{"id":21288,"date":"2026-09-12T04:30:59","date_gmt":"2026-09-11T20:30:59","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80955"},"modified":"2026-09-12T04:30:59","modified_gmt":"2026-09-11T20:30:59","slug":"cve-2026-80955","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80955","title":{"rendered":"CVE-2026-80955 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: fix use-af"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>dm-pcache: fix use-after-free and invalid seg operations in kset_replay()<\/p>\n<p>In kset_replay, when key-&gt;seg_gen is stale (key-&gt;seg_gen cache_pos.cache_seg-&gt;gen), cache_key_put(key) is called but then<br \/>\nkey-&gt;cache_pos.cache_seg is accessed as the argument to cache_seg_get().<br \/>\nThis is a use-after-free on the freed key memory. Although mempool<br \/>\nrecycled memory is not immediately reclaimed or overwritten in practice,<br \/>\nthis is still a potential UAF bug.<\/p>\n<p>Additionally, for expired invalid keys, setting the cache-&gt;seg_map bit<br \/>\nand calling cache_seg_get() is unreasonable since the corresponding<br \/>\nsegment data is no longer valid.<\/p>\n<p>Fix both issues by moving cache_seg_get() and __set_bit() after the<br \/>\ngen check, so they only execute for valid keys, and using continue to<br \/>\nskip invalid keys.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>dm-pcache: fix use-after-free and invalid seg operations in kset_replay()<\/p>\n<p>In kset_replay, when key-&gt;seg_gen is stale (key-&gt;seg_gen<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21288","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21288","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=21288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}