{"id":"CVE-2026-98102","revision":"2858ef85265646f396bc83d1c542d35a","records":[{"revision":"2858ef85265646f396bc83d1c542d35a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98102","aliases":[],"title":"ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu().","state":0,"publishedAt":"2026-09-25T10:35:53.332+00:00","modifiedAt":"2026-10-19T09:13:54.775+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\": \"4b200e398953c237c86d32bf26d4cb2a96556a6f\",\n                            \"lessThan\": \"c3343cd7ec8706c221e52b782f386b9af14a928a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b200e398953c237c86d32bf26d4cb2a96556a6f\",\n                            \"lessThan\": \"4352737297b262e8367675c19a7dc6a9f53c97af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b200e398953c237c86d32bf26d4cb2a96556a6f\",\n                            \"lessThan\": \"8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b200e398953c237c86d32bf26d4cb2a96556a6f\",\n                            \"lessThan\": \"5149c60c406595b56fda0c6e9aae7fd287f636aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b200e398953c237c86d32bf26d4cb2a96556a6f\",\n                            \"lessThan\": \"93b49239840b91313adbd77b8b52993eff2d08c1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"86c49119f0353f857cc08030ec9e4ebaab3d5a64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThan\": \"5.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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\": \"5.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a","https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af","https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4","https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa","https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98102","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98102","identifiers":["CVE-2026-98102"]},"retained":false,"historicalAffected":[]}],"coverage":[]}