{"id":21564,"date":"2026-09-12T04:31:21","date_gmt":"2026-09-11T20:31:21","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89642"},"modified":"2026-09-12T04:31:21","modified_gmt":"2026-09-11T20:31:21","slug":"cve-2026-89642","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89642","title":{"rendered":"CVE-2026-89642 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: call pagecache_"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>cifs: call pagecache_isize_extended() in cifs_setsize() when extending<\/p>\n<p>cifs_setsize() calls truncate_pagecache() but skips<br \/>\npagecache_isize_extended() on extension.  truncate_setsize() shows<br \/>\nthe correct pattern:<\/p>\n<p>  i_size_write(inode, newsize);<br \/>\n  if (newsize &gt; oldsize)<br \/>\n      pagecache_isize_extended(inode, oldsize, newsize);<br \/>\n  truncate_pagecache(inode, newsize);<\/p>\n<p>pagecache_isize_extended() zeroes the tail of the page straddling old<br \/>\nEOF.  Without it, dirty bytes in that region can be written back to<br \/>\nthe server, exposing stale data in the newly extended range.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>cifs: call pagecache_isize_extended() in cifs_setsize() when extending<\/p>\n<p>cifs_setsize() calls truncate_pagecache() but skips<br \/>\npagecac<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21564","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21564","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=21564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}