{"id":"CVE-2025-21759","revision":"cb78d6b72ff44fb29c340c541cda4fe8","records":[{"revision":"cb78d6b72ff44fb29c340c541cda4fe8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21759","aliases":[],"title":"ipv6: mcast: extend RCU protection in igmp6_send()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net->ipv6.igmp_sk\nsocket under RCU protection.","state":0,"publishedAt":"2025-02-27T02:18:12.994+00:00","modifiedAt":"2026-10-03T10:55:25.159+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/ipv6/mcast.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"638e8fe3563a82f298fe537a28d5342a97278cf1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"6901bbb169e3add6c037218d996790cef6b3d650\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"0bf8e2f3768629d437a32cb824149e6e98254381\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"8e92d6a413feaf968a33f0b439ecf27404407458\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551\",\n                            \"lessThan\": \"087c1faa594fa07a66933d750c0b2610aa1a2946\",\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/ipv6/mcast.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.26\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.26\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.79\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.16\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.13.4\",\n                            \"lessThanOrEqual\": \"6.13.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.14\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/638e8fe3563a82f298fe537a28d5342a97278cf1","https://git.kernel.org/stable/c/6901bbb169e3add6c037218d996790cef6b3d650","https://git.kernel.org/stable/c/7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff","https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a","https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381","https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458","https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21759","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21759","identifiers":["CVE-2025-21759"]},"retained":false,"historicalAffected":[]}],"coverage":[]}