{"id":29095,"date":"2026-09-25T20:31:52","date_gmt":"2026-09-25T12:31:52","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97939"},"modified":"2026-09-25T20:31:52","modified_gmt":"2026-09-25T12:31:52","slug":"cve-2026-97939","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97939","title":{"rendered":"CVE-2026-97939 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: account multica"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipmr: account multicast table and route memory<\/p>\n<p>A netadmin in a user+net namespace can create many IPv4 and IPv6<br \/>\nmulticast routing tables with MRT_TABLE and MRT6_TABLE. Each unseen<br \/>\nid allocates an mr_table via the shared mr_table_alloc(), links it<br \/>\ninto the per-net list, and leaves it until netns teardown. Those<br \/>\nobjects were not charged to memcg, so the host unreclaimable slab<br \/>\ngrows with the table count.<\/p>\n<p>Account mr_table allocations with GFP_KERNEL_ACCOUNT and mark the<br \/>\nIPv4\/IPv6 MFC caches SLAB_ACCOUNT. This matches the established<br \/>\nhandling of IP addresses, routes and alternate interface names.<\/p>\n<p>Unresolved MFC entries are still allocated from softIRQ with<br \/>\nGFP_ATOMIC and are not charged. They expire after 10 seconds and are<br \/>\nbounded by the socket receive queue; see commit 0079ad8e8dc3<br \/>\n(&#8220;ipmr: remove hard code cache_resolve_queue_len limit&#8221;).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipmr: account multicast table and route memory<\/p>\n<p>A netadmin in a user+net namespace can create many IPv4 and IPv6<br \/>\nmulticast routing <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29095","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29095","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=29095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}