{"id":24640,"date":"2026-09-16T20:32:35","date_gmt":"2026-09-16T12:32:35","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89953"},"modified":"2026-09-16T20:32:35","modified_gmt":"2026-09-16T12:32:35","slug":"cve-2026-89953","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89953","title":{"rendered":"CVE-2026-89953 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdoops: free pa"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mtd: mtdoops: free page bitmap when the backing MTD is removed<\/p>\n<p>mtdoops_notify_add() allocates oops_page_used when the configured MTD<br \/>\ndevice is registered.  mtdoops_notify_remove() detaches from that device<br \/>\nbut leaves the bitmap allocated.  If the same MTD device is later<br \/>\nregistered again, the add path allocates a new bitmap and overwrites the<br \/>\nold pointer, leaking one vmalloc allocation per remove\/add cycle.<\/p>\n<p>This is only visible when the backing MTD device can disappear and be<br \/>\nregistered again while mtdoops remains loaded, so the usual static MTD<br \/>\ncase does not expose it.<\/p>\n<p>Free the bitmap after unregistering the dumper and flushing the pending<br \/>\nworkers, then clear the pointer and page count before a later attach can<br \/>\nallocate fresh state.  Clearing the pointer also keeps the module exit<br \/>\npath from freeing the same bitmap a second time after a remove event.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mtd: mtdoops: free page bitmap when the backing MTD is removed<\/p>\n<p>mtdoops_notify_add() allocates oops_page_used when the configured M<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24640","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24640","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=24640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}