{"id":24665,"date":"2026-09-16T20:32:37","date_gmt":"2026-09-16T12:32:37","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89978"},"modified":"2026-09-16T20:32:37","modified_gmt":"2026-09-16T12:32:37","slug":"cve-2026-89978","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89978","title":{"rendered":"CVE-2026-89978 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\naccel\/amdxdna: return"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>accel\/amdxdna: return early from a zero-length flush<\/p>\n<p>SYNC_BO does not constrain its size, so a request for zero bytes reaches<br \/>\ndrm_clflush_virt_range(), which ends with an unconditional<br \/>\nclflushopt(end &#8211; 1). For an empty range that is the byte before the<br \/>\nmapping, and abo-&gt;mem.kva comes from vmap(), so the access lands in the<br \/>\nguard page below the vmalloc area and faults:<\/p>\n<p>  BUG: unable to handle page fault for address: ffffd16fbbc70fff<br \/>\n  #PF: supervisor read access in kernel mode<br \/>\n  Oops: Oops: 0000 [#1] SMP NOPTI<br \/>\n  CPU: 7 UID: 1000 Comm: sync_bo_probe<br \/>\n  RIP: 0010:drm_clflush_virt_range+0x3c\/0x70<br \/>\n  Call Trace:<br \/>\n   amdxdna_drm_sync_bo_ioctl+0x124\/0x430 [amdxdna]<br \/>\n   drm_ioctl+0x301\/0x4c0<br \/>\n   __x64_sys_ioctl+0x115\/0x2f0<br \/>\n   do_syscall_64+0xa6\/0x3d0<\/p>\n<p>Any process that can open the render node can do this. Reproduced 3 of 3<br \/>\ntimes on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on<br \/>\nan AMDXDNA_BO_SHARE object. The import arm takes the same request but<br \/>\nflushes the whole scatterlist, so it survives it.<\/p>\n<p>Nothing needs flushing for an empty range, so answer before choosing a<br \/>\npath.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>accel\/amdxdna: return early from a zero-length flush<\/p>\n<p>SYNC_BO does not constrain its size, so a request for zero bytes reaches<br \/>\ndrm_<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24665","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24665","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=24665"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24665"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}