/0309ebbc570000ea0df11c06b69798e5860c5f6f","https://git.kernel.org/stable/c/4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4","https://git.kernel.org/stable/c/a39789f211b8a4125f0c70e05b30cf715f4f187d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74480","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74480","identifiers":["CVE-2026-74480"]},"retained":false,"historicalAffected":[]}],"coverage":[]}