{"id":21294,"date":"2026-09-12T04:30:59","date_gmt":"2026-09-11T20:30:59","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80961"},"modified":"2026-09-12T04:30:59","modified_gmt":"2026-09-11T20:30:59","slug":"cve-2026-80961","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80961","title":{"rendered":"CVE-2026-80961 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate k"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>dm-pcache: validate kset key_num and intra-segment bounds<\/p>\n<p>Two more fields decoded from the cache device go unbounded. The kset<br \/>\nkey_num drives cache_kset_crc() and the replay loop in cache_replay(),<br \/>\nthe writeback worker and the GC worker, but only the magic and a<br \/>\nfixed-seed CRC are checked first, so a non-last kset whose key_num exceeds<br \/>\nthe PCACHE_KSET_KEYS_MAX buffer reads past its end before the CRC compare.<br \/>\nA key&#8217;s intra-segment offset and length in cache_key_decode() are taken<br \/>\nverbatim, so a key running past its segment is replayed into the cache<br \/>\ntree and the data CRC check and every later read hit then copy adjacent<br \/>\npersistent memory into the caller&#8217;s bio &#8212; an out-of-bounds read that<br \/>\nleaks to user space. Both fields are controlled by whoever supplies the<br \/>\ncache device (CAP_SYS_ADMIN); the CRC seed is public.<\/p>\n<p>Add kset_onmedia_valid() to bound key_num before any kset read, and<br \/>\nreject a key whose offset plus length, computed in 64 bits, exceeds the<br \/>\nsegment data_size. Valid metadata is unaffected.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>dm-pcache: validate kset key_num and intra-segment bounds<\/p>\n<p>Two more fields decoded from the cache device go unbounded. The kset<br \/>\nkey<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21294","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21294","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=21294"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21294"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}