{"id":21411,"date":"2026-09-12T04:31:09","date_gmt":"2026-09-11T20:31:09","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89489"},"modified":"2026-09-12T04:31:09","modified_gmt":"2026-09-11T20:31:09","slug":"cve-2026-89489","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89489","title":{"rendered":"CVE-2026-89489 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nopenrisc: fix arbitra"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>openrisc: fix arbitrary kernel memory access via or1k_atomic syscall<\/p>\n<p>sys_or1k_atomic() (syscall 244 in the &#8220;or1k&#8221; ABI) takes two user<br \/>\npointers, v1 and v2, and swaps the words they point to in hand-written<br \/>\nassembly.<\/p>\n<p>    l.lwz   r29,0(r4)<br \/>\n    l.lwz   r27,0(r5)<br \/>\n    l.sw    0(r4),r27<br \/>\n    l.sw    0(r5),r29<\/p>\n<p>The pointers are not checked with access_ok(). The four memory<br \/>\naccesses also have no exception table entries.<\/p>\n<p>A caller passes a kernel address as either pointer, and the syscall<br \/>\nreads from and writes to it directly.<\/p>\n<p>This gives an unprivileged process a kernel read\/write primitive. It<br \/>\noverwrites kernel data such as the sys_call_table, gaining code<br \/>\nexecution in kernel context.<\/p>\n<p>Check both pointers before entering the critical section. Add fixups<br \/>\nfor the four memory accesses so faults on valid but unmapped user<br \/>\naddresses return -EFAULT.<\/p>\n<p>[shorne@gmail.com: fix comment style]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>openrisc: fix arbitrary kernel memory access via or1k_atomic syscall<\/p>\n<p>sys_or1k_atomic() (syscall 244 in the &#8220;or1k&#8221; ABI) takes two u<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21411","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21411","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=21411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}