{"id":"AZL-101600","summary":"CVE-2026-89969 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: fix out-of-bounds write when receiving an over-long PDU\n\nnvmet_tcp_try_recv_pdu() reads a PDU header into the fixed 128-byte\nqueue-\u003epdu union, then computes the remaining payload length as\n\n\tqueue-\u003eleft = hdr-\u003ehlen - queue-\u003eoffset + hdgst;\n\nand reads that many more bytes into &queue-\u003epdu + queue-\u003eoffset, without\never bounding the result against sizeof(queue-\u003epdu).\n\nA 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-\u003eleft = 128 - 8 + 4 = 124, so bytes 8..132 are written into the\n128-byte buffer -- 4 bytes past its end, over queue-\u003ehdr_digest and\nqueue-\u003edata_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.\n\nReject any PDU whose declared length would read past the end of\nqueue-\u003epdu before the second recv.","modified":"2026-09-17T14:15:52.885389506Z","published":"2026-09-16T11:17:07Z","upstream":["CVE-2026-89969"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89969"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-101600.json"}}],"schema_version":"1.9.0"}