{"id":40965,"date":"2026-10-19T00:31:41","date_gmt":"2026-10-18T16:31:41","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98493"},"modified":"2026-10-19T00:31:41","modified_gmt":"2026-10-18T16:31:41","slug":"cve-2026-98493","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98493","title":{"rendered":"CVE-2026-98493 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipconfig: bound"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net: ipconfig: bound DHCP option construction<\/p>\n<p>ic_dhcp_init_options() appends the hostname (option 12), vendor-class<br \/>\n(option 60) and client-ID (option 61) options into the fixed 312-byte<br \/>\nbootp_pkt.exten[] buffer.  Only the client-ID branch checked the<br \/>\nremaining space; the hostname and vendor-class writes were unbounded.<\/p>\n<p>A 64-byte hostname together with the maximum 252-byte dhcpclass=<br \/>\nidentifier needs 18 + (2 + 64) + (2 + 252) = 338 of the 312 available<br \/>\nbytes even before the terminating END marker, so the vendor-class memcpy<br \/>\nruns past the end of exten[].  With CONFIG_FORTIFY_SOURCE this is<br \/>\nreported as a field-spanning write and, when the kernel is booted with<br \/>\npanic_on_warn=1, aborts boot with a panic.<\/p>\n<p>Route the optional options through a common helper that makes sure the<br \/>\noption, its 2-byte header and the END marker all fit and drops an option<br \/>\nthat would not.  Configurations with short options keep sending exactly<br \/>\nthe same bytes as before.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net: ipconfig: bound DHCP option construction<\/p>\n<p>ic_dhcp_init_options() appends the hostname (option 12), vendor-class<br \/>\n(option 60) an<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-40965","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/40965","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=40965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}