{"schema":"threatline.record/2","record":{"id":"CVE-2026-98487","aliases":[],"summary":"net: bridge: mdb: restart port group walk after deletion","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mdb: restart port group walk after deletion\n\nbr_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking\nmp->ports. br_multicast_del_pg() can re-enter the same MDB entry through\nbr_multicast_sg_del_exclude_ports() and unlink other port groups. If the\ncursor points into one of those groups, the next iteration dereferences a\nstale cursor and can leave mp->ports pointing at freed memory.\n\nA following RTM_GETMDB exposes the dangling pointer:\n\n  BUG: KASAN: slab-use-after-free in br_mdb_dump\n  Read of size 8\n    br_mdb_dump\n    rtnl_mdb_dump\n    rtnl_dumpit\n    netlink_dump\n\nReset the cursor to mp->ports after every deletion. The deletion removes at\nleast the selected group, so the restarted walk always makes progress.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98487","source_modified_at":"2026-10-24T14:09:03.998Z","fetched_at":"2026-10-24T14:26:37.433577Z","product":"Linux","vendor":"Linux","versions":[{"version":"a6acb535afb2a3b688a7858f05b61f0433e480d5","lessThan":"46ec55855c972504258c371677ac039ba20e5d12","status":"affected","versionType":"git"},{"version":"a6acb535afb2a3b688a7858f05b61f0433e480d5","lessThan":"ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe","status":"affected","versionType":"git"},{"version":"a6acb535afb2a3b688a7858f05b61f0433e480d5","lessThan":"fe2a42789c12eb7c5d3a42191e2cc735a6c35ead","status":"affected","versionType":"git"},{"version":"a6acb535afb2a3b688a7858f05b61f0433e480d5","lessThan":"ab1404ac81154a89fb61ac50ae9a04cd8d4834dc","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98487","source_modified_at":"2026-10-24T14:09:03.998Z","fetched_at":"2026-10-24T14:26:37.433577Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.8","status":"affected"},{"version":"0","lessThan":"6.8","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98487","source_modified_at":"2026-10-24T14:09:03.998Z","fetched_at":"2026-10-24T14:26:37.433577Z","package":{"name":"Linux","ecosystem":null},"version":"46ec55855c972504258c371677ac039ba20e5d12","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09336,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:16:04.746Z","modified_at":"2026-10-24T14:09:03.998Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98487","fetched_at":"2026-10-24T14:26:37.433577Z","source_modified_at":"2026-10-24T14:09:03.998Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98487","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/46ec55855c972504258c371677ac039ba20e5d12"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fe2a42789c12eb7c5d3a42191e2cc735a6c35ead"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ab1404ac81154a89fb61ac50ae9a04cd8d4834dc"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-24T14:09:03.998Z","content_hash":"c52dfe11af094a4660c6800a55fbcb52512ad8708d5fb07b2ae9690b7ce999d5"}}