{"api_version":"1","generated_at":"2026-09-26T03:03:18+00:00","cve":"CVE-2026-98102","urls":{"html":"https://cve.report/CVE-2026-98102","api":"https://cve.report/api/cve/CVE-2026-98102.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98102","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98102"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:39","updated_at":"2026-09-25 11:17:39"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af","name":"https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4","name":"https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1","name":"https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa","name":"https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98102","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98102","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 4352737297b262e8367675c19a7dc6a9f53c97af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 5149c60c406595b56fda0c6e9aae7fd287f636aa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 93b49239840b91313adbd77b8b52993eff2d08c1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 86c49119f0353f857cc08030ec9e4ebaab3d5a64 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.261 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/mcast.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4352737297b262e8367675c19a7dc6a9f53c97af","status":"affected","version":"4b200e398953c237c86d32bf26d4cb2a96556a6f","versionType":"git"},{"lessThan":"8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4","status":"affected","version":"4b200e398953c237c86d32bf26d4cb2a96556a6f","versionType":"git"},{"lessThan":"5149c60c406595b56fda0c6e9aae7fd287f636aa","status":"affected","version":"4b200e398953c237c86d32bf26d4cb2a96556a6f","versionType":"git"},{"lessThan":"93b49239840b91313adbd77b8b52993eff2d08c1","status":"affected","version":"4b200e398953c237c86d32bf26d4cb2a96556a6f","versionType":"git"},{"status":"affected","version":"86c49119f0353f857cc08030ec9e4ebaab3d5a64","versionType":"git"},{"lessThan":"5.11","status":"affected","version":"5.10.261","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/mcast.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.13"},{"lessThan":"5.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"5.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"5.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"5.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc2","versionStartIncluding":"5.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.261","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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()."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:35:53.332Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"},{"url":"https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"},{"url":"https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"},{"url":"https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"}],"title":"ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98102","datePublished":"2026-09-25T10:35:53.332Z","dateReserved":"2026-09-25T10:25:14.315Z","dateUpdated":"2026-09-25T10:35:53.332Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:39","lastModifiedDate":"2026-09-25 11:17:39","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98102","Ordinal":"1","Title":"ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()","CVE":"CVE-2026-98102","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98102","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()"}]}}}