{"schema":"threatline.record/2","record":{"id":"CVE-2026-98099","aliases":[],"summary":"ipv6: mcast: use rcu_assign_pointer() for __rcu list updates","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: use rcu_assign_pointer() for __rcu list updates\n\nSeveral places in net/ipv6/mcast.c update RCU-protected lists\n(np->ipv6_mc_list, idev->mc_list, idev->mc_tomb) using direct pointer\nassignments instead of rcu_assign_pointer():\n\n1. In __ipv6_dev_mc_dec(), unlinking a group from idev->mc_list did:\n       *map = ma->next;\n   without rcu_assign_pointer() while concurrent readers traverse\n   idev->mc_list locklessly under rcu_read_lock().\n2. In ipv6_sock_mc_drop() and __ipv6_sock_mc_close(), unlinking a group\n   from np->ipv6_mc_list directly assigned *lnk = mc_lst->next and\n   np->ipv6_mc_list = mc_lst->next without rcu_assign_pointer(), racing\n   with lockless readers in inet6_mc_check().\n3. In __ipv6_sock_mc_join(), mc_lst->next was initialized to\n   np->ipv6_mc_list via raw assignment before publishing mc_lst.\n4. In mld_del_delrec() and __ipv6_dev_mc_inc(), __rcu source pointers\n   passed into rcu_assign_pointer() lacked explicit dereference helpers.\n\nFix these by consistently using rcu_assign_pointer() along with\nmc_dereference() / sock_dereference().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"456b61bca8ee324ab6c18b065e632c9a8c88aa39","lessThan":"0e3e3cec28c4d1bf29948da40b4e9e5d44f7852b","status":"affected","versionType":"git"},{"version":"456b61bca8ee324ab6c18b065e632c9a8c88aa39","lessThan":"49d7e1b456ba2f3ee08b3e264d999c09992cde8e","status":"affected","versionType":"git"},{"version":"456b61bca8ee324ab6c18b065e632c9a8c88aa39","lessThan":"afca229b39acc2590976b3e4f6e0fe76cededc60","status":"affected","versionType":"git"},{"version":"456b61bca8ee324ab6c18b065e632c9a8c88aa39","lessThan":"2e46b0c9fcf7e10b64ce1630b925f47918d1f7f6","status":"affected","versionType":"git"},{"version":"456b61bca8ee324ab6c18b065e632c9a8c88aa39","lessThan":"0c8f56c583c3250408367880c98e4d6fbc929315","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","lessThan":"2.6.38","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.114","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","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-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0e3e3cec28c4d1bf29948da40b4e9e5d44f7852b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"49d7e1b456ba2f3ee08b3e264d999c09992cde8e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2e46b0c9fcf7e10b64ce1630b925f47918d1f7f6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","source_modified_at":"2026-10-21T12:54:29.854Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0c8f56c583c3250408367880c98e4d6fbc929315","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00183,"percentile":0.07505,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:24:28.929Z","modified_at":"2026-10-21T12:54:29.854Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98099","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:54:29.854Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98099","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/0e3e3cec28c4d1bf29948da40b4e9e5d44f7852b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/49d7e1b456ba2f3ee08b3e264d999c09992cde8e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/afca229b39acc2590976b3e4f6e0fe76cededc60"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2e46b0c9fcf7e10b64ce1630b925f47918d1f7f6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0c8f56c583c3250408367880c98e4d6fbc929315"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:54:29.854Z","content_hash":"b0ea2adc99e6756a62fd505dd481a2fafed332342cbe234ef304329ccd0b912c"}}