{"schema":"threatline.record/2","record":{"id":"CVE-2026-98596","aliases":[],"summary":"ipv6: Fix dst leak for uncached routes.","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix dst leak for uncached routes.\n\nip6_route_output_flags(), ip6_rt_put_flags(), and ip6_dst_check()\ndetect an uncached route by list_empty(&rt->dst.rt_uncached),\nwhich replaced the static DST_NOCACHE flag check in commit\na4c2fd7f7891 (\"net: remove DST_NOCACHE flag\").\n\nWhen a device is unregistered, rt6_uncached_list_flush_dev()\nunlinks uncached routes tied to the device from rt6_uncached_list.\n\nPreviously, they were moved to another list with list_move()\n(__list_del_entry() + list_add()), and since commit 98aa546af5e4\n(\"inet: remove (struct uncached_list)->quarantine\"), the routes\nare just unlinked with list_del_init().\n\nIf list_del_init() runs concurrently, list_empty() evaluates to\ntrue; ip6_route_output_flags() calls dst_hold_safe() incorrectly\nand ip6_rt_put_flags() skips ip6_rt_put(), leaking dst, and thus\ndev tied via rt->from as well.\n\nThe same race is partially fixed by commit 9a6f0c4d5796 (\"dst:\nfix races in rt6_uncached_list_del() and rt_del_uncached_list()\").\n\nLet's check rt6->dst.rt_uncached_list instead.\n\nNote that IPv4 does not have the same issue.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98596","source_modified_at":"2026-10-19T09:22:21.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"98aa546af5e4f180439c82da403cc77926d3953b","lessThan":"5045aa25f3790dcdb158a58ac60ccf8da42959aa","status":"affected","versionType":"git"},{"version":"98aa546af5e4f180439c82da403cc77926d3953b","lessThan":"ed902d5546fb9c142b3216d8eec914fa1bc0aa80","status":"affected","versionType":"git"},{"version":"98aa546af5e4f180439c82da403cc77926d3953b","lessThan":"f9722746df13a8a29103c847ef56b02c11ce0963","status":"affected","versionType":"git"},{"version":"98aa546af5e4f180439c82da403cc77926d3953b","lessThan":"be31fe6333f534155e6b408f1ef6d77974bb41aa","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98596","source_modified_at":"2026-10-19T09:22:21.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.11","status":"affected"},{"version":"0","lessThan":"6.11","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-2026-98596","source_modified_at":"2026-10-19T09:22:21.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5045aa25f3790dcdb158a58ac60ccf8da42959aa","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09317,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:19:09.189Z","modified_at":"2026-10-19T09:22:21.750Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98596","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:22:21.750Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98596","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/5045aa25f3790dcdb158a58ac60ccf8da42959aa"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ed902d5546fb9c142b3216d8eec914fa1bc0aa80"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f9722746df13a8a29103c847ef56b02c11ce0963"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/be31fe6333f534155e6b408f1ef6d77974bb41aa"}],"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":"2026-10-19T09:22:21.750Z","content_hash":"f58ae5148896fc19e039bc22043764cbdd1a0e3c773d38948fa7356f239d2a2c"}}