{"id":21367,"date":"2026-09-12T04:31:05","date_gmt":"2026-09-11T20:31:05","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89445"},"modified":"2026-09-12T04:31:05","modified_gmt":"2026-09-11T20:31:05","slug":"cve-2026-89445","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89445","title":{"rendered":"CVE-2026-89445 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix UAF in s"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>iommufd: Fix UAF in selftest IOPF reporting<\/p>\n<p>IOMMUFD selftest TRIGGER_IOPF borrows an attach handle from<br \/>\ngroup-&gt;pasid_array without synchronizing against PASID detach,<br \/>\nthen a concurrent iommu_report_device_fault() can dereference<br \/>\nthat borrowed handle&#8217;s domain pointer after the detach erases<br \/>\nthe handle and frees the backing struct iommufd_attach_handle.<br \/>\nTRIGGER_IOPF then dereferences the freed handle, causing a UAF.<\/p>\n<p>Fix by adding a iopf_rwsem in mock_dev to follow the expected design<br \/>\nof a real driver. Hold its read side across the whole<br \/>\niommu_report_device_fault() call, and its write side around every<br \/>\npath that attaches, detaches, or replaces a device domain.<br \/>\nThis can block new reports and drains in-flight reports before an old<br \/>\nattach handle or the IOPF fault parameter can be removed.<br \/>\nAlso take the write side while registering a mock device, since<br \/>\nit can invoke the mock driver&#8217;s default-domain attach callback.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>iommufd: Fix UAF in selftest IOPF reporting<\/p>\n<p>IOMMUFD selftest TRIGGER_IOPF borrows an attach handle from<br \/>\ngroup-&gt;pasid_array without<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21367","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21367","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=21367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21367"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}