In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: fix use-after-free in smc_rx_pipe_buf_release()<\/p>\n
smc_rx_splice() hands RMB pages to a pipe and takes a socket reference
\nper entry so the smc_sock stays alive until the reader finishes. The
\nconnection does not: a concurrent close runs smc_conn_free(), which
\nreleases the receive buffer back to the link group pool.<\/p>\n
smc_rx_pipe_buf_release() tests sk_state before taking the socket lock.
\nThe state can change between the test and the lock, and
\nsmc_rx_update_cons() then dereferences conn->rmb_desc and walks
\nconn->lgr, which smc_conn_free() has already released. On the
\nis_reg_err path smcr_buf_unuse() frees the descriptor outright, so
\nthis is a use-after-free.<\/p>\n
Take the socket lock first and test conn->freed instead.
\nsmc_conn_free() sets that flag before releasing anything, and every
\ncaller holds the socket lock. The two paths exclude each other: either
\nthe pipe release runs first with everything valid, or it sees the flag
\nand skips the update.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: fix use-after-free in smc_rx_pipe_buf_release()<\/p>\n
smc_rx_splice() hands RMB pages to a pipe and takes a socket reference
\npe<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21315","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21315","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=21315"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21315"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}