In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU<\/p>\n
nvmet_tcp_try_recv_pdu() reads a PDU header into the fixed 128-byte
\nqueue->pdu union, then computes the remaining payload length as<\/p>\n
\tqueue->left = hdr->hlen – queue->offset + hdgst;<\/p>\n
and reads that many more bytes into &queue->pdu + queue->offset, without
\never bounding the result against sizeof(queue->pdu).<\/p>\n
A struct nvme_tcp_icreq_pdu is itself 128 bytes, exactly the size of the
\nunion. Once a header digest has been negotiated (hdgst = 4), a second
\nICReq passes the hlen == nvmet_tcp_pdu_size() check but yields
\nqueue->left = 128 – 8 + 4 = 124, so bytes 8..132 are written into the
\n128-byte buffer — 4 bytes past its end, over queue->hdr_digest and
\nqueue->data_digest. Those bytes are attacker-controlled (an ICReq
\ncarries no digest), and the duplicate ICReq is only rejected later,
\nafter the overflow. A remote unauthenticated host can thus corrupt
\nkernel memory adjacent to the receive buffer.<\/p>\n
Reject any PDU whose declared length would read past the end of
\nqueue->pdu before the second recv.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU<\/p>\n
nvmet_tcp_try_recv_pdu() reads a PDU header into the fixed 128-<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24656","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24656","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=24656"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24656"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24656"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}