{"id":29030,"date":"2026-09-25T20:31:43","date_gmt":"2026-09-25T12:31:43","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97598"},"modified":"2026-09-25T20:31:43","modified_gmt":"2026-09-25T12:31:43","slug":"cve-2026-97598","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97598","title":{"rendered":"CVE-2026-97598 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: bound auto"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv4: fib: bound automatic table ID allocation<\/p>\n<p>fib_empty_table() probes every table ID from 1 until it finds a<br \/>\nfree one.  IPv4 tables are stored in a 256-bucket hash table, so a<br \/>\ndense set of IDs makes each probe walk a growing hash chain while<br \/>\nRTNL is held.<\/p>\n<p>Automatic table assignment (&#8220;ip rule &#8230; table 0&#8221;) is an IPv4-only<br \/>\nlegacy path.  Bound the automatically allocated ID to 4096 so the<br \/>\nRTNL hold stays bounded, without changing lookups of explicitly<br \/>\nspecified table IDs.<\/p>\n<p>This changes user-visible behavior.  A table-0 rule previously<br \/>\nreceived the lowest free ID in 1..RT_TABLE_MAX (0xFFFFFFFF).  After<br \/>\nthis patch the search stops at 4096 and the rule add fails with<br \/>\nENOBUFS if that range is fully occupied.  Explicit table IDs above<br \/>\n4096 remain usable.<\/p>\n<p>The automatic path is unused in practice: it is IPv4-only, not<br \/>\ndocumented by ip-rule, uncovered by kernel selftests, and both<br \/>\nNetworkManager and systemd refuse table 0.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv4: fib: bound automatic table ID allocation<\/p>\n<p>fib_empty_table() probes every table ID from 1 until it finds a<br \/>\nfree one.  IPv4 tab<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29030","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}