{"id":41293,"date":"2026-10-19T00:33:03","date_gmt":"2026-10-18T16:33:03","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98821"},"modified":"2026-10-19T00:33:03","modified_gmt":"2026-10-18T16:33:03","slug":"cve-2026-98821","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98821","title":{"rendered":"CVE-2026-98821 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject polled"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>block: reject polled dio with user integrity metadata<\/p>\n<p>IOCB_HAS_METADATA leaves iocb-&gt;private as a uio_meta, while<br \/>\niocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I\/O<br \/>\nalways uses __blkdev_direct_IO(), which never publishes the bio for<br \/>\npolling, so IOPOLL calls bio_poll() on the uio_meta.<\/p>\n<p>Reproducer: io_uring IOPOLL plus a PI attribute on an integrity device<br \/>\n(scsi_debug dif=1 dix=1). KASAN reports:<\/p>\n<p>  Oops: general protection fault, probably for non-canonical<br \/>\n  address 0xdffffc0000000004<br \/>\n  KASAN: null-ptr-deref in range<br \/>\n  [0x0000000000000020-0x0000000000000027]<br \/>\n  RIP: 0010:bio_poll+0x9d\/0x4b0<br \/>\n  Call Trace:<br \/>\n   iocb_bio_iopoll+0x5b\/0x80<br \/>\n   io_uring_classic_poll+0xf3\/0x140<br \/>\n   io_do_iopoll+0x4e3\/0xc00<br \/>\n   io_iopoll_check+0x275\/0x560<br \/>\n   __do_sys_io_uring_enter+0x2e5\/0x720<\/p>\n<p>Return -EOPNOTSUPP when HIPRI is combined with user metadata.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>block: reject polled dio with user integrity metadata<\/p>\n<p>IOCB_HAS_METADATA leaves iocb-&gt;private as a uio_meta, while<br \/>\niocb_bio_iopoll(<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41293","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41293","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=41293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}