{"id":17262,"date":"2026-09-05T02:30:55","date_gmt":"2026-09-04T18:30:55","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80758"},"modified":"2026-09-05T02:30:55","modified_gmt":"2026-09-04T18:30:55","slug":"cve-2026-80758","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80758","title":{"rendered":"CVE-2026-80758 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Avoid private"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>futex: Avoid private hash use-after-free on final put<\/p>\n<p>futex_private_hash_put() drops the reference to fph before evaluating<br \/>\nfph-&gt;mm for wake_up_var(). futex_ref_put() enables preemption again before<br \/>\nreturning. If that put drops the final reference and the task is preempted,<br \/>\nanother task can pivot to the replacement hash and free the old hash after<br \/>\nan RCU grace period. The first task then reads fph-&gt;mm from the freed<br \/>\nallocation when it resumes.<\/p>\n<p>KASAN reports a slab-use-after-free in futex_private_hash_put(), with the<br \/>\nread at offset 24 in a freed kmalloc-512 allocation. The allocation and<br \/>\nfree stacks point to futex_hash_allocate() and the RCU free path,<br \/>\nrespectively.<\/p>\n<p>Load the mm pointer while the fph reference is still held and pass the<br \/>\nsaved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue<br \/>\nkey and does not dereference the mm through it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>futex: Avoid private hash use-after-free on final put<\/p>\n<p>futex_private_hash_put() drops the reference to fph before evaluating<br \/>\nfph-&gt;m<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17262","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17262","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=17262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}