In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2<\/p>\n
When a valid primary TRANSACT2 response has been received (mid->resp_buf
\nset, mid->multiRsp true) and a subsequent secondary response causes
\ncifs_check_trans2() to return false — either because the SMB header is
\ninvalid (malformed != 0) or because check2ndT2() rejects the PDU —
\nhandle_mid() overwrites mid->resp_buf with the new buffer (leaking the
\nprimary buffer) and, because mid->multiRsp is set, skips the
\nserver->smallbuf\/bigbuf NULL-out. When the user thread frees
\nmid->resp_buf, server->smallbuf or server->bigbuf is left dangling; the
\ndemux thread reuses it for the next packet, resulting in a use-after-free.<\/p>\n
Combine both early-exit conditions and, when mid->multiRsp is already
\nset, abort the pending transaction inline: set multiEnd, call
\ndequeue_mid() with malformed=true, and return true so handle_mid() exits
\nwithout touching mid->resp_buf or the server buffer pointers.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2<\/p>\n
When a valid primary TRANSACT2 response has<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21559","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21559","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=21559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}