In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tcp: clamp route advmss to TCP_MIN_MSS<\/p>\n
tcp_select_initial_window() assumes that callers never pass an MSS
\nsmaller than 1, but route-derived advmss values can violate that
\nassumption.<\/p>\n
A too-small explicit RTAX_ADVMSS is one way to get there, but it is not
\nthe only one. The same divide-by-zero can also be reached through the
\n“default advmss” path when RTAX_ADVMSS is left at 0 and the effective
\nadvmss is later driven down by route MTU and min_adv_mss.<\/p>\n
Introduce a tcp_dst_advmss() helper that clamps route advmss to
\nTCP_MIN_MSS before TCP consumes it, and use it in the TCP paths that
\nderive advmss from dst metrics. This keeps the effective MSS from
\ndropping to zero before tcp_select_initial_window() rounds the receive
\nwindow.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tcp: clamp route advmss to TCP_MIN_MSS<\/p>\n
tcp_select_initial_window() assumes that callers never pass an MSS
\nsmaller than 1, but rout<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17351","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17351","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=17351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}